Goldschmidt2022

Understanding the processes by which rocky planetary bodies differentiated into a core, mantle, and crust, and how their resulting attributes influenced subsequent geologic events and atmospheric compositions is crucial to understanding the evolution of solar systems. The aim of this session is to bring together diverse perspectives from the various avenues of experimental petrology-centric research within the overarching field of planetary sciences, in order to spark big picture and interdisciplinary discussions. Therefore, we encourage submissions from all areas of experimental studies including surface, mantle, and core conditions and geochemical studies of achondrites to understand the formation and evolution of rocky bodies within or outside of our Solar System. In addition, we encourage the submission of abstracts that include methods to increase the inclusion, diversity, equity, and accessibility of the field of experimental petrology as a whole. We welcome abstracts that examine the diversity, accessibility, and scientific outcomes of experimental studies investigating 1) primary differentiation processes of rocky planetary bodies, 2) primary geochemical aspects of planetary bodies such as primary crust, mantle, and core compositions, 3) secondary processes that influence the petrological evolution of bodies in our Solar System and beyond. Studies implementing advances in experimental techniques are also welcome.

If you are interested in exploring IDEA efforts further, be sure to check out the DEI program events.

If you are interested in exploring IDEA efforts further, be sure to check out the DEI program events.

Hayabusa2 has returned samples from C-type near-Earth asteroid (162173) Ryugu in December 2020. The analysis of these samples will reveal the nature and history of Ryugu, the composition of C-type asteroids, and the relationship of Ryugu samples to the known meteorites. Findings from the analysis of Ryugu samples and previous cometary sample return will invoke cosmochemical discussion on the origin and evolution of the Solar System, such as the isotopic dichotomy in the Sun's protoplanetary disk, the delivery of water and organics to dry rocky planets, and the asteroid-comet continuum. Samples from (101955) Bennu, which will be returned in September of 2023, will also contribute in a complementary fashion to those from Ryugu, thus advancing our understanding of the early Solar System even further. In this session, we welcome contributions highlighting recent results from the analysis of Ryugu samples and related extraterrestrial materials originating from small bodies. Contributions dedicated to analytical developments, space exploration, cosmochemical/astrophysical modeling, and experimental approaches to understand small bodies and the early Solar System are also welcome.

Evidence gathered from orbital and in situ missions and martian meteorites increasingly points to a warmer and wetter early Mars, implying a planetary history that diverged from a climate similar to the early Earth to become the cold and dry Mars that we find today. Geomorphological evidence for Mars' watery past includes outflow channels, river valley networks and deltas. Recent rover missions, including NASA’s Curiosity and Perseverance rovers, are providing a smorgasbord of new, in-situ observations of elemental abundances and mineral associations that point toward a significant role for water in the evolution of Mars surface geochemistry. Martian meteorites are revealing the chemical and isotopic signatures of Mars’s past volatile cycles. The conveners of this session invite contributions focusing on the interplay between water and the Martian surface. We particularly invite contributions related to the detection of rocks and minerals on the surface or meteorite samples that could have been formed in, or altered by, liquid martian water, and studies elucidating the habitability of past aqueous environments on early Mars.

Planetary surfaces, mantles, and possibly cores are major reservoirs for volatile elements (i.e., elements with a strong affinity for the gas phase such as H, C, N, S, noble gases and the halogens). This session aims at identifying the concentration and isotopic composition of these elements in planetary reservoirs and how and when such volatile budgets were set in the terrestrial planets. The initial volatile budgets in distinct reservoirs and how they evolved in time has important implications for understanding the genesis and evolution of Earth and other planetary bodies, including the Moon and the inner Solar System planetary suite. This, however, requires the reconstruction of 4.5 Gyr of geological processes involving volatiles. These processes include the early and late planetary accretion and differentiation, magma ocean evolution and outgassing, atmospheric losses, and deep volatile cycles associated with the various styles of mantle convection and lithospheric recycling. To this end, we invite contributions from all domains of planetary sciences, including, but not limited to, analytical geochemistry, experimental petrology, numerical modeling, and remote observations, applied to Earth, other terrestrial planets in our Solar System, or exoplanets. Submissions from early career scientists and underrepresented groups are strongly encouraged.

Experimentally measured and theoretically predicted elastic and transport properties of planetary materials are fundamental to understand the physics, chemistry, and evolution of the Earth and other planetary bodies. The precise determination of the pressure, temperature, and compositional dependence of the elastic properties of mantle and core materials is needed to interpret thermochemical heterogeneities in the Earth’s interior revealed by geophysical observations, and more generally, to elucidate the structure of other planetary bodies. The measurement or computation of transport properties, such as viscosity, thermal and electrical conductivity, and diffusivity, is required to understand and model the mass and heat flows in terrestrial mantles and cores, as well as the generation and sustainability of an intrinsic magnetic field in a planet or moon. This session provides a platform to present novel results and technical developments from experimental and computational mineral physics investigations. We also encourage interdisciplinary studies that combine experiments, theoretical predictions, and numerical modeling with geophysical and geochemical observations.

The accretion, differentiation and reshaping of the Earth are intimately linked to melting processes. Volatiles play a critical role in influencing the style, location and degree of melting, as well as the stabilization of melts, in the Earth’s interior, which in turn affect many fundamental aspects and dynamics of the Earth including even the formation of volcanism from small petitspots to large igneous provinces. Melting is greatly regulated by the species and amounts of volatiles. Much attention has been focused to the possible role of hydrogen and carbon, however, many relevant issues remain ambiguous, poorly quantified and even controversial. Moreover, the effect of other volatiles (e.g., nitrogen, sulfur and halogens) on Earth’s deep melting has not been well documented.

The aim of this session is to bring together researchers investigating various aspects of volatiles and melting in the Earth’s interior, from the crust to core, from the ancient past to moden periods and from the laboratory to field. We welcome contributions including, but are not limited to, field observations, experimental studies and theoretical modeling. Interdisciplinary contributions are especially encouraged.

The geochemical state of the Earth’s mantle and core is primarily controlled by the nature of its ancestral building blocks, accretion and differentiation in the Early Solar System, as well as subsequent evolution processes, such as subduction, mantle convection and core crystallization, that operated over longer timescales. Elemental and isotopic analysis of mantle-derived magmas and rocks at macro and micro scales represent a major way to probe into the Earth’s deep interior. Experimental studies help understand the behavior of elements and mass-dependent isotope fractionation under various P-T conditions of planetary differentiation processes, providing support for interpreting these sample-based measurements. In addition, first-principles calculations and numerical modeling bring insightful constraints, especially for extreme conditions and large-scale processes that are hard to achieve by experiments.

This session aims to bring together sample-based, experimental, and theoretical studies on the evolution of elemental and isotopic compositions of the Earth’s mantle and core following its formation, early differentiation, and evolution. Under this scope we welcome contributions including but not limited to (1) elemental and stable isotope analyses of mantle-derived rocks (e.g., xenoliths, ultramafic massifs) and magmas (e.g., basalts, picrites, komatiites, kimberlites, boninites), extraterrestrial samples that simulate the precursor materials of Earth, as well as their minerals and mineral-hosted inclusions ; (2) experiments and first-principles calculations that focus on understanding the behavior of elements and mass-dependent fractionation of their isotopes during planetary differentiation and evolution; and (3) numerical simulations based on observed elemental and isotopic compositions of the Earth’s mantle and core.

Foundational events in Earth’s accretion and differentiation history can be investigated through geochemical investigations of samples from Earth’s deep interior. For example, study of Earth’s mantle by analysis of volcanic rocks and xenoliths has the potential to unlock information about its ancient past, including accretion, crust and continent formation, evolution of mantle composition, onset of subduction, and spatiotemporal scales of mixing that led to the deep Earth heterogeneity. Measurement of the mass-independent isotopic compositions of primitive terrestrial samples, as well as nucleosynthetic heterogeneities found in some extraterrestrial materials, provide critical constraints on the initial composition of the Earth. These observations can be tested further with seismic and dynamic studies. This session focuses on the observational insights provided by geochemical and isotopic (including short-lived, traditional radiogenic and non-traditional stable isotopic systems including nucleosynthetic component indicators) in a variety of materials that range from intraplate and oceanic island basalts, mantle xenoliths, lithospheric magmas, and meteorites. Parallel studies providing constraints on these observations from seismology and geodynamics are also welcomed in order to together provide a perspective into the scale, extent, and origins of deep Earth geochemical heterogeneity in the past and present.

The lithosphere is the solid outer layer of our planet, fragmented into the many tectonic plates that interface between the hydro/biosphere and Earth’s deep interior. The lithospheric mantle plays a critical role in the formation and stability of the lithosphere and informs our understanding of global mantle differentiation and global cycles of important elements such as carbon. This session welcomes contributions that further our understanding of processes that formed and modified the Earth’s continental and oceanic lithospheric mantle through time, including on- and off-cratonic settings, volcanic provinces or large igneous provinces. We also welcome contributions from present-day mid-ocean ridges, oceanic plateaus, ocean islands, and their analogues from ophiolitic belts, etc. We encourage studies that will address questions such as:

1. what mechanisms form, preserve and destroy the lithospheric mantle?
2. how is the lithospheric mantle related to the overlying crust?
3. how do the composition, temperature, and structure of the lithospheric mantle evolve with time?
4. how does the storage of volatile elements in the lithospheric mantle affect the stability of the overall lithosphere?

We invite researchers from the fields of geochemistry, petrology, experimental petrology, geophysics and numerical modelling that study these processes at the sub-micron, regional scale and global scale.

Plate tectonics was brilliantly established as a unifying theory fifty years' ago, and acts as first-order controls for many mineral deposits. However, three main issues are still a matter of strong debate within the scientific community, namely (1) the origin of plate tectonics, (2) intraplate deformation and (3) plate driving forces. In recent years, some small micro-plates have been reported and gradually become research frontiers. This is due to the fact that any plate has a growth process from small to large and micro-plates are probably the precursors of large-scale plates. Thus, a better understanding of the origin, growth and extinction of plates are of great significance for studying onset and evolution of plate tectonics, as well as the genesis of mineral deposits. This session focuses on current research progress and trends on tectonics and the related mineralization. We welcome presentations that cover tectonics, petrology, isotopic geochemistry and mineral deposit studies particularly those which help in those understanding micro-plate-linked or tectonically-controlled mineralization.

The origin and evolution of Earth’s crust-mantle system remains a hotly debated topic by geoscientists. Earth’s surface is continually modified by tectonics, leaving few remaining well-preserved Archean rocks available to study crustal evolution processes since the Hadean. As a result, several first-order questions persist. How and when was the first felsic crust made and stabilized? When did Earth’s depleted mantle reservoir form? When did a global system of tectonic plates begin to operate on Earth? What processes modified the early lithosphere before the advent of plate tectonics? Advances in geochemical techniques along with developments in novel isotope systems have rapidly changed our understanding of how Earth’s crust-mantle system has evolved over geologic time. A better understanding of the geochemical evolution of the crust and mantle is critical for the development of new models focusing on the evolution of the geosphere, but also the hydrosphere, atmosphere, and biosphere. We invite contributions that use geochemical, petrologic, and geodynamic approaches to address fundamental questions regarding crust formation and evolution, from the Hadean to present.

Igneous, metamorphic, and sedimentary rocks reflect chemical and physical processes that have changed Earth’s continental lithosphere through time. The nature of these changes and their relationship to Earth’s evolving tectonic system and surface environment (including atmosphere, hydrosphere, and biosphere) is an exciting area of active debate. How has the nature of continental crust formation, magma generation, metamorphism, and associated mineral-scale processes changed through time? How are these expressed as punctuated (e.g., Archean-Proterozoic boundary) vs. more gradual changes? How do these changes reflect geodynamic evolution, and do these correlate with the processes governing Earth’s surface environment? When did "modern-style" plate tectonics begin, and how has it changed through time? If not "modern" plate tectonics, what tectonic modes might have been important in Earth’s past? We invite submissions with a wide range of approaches using the rock record – with an emphasis on interdisciplinary studies – to evaluate secular changes in Earth’s systems.

In recent years, and thanks to improved analytical capabilities, heavy stable isotopes (e.g., Mg, Fe, Se, Ti, Zr, Mo) have emerged as powerful new windows into high-temperature geochemical processes. Isotope ratios that were once considered invariant now reveal permil to sub-permil variations that allow us to study diverse problems ranging from core formation to mantle and crust evolution as well as subduction recycling. Some heavy stable isotopes are also sensitive to changing redox conditions at the surface through geological time and may offer unique insights into Earth’s coupled endogenic and exogenic evolution into a habitable system.

In this session, we invite submissions focusing on emerging and more mature “non-traditional” isotope systems that: (1) contribute to our basic understanding of these systems (e.g., constraining modern global cycles, understanding isotopic fractionations, theoretical systematics), (2) make use of these proxies to address first-order scientific questions regarding the evolution of Earth’s lithosphere. We welcome studies exploring the full range of temporal and/or length-scales - from Hadean to modern; from micron size systems (single-crystals and below) to global reservoirs - where the stable isotope chemistry of heavy elements are now being used.

Large Igneous Provinces (LIPs) consist of large volume (>0.1 million km³; frequently above 1 million km³) mafic to ultramafic as well as silicic magmatic events of intraplate affinity that occur in both continental and oceanic settings. LIPs contribute significantly to the break-up of the continents/supercontinents, catastrophic environmental changes leading to global mass extinctions. There are strong links between LIPs and ore deposits. Large layered mafic-ultramafic intrusions typically host Cu-Ni-PGE–rich sulfides, chromite, and Fe-Ti-V oxides deposits. Basaltic and gabbroic rocks and Archean komatiites host Cu-Ni sulfides deposits. Iron-Oxide Copper-Gold (IOCG), and Sn, W, U, Nb, Ta, and Th mineralization are often associated with A-type granites. Extensive epithermal Au-Ag mineralization can be developed within the silicic large igneous provinces. Mineralogically and compositionally diverse alkaline rocks (such as kimberlites, lamproites, lamprophyres, nepheline syenites associated with carbonatites, peralkaline syenites, etc.) constitute an important component of many LIPs and at times can host significant deposits of diamonds, rare earth elements (REEs), high field strength elements (HFSEs), apatite, etc. Although silicic and alkaline rocks are volumetrically minor compared to mafic igneous rocks of the LIPs, the concentration of economic and strategic minerals are higher in these rocks which makes an understanding of the genesis of such rocks associated with LIPs significant. In this session, we welcome contributions that address problems related to the classification, geochronology, petrogenesis, and geodynamics of the alkaline igneous rocks associated with various LIPs through the geological time with special emphasis on their economic aspects.

This session calls for contributions dealing with metamorphic processes in orogenic belts with a special focus on high-pressure/ultrahigh-pressure and high-temperature/ultrahigh-temperature environments. We invite submissions that address a range of approaches and problems in those settings including geochemical cycling, physico-chemical interactions between different rock types, the nature of metamorphic fluids, geochronological constraints on metamorphic processes, exhumation mechanisms, timescales of metamorphic processes, the thermal conditions of metamorphism, the changing nature of these environments over geologic time, and trace element behavior in these settings. We welcome field-based, analytical, experimental, and modeling studies, as well as multidisciplinary efforts that integrate across research areas.

Available geochronological data imply that supercontinents older than the Pangea existed in the geological past. The crustal blocks within the Pangea are correlated from paleontological, paleomagnetic, and geochronological data. Immediate older to the Pangea is the Gondwanaland supercontinent. Gondwanaland includes cratonic blocks of India, Africa, South America, Australia, and Antarctica. The high-grade Pan-African orogenic belts that stitch the western and eastern Gondwanaland developed due to subduction-driven tectonics, granite magmatism, and granulite facies metamorphism between 650 to 500 Ma. The East European cratonic blocks experience granite magmatism and high-grade metamorphism during Cadomian orogeny in a similar time frame. However, the correlation between crustal blocks in Gondwanaland and the East European cratons is disputed due to the lack of paleontological and paleomagnetic data.

As the geochemical, thermal, and chronological evolution of magmatic-metamorphic rocks in different cratonic blocks can be established by combining the results of geochemical analysis, isotope tracers and, thermodynamic modeling, we seek out submissions that deal with a) geochemical and isotopic composition of rocks from Gondwanaland and East European cratons, b) phase-equilibria modeling of temporally coeval magmatic and metamorphic rocks from both crustal domains, c) mineral-melt mass balance accommodated numerical simulation including petrological experimental results and, d) whole-rock and mineral isotope geochronology to investigate the possible tectonic link between the Gondwanaland and the EastEuropean cratons. The outcome of this session will help to comprehend the coeval tectonic and thermal evolution of the traditional Gondwanaland and East European cratons and provide an acid test for the existence of northern Gondwanaland.

Fluids and fluid-rock interactions are fundamental to our understanding of Earth-scale processes with implications for rheology, heat and mass transfer, magmatism, seismicity, and elemental and volatile cycling. Fluid-rock interactions operate at various length-scales across different geodynamic settings, particularly in oceanic ridges, transform boundaries, passive margins, and subduction zones. However, our understanding of the nature, styles, and durations of fluid-rock interactions is complicated by the complex pressure-temperature, deformation, and fluid alteration histories recorded by the rocks. A multidisciplinary approach is thus needed to advance our understanding of fluid-rock interactions and their rheological and geochemical consequences. In this session, we aim to bring together expertise from a wide range of disciplines to tackle various questions of fluid-rock interactions from low to high-pressure and temperature conditions. Examples include feedback between alteration and deformation in oceanic lithosphere, fluid fluxes and seismicity in subduction interface, etc. We invite contributions from petrology and geochemistry of natural rocks, laboratory hydrothermal experiments, thermodynamic phase equilibria, reaction-path, and reactive-transport models, as well as studies on rock mechanics, seismology, and numerical models. Interdisciplinary contributions are especially encouraged.

Investigating the kinetics of mineral and melt reactions (crystal nucleation, growth, dissolution, recrystallization, diffusive re-equilibration) is key to exploring the dynamics and timescales of igneous and metamorphic processes in Earth’s crust. The latter are not only controlled by the prevailing physicochemical boundary conditions (e.g., pressure, temperature, oxygen and volatile fugacities), but also by the characteristics of the geomaterials in question (minerals, melts, fluids). Integrating studies that investigate the properties of geomaterials (e.g. bulk, melt and mineral compositions, viscosity, solubilities, element diffusivities) with research on thermobarometry, phase equilibria and kinetics will advance our understanding of crustal-scale magma storage, evolution and ascent/eruption, tectonic processes and P-T-t paths of metamorphic rocks, ore-forming processes and fluid-rock interactions.

This session brings together studies that explore: mineral reaction textures and zoning as records of the conditions of high-temperature processes; kinetics of crystal nucleation, growth, recrystallization, re-equilibration, and dissolution in igneous and metamorphic systems; diffusion chronometry and thermodynamic modelling to evaluate time scales and conditions of geological processes; geochronology based on absolute age determinations; the role of fluids and volatiles on reaction rates and phase equilibria; state-of-the-art experimental and analytical approaches to investigate reaction kinetics relevant to minerals, melts, glasses, and fluids.

Chalcophile (S, Cu, Ni, As, Se, Ag, Te, Sn, Sb, Bi, Tl, and Pb) and highly siderophile elements (Os, Ir, Ru, Pt, Rh, Pd, Re, and Au) strongly fractionate in both magmatic and hydrothermal processes leading to formation of different types of ores. Economically valuable mineral deposits are often controlled by the volatile species in magmas and fluids (e.g., H₂O, CO₂, SO₂, and Cl). The sequestration of metals and volatiles between minerals, melts, and exsolved magmatic fluids influences the tendency of magmatic systems to form ore deposits. The partitioning of metal and volatile elements between silicate melts, minerals, and fluids strongly depends on intensive parameters such as temperature, pressure, oxygen and sulfur fugacities, as well as the composition of melt, fluid, and sulfide phases, all of which may change significantly during the evolution of magmatic-hydrothermal systems. Hence, the partitioning behavior varies in different tectonic settings such as mid-ocean ridges, oceanic islands, subduction zones, flood basalt provinces, and continental rift zones, leading to differences in metallogenic processes and ore type.

Furthering our understanding of the metal speciation and partitioning behavior has the potential for new insights into large-scale geodynamic processes and the concentration of strategic metals at a local scale. We thus welcome contributions including field and petrological observations, experimental petrology, numerical modeling, economic geology, and planetary geology to address the abundance, distribution, as well as elemental and isotopic fractionation of volatiles, chalcophile and siderophile elements between different phases in various tectonic settings and their implications for ore forming processes.

Magmatism in the oceanic crust represents one of the main outcomes of mantle geodynamics at the surface of our planet. The composition of the erupted magmas depends not only on the conditions of mantle melting and the composition of the source components, but also on petrogenetic processes experienced by melts during differentiation in igneous reservoirs. If we are to fully comprehend the geochemical evolution of these oceanic magmas, we need to understand the ages, timings, and geochemical and petrological origins of volcanic and hydrothermal deposits found on the seafloor and elsewhere. We wish to address various aspects of the magmatism within oceanic plates, from the characteristics of mantle melting, through the mantle-crust transition, and to the formation and evolution of crustal reservoirs, including the interplay between magmatism, tectonic deformation and hydrothermal alteration. Observing, sampling, and monitoring hydrothermal and magmatic activity in these environments remains a challenge, but technological advancements, modelling, and increased seafloor-surveying capabilities are improving our scientific efforts.  The session calls for contributions using mineralogical, petrographic and geochemical approaches, and associated datasets, to unlock the history of oceanic magmatism. We also welcome contributions based on experimental or numerical modelling of magmatic systems that help constrain the formation of oceanic crust and development of magmatic systems.

Fred Frey passed away on September 13^th, 2021 after a long battle with Parkinson’s Disease. This session honors his contributions to modern geochemistry, and in particular to his over 50 year’s extensive application of geochemistry to understand the magmatic processes that produce the Earth’s volcanoes. Fred was instrumental, along with others, in defining and reshaping the now-mature subdiscipline of trace element geochemistry. His pioneering work using neutron activation analysis for accurate and precise determination of trace element compositions in rocks, together with isotope geochemistry, field geology and petrology, significantly improved our understanding of the roles of source, partial melting, and magmatic differentiation and evolution leading to volcanism at mid-ocean ridges, converging boundaries, and intra-plate settings. These processes are important for differentiating the Earth, modifying the Earth’s surface, and affecting the environment. Fred was a practitioner of diversity and inclusivity before it became the current emphasis, as evidenced by his many students from groups underrepresented in STEM, many of whom have gone on to highly successful careers in geology. Fred was a longstanding member and fellow of the Geochemical Society, President of the Volcanology, Geochemistry and Petrology Section of the American Geophysical Union, and an Associate Editor of Geochimica et Cosmochimica Acta for over 20 years. In this session, we invite contributions that use geochemical, isotopic, petrologic and field approaches to understand the volcanoes from all tectonic environments.

Understanding the physical and chemical properties of magma bodies in the crust informs the characterization of eruption styles and assessment of their associated volcanic hazards. A wide range of processes, such as magma crystallization, vesiculation, outgassing, magma mingling, cooling, and decompression, influence ascent dynamics that ultimately affect the resulting eruptive style.

Some questions relevant to this area of research include: How do magmas change petrologically, rheologically, and physically during storage and how do they change syn-eruptively? Where and how do magmas interact with each other and the surrounding crust? How do different magmatic plumbing systems geometries develop?

This session focuses on the chemical and physical characteristics of magma bodies and conduit systems through studies that utilize field, analytical, ex-situ and in-situ real-time experiments, and/or numerical modeling methodologies. We particularly invite contributions that invoke interdisciplinary approaches and innovative methodologies that illuminate the development and evolution of magmatic systems in disequilibrium conditions. Constraining disequilibrium in magmatic systems is fundamental to quantify the timescales of volcanic processes at syn-eruptive conditions. We also encourage studies that highlight the effects of syn-eruptive processes on the modulation of eruptive styles, and how improved knowledge adds societal support for fast response to rapidly evolving geological processes and volcanic hazards.

The timescale of magma formation, storage and ascent beneath active volcanoes is crucial to constrain the magma chamber dynamics and provide the basis for volcanic hazard assessment. Despite an increasingly large body of geophysical information on magma migration and accumulation within magma plumbing systems, there are currently no integrated views on how mush-dominated magma plumbing systems evolve in space and time, how magma is stored, transferred and processed within these systems and how mush processes affect the behaviour, duration and intensity of volcanic eruptions. Thus, understanding the dynamics of mush-to-magma conversion is not only important for describing the physical evolution of magma plumbing systems, but is also vital for carrying out effective volcano monitoring and risk assessment. Beside crystal formation, dissolution and reaction of pre-existing crystals are processes that commonly affect the kinetics of magma crystallization and that, however, are constrained from the theoretical and the experimental point of view only in outline.
In this session, we welcome mineralogical, petrological, and geochemical contributions that provide insights on how magma dynamics studied either in the laboratory or in nature can ultimately affect the volcanic rocks in terms of kinetic processes, crystal-melt-liquid element partitioning, major, trace element and isotopic compositional changes of minerals/glasses/bulk rocks, magma mixing and contamination phenomena during storage, differentiation and ascent of magmas. We also welcome contributions that use the physical and chemical properties of volcanic eruption products, and those of crystals in particular, to improve our understanding of mush-bearing magma plumbing systems.

To capture and describe the geochemical evolution of magmatic systems we require analytical, experimental, and numerical advances involving cross-disciplinary investigations in geochemistry, petrology, volcanology, and numerical modeling. New developments in topics such as mineral-melt partitioning, volatile behavior, and crystal growth, lead to wide-ranging questions regarding magma generation and ascent. What controls spatial and temporal variations in the genesis of primary magmas, their initial compositional variations, and their modification by crustal processing? How do magmas move, through percolation or fracture propagation? What are the rates of magma ascent? How do melts avoid trapping by ductile upper crustal mush zones? Are crystals dominantly of antecrystic origin? Do magmatic volatiles drive magma ascent, and to what degree do they influence ascent rates? We invite studies from all tectonic settings (ocean ridges, ocean islands, subduction zones, back-arc basins, petit-spots, intracontinental rifts, monogenetic volcanic fields), focusing on geochemical recorders of magmatic histories. Approaches may include analysis of crystals, melts, and melt inclusions, or other novel techniques.

The session seeks to highlight advances in understanding Large Igneous Provinces (LIPs, sensu lato, i.e. including SLIPs) and their link and consequences on mineral deposit formation, global climate, and biosphere, through chemical and physical processes in crust-mantle system, mantle source heterogeneity, emplacement histories, supercontinent cycles, and gas release through volcanism and hydrothermal alteration via the intrusive component. We invite presentations from scientists across all career levels.

Perspectives

LIPs are voluminous emplacements of petrogenetically-related mainly mafic and typically more minor ultramafic and silicic volcanic and plutonic rocks that usually form within a geologically short time window (≤10 Ma), though long-lived LIPs are also reported. Silicic LIPs (SLIPs) refer to those dominated by silicic units. In general, LIPs are considered to be caused by either deep-seated mantle plume upwelling or melting in the shallow mantle related to plate processes. Decades of research have recognized each LIP exhibits unique compositions, durations of magmatism, magma production and effusion rates and has profound effects on atmosphere and ocean. These challenges call for a multidisciplinary approach including new results focusing on:

• Mineralogy, petrology, geochemistry of LIP rocks and deposits
• Stratigraphy, timing and duration of LIP events, geodynamic simulations
• Effects of LIP magmatism on climate, ocean chemistry and biosphere

The recent eruptions at Kīlauea (HI, USA), Fagradalsfjall (Iceland) and Cumbre Vieja (La Palma, Canary Islands) have provided prolonged and unprecedented opportunities for close scrutiny of spectacular basaltic volcanic eruptions exhibiting a range of styles. The eruptions have produced rich and detailed volcano monitoring datasets across a range of disciplines, including petrology, field geology, geophysics, geodesy, and remote sensing. Many new observations have been made possible by emerging technology, including unoccupied aerial vehicles, low-cost sensor networks, soil and plume geochemistry, and high precision satellites. The eruptions have had serious and detrimental impacts on surrounding populations and on the environment; yet the eruptions have also been a spectacle, providing a boost for tourism in some cases. We welcome broad and interdisciplinary contributions presenting observations and models relating to the 2018-2021 eruptions of Kīlauea, the 2021 Fagradalsfjall eruption and the 2021 Cumbre Vieja eruption that highlight advancements in our understanding of the magma plumbing systems, eruption processes, hazard assessments and eruption forecasting, and the environmental and social impacts of the eruptions. Besides ongoing research in volcanoes, this session also discusses how pre-scientific cultures reacted to volcanic phenomena by incorporating them into their legends and myths and passed on through oral and written tradition. This ancestral knowledge has significantly augmented the geological record of the eruptive history of a volcano. Thus, we encourage researchers to also share their knowledge of ancient interpretations that influenced their scientific studies, as well as their experiences doing research and fieldwork within sacred lands.

Volatile species are relatively minor constituents of magmas, yet have great importance for magma dynamics, migration, eruption impacts and the transport and deposition of volatile metals. Volatiles influence magma properties such as density, compressibility and viscosity, which in turn control magma storage, transport and dynamics, as well as eruption triggering and style. Carbon in particular has played a prominent role in planetary evolution, controlling many aspects of our livable planet. Most of the Earth’s carbon may stay deep in the Earth and is recycled through subduction, released in the mantle by fluids and melts that migrate upward, and ultimately degassed in the atmosphere. The forms and processes of carbon ingassing (via subduction into deep Earth) and outgassing (e.g., volcanism and diffuse soil emissions) are crucial to gain insights into the dynamics of carbon transfer from the deep Earth. This session spans a range of disciplines covering the study of volatiles and fluids in the Earth, including the characterization of deep carbon reservoirs, diamond formation, volatile and fluid transport and outgassing processes, pre- and syn-eruptive volcanic gas behavior, volcanic plume dispersal, and environmental effects of volcanic gases.

Much of our geoscience knowledge is underpinned by isotopic data. Recent technological advances have enhanced understanding of important geoscience questions, including the timing of terrestrial planet evolution, the conditions of biologic activity, the durations of volcanic eruptions. In addition to instrument advances, new sample treatments and introduction techniques, clean lab protocols, data reduction strategies, and the development of new standards, have improved precision and accuracy. In this session, we invite contributions on new approaches to the collection of isotopic data; this includes new and/or modified mass spectrometer designs, data reduction strategies, sample preparation techniques, or introduction procedures. We particularly encourage contributions from junior researchers and those from traditionally underrepresented groups. Additionally, we encourage submissions of null or unexpected results that enhance understanding of the field. As such, we are particularly interested in contributions that showcase ‘work in progress’ where the outcomes are not yet clear.

Observational and experimental investigations have significantly advanced our understanding of the Earth’s surface and interior processes. Geochemical data of the atmosphere, hydrosphere, and lithosphere have been collected and accumulated over centuries, the public access to which has been largely improved in the past decades. Combined with the recent developments in advanced mathematical algorithms and powerful computation capacity, they enable the discovery of information hidden in geochemical data, enhancing our understanding of the mechanism of the Earth system. This session invites researchers with a broad range of expertise interested in data-driven approaches to answer unresolved Earth science problems. We welcome contributions including but not limited to compositional data analysis, graphical analysis, machine learning techniques, and cyberinfrastructure development. We encourage submissions using both the full range and a subset of atmospheric, hydrological, sedimentary, mineralogical, and petrological geochemistry data.

Stable isotopes have been valuable tools in studying geobiology and biogeochemical cycles in the present and past. Recent development of ways to measure abundances of doubly-substituted isotopologues (clumped isotopes) of molecules such as carbonate and methane as well as position-specific isotopesof organic molecules offer extra information that can be used in conjunction with traditional isotope (e.g. H, C, N, O, S, Sr,..) measurements to resolve uncertainties, particularly in geobiology and biogeochemistry studies.

For instance, carbonate clumped isotopes have served as a powerful tool for paleothermometry, assessing equilibrium and a variety of other applications such as upper crustal fluid rock interactions. Doubly substituted isotopologue signatures of methane, ¹²CH₂D₂ and ¹³CH₃D, provide ways to track chemical pathways, fingerprint biogenic and thermogenic sources and to understand processes associated with carbon cycling and greenhouse methane.

This session seeks to bring together individuals working on a variety of topics in stable isotope applications in biogeochemistry and geobiology topics using traditional (e.g. H, C, N, O, S, Sr,..) isotopic measurements as well as not-traditional isotopic methods and systems (e.g. clumped and position-specific isotope measurements). We encourage submissions that will aid in the dialogue between groups working on resolving various questions in order to improve our understanding of the past and present geobiology and biogeochemical cycles on the Earth.

Natural and engineered processes in Earth systems involve complex geochemical and physical processes that manifest themselves over a wide range of spatial scales. The properties of materials in geo- and environmental systems can be attributed to compositional and morphological heterogeneity, observed over all spatial scales. However, there is a large gap in understanding how fundamental processes at the nanometer scale give rise to weathering, mineral precipitation/dissolution, compaction, deformation, and fracturing observed at the micro- to macro-scale. The gap between understanding processes at the atomistic scale and how they manifest at larger scale including global-scale patterns is a principal challenge for scientists. The use of two expanding sets of tools,  modern microscopy and machine-learning, are opening the door to addressing this challenge. Modern microscopies comprise a wide range of instrument and software developments with numerous applications in geo- and environmental sciences, using electrons, ions, AFM, nanoSIMS, and photons from infrared to X-rays. New instrumental developments in spectromicroscopy techniques have expanded the study of geomechanical and geophysical properties to the nanoscale. These experimental methods, together with theoretical and computational approaches and the implementation of machine learning tools have opened the door to the analysis of large sets of combined morphological and chemical data at the nanoscale to extract key spatial-temporal parameters and to improve parameter sets for molecular dynamics simulations. The goal here is to create a platform for cross-disciplinary discussion on how new approaches may be used to bridge the gaps in understanding of processes across scales in Earth systems.

Geochemistry was first defined as a discipline in 1838. Since then, geochemical data has been pervasively acquired and used in Earth, environmental and planetary sciences: it has become fundamental for understanding past, present, and future processes in natural systems. Today, geochemistry has numerous applications in many disciplines including environment, resources (groundwater, minerals, energy), geohealth, oceans and agriculture. Globally, multiple groups are investing in building data systems/databases to capture, store, curate and share geochemical data and related objects (physical samples, instruments, images, tools, etc.). Data system development spans the whole geochemical workflow from sampling in the field, through laboratory analysis to curation, publication and dissemination of results. As modern computational capacity increases and becomes easier to access, new and novel methods of processing and modelling data are constantly emerging: many now require aggregations of multiple datasets.

In response to Open Access and Open Science demands, groups are beginning to focus on making geochemical data FAIR (Findable, Accessible, Interoperable and Reusable). This requires the development of community-agreed standards/vocabularies/best practices that currently cover an incredible diversity of elemental and isotopic data systems and techniques used for analysis.

We seek contributions that 1) cover new developments of data systems/databases to store, curate and make geochemical data FAIR; 2) showcase new techniques in geochemical data processing and modelling and 3) are developing (meta)data standards, vocabularies and best practices to enable geochemistry data to be shared, integrated, and repurposed to meet emerging new scientific challenges, including sustainable development of our planet.

Fluid-mineral interactions play a fundamental role across many geochemical and technological processes, such as hydrothermal ore formation, lithological alteration, chemical weathering, carbon dioxide sequestration (mineral carbonation), acid mine drainage, contaminant transport and in situ leaching. During fluid-mineral interactions, element redistribution and fractionation occurs via interdependent processes of dissolution, precipitation, diffusion, and advection – during which primary mineral microstructures may be altered in accordance with changes in mineral volume and composition. Simultaneously, microstructures and constraints such as (nano-)porosity, permeability, texture, confinement effects and the presence of trace elements in fluids can exert a counterinfluence on these dynamic fluid-mineral interactions, thereby affecting element redistribution processes down to the nanoscale in natural and engineered systems. This session invites contributions of experimental studies, aimed at mechanistic and kinetic understanding on the interplays between fluid-mineral interactions, microstructures, and the (im-)mobilization, accumulation and redistribution of elements that are important for our society (e.g., base or critical elements such as Li, Co, Se, Si, Te, In, Ge and rare earth elements, REEs) and the environment (e.g., toxic elements, such as heavy metals and radionuclides). Submissions which cover new developments in experimental techniques, or those which couple experimental results with field observations or numerical modeling to better understand fluid-mineral interactions, are highly welcome.

The chemistry of ore and gem minerals provides important insights into the complex interplay of magmatic, tectonic and hydrothermal processes in the Earth’s crust and mantle. The processes that control the enrichment of trace elements in ore-forming systems are still difficult to constrain due to their low concentrations and complex distribution. However, recent advances in ore and gem mineral analysis show great potential to close these knowledge gaps. The combined analysis of trace elements and different isotope systems in ore minerals provide important insights into magmatic-hydrothermal enrichment and fractionation processes and can also help to better constrain the contribution of metals from different crustal sources. Gemstones represent a repository of geological information that can be used to understand the evolution of the Earth system. Diamonds, and their inclusions, shed light on the nature of the deep mantle. Corundum, beryl, garnet, tourmaline, and zircon record the timing and conditions of lithospheric dynamics, including the history of tectonic forces. Pegmatites produce gem minerals from the advection and crystallization of the last gasp of magmatic fluids, and are associated with strategic mineral deposits.

This session welcomes contributions that investigate the trace element and/or isotope composition of ore and gem minerals at all scales (regional to nanoscale), to better understand the metal cycle in the oceanic and continental crust and the formation of mineral deposits. This includes natural ore- and gem-forming systems, not restricted to a specific deposit-type or commodity, as well as contributions that are based on experimental studies or thermodynamic modelling.

Hydrothermal fluids control the transport and re-distribution of elements in magmatic-hydrothermal systems. Fluid-fluid and fluid-mineral reactions start from magmatic high-temperature fluid-melt fractionation to low-temperature rock alteration and final precipitation in veins and ore deposits. Evidence for these processes can be found in a variety of natural settings, including active geothermal systems and ore deposits, from the studies of veins, fluid inclusions and alteration mineralogy of metasomatized rocks. Our understanding of the effects associated with fluid-involved systems greatly depends on our ability to quantify and model the processes occurring in aqueous medium at various scales ranging from molecular speciation to large scale fluid-rock interaction in geologic systems. Here we invite contributions evaluating the role of hydrothermal fluids for metal transport and deposition in the crust combining a variety of approaches. Contributions of interest include geological evidence coupled with fluid-driven reactive transport and thermodynamic modeling in natural systems as well as fundamental experimental and theoretical research comprising molecular simulations and solubility/speciation and spectroscopic experiments. We also encourage contributions that address the chemistry of these hydrothermal fluids and minerals, the partitioning of elements among phases, and the solvent/solute properties . Through the integration of these topics we aim to shed new light on the frontiers research on fluid-mediated processes that control the mobility of elements and ore deposition in the Earth’s crust.

The study of physicochemical properties of melts and fluids in planetary interiors is fundamental to understanding the dynamics and evolution of terrestrial planets and moons. During planetary core formation, the segregation of metallic liquids from silicate melts extracted most of siderophile elements into the metallic core. At present, important processes related to melts and fluids include, but are not limited to, the solidification of molten outer cores, which powers planetary dynamos; melting of silicates in chemically active regions from the crust to the deep mantle, which is essential to the chemical differentiation of planetary interiors by producing magmas near the surface or deeply trapped partial melts; dehydration/decarbonation of the subducted oceanic lithosphere, which produces ore forming fluids. This session focuses on the physical and chemical properties of melts and fluids and their structural information on the atomic level. Topics may include but are not limited to density, elastic properties, diffusivity, viscosity, electrical conductivity, structural, and chemical properties of melts and fluids, and their roles in the planetary processes occurring at depths. We encourage contributions from both experimental and theoretical studies on melts and fluids, as well as those from the perspectives of seismological, geodynamical, and geochemical studies of melts and fluids in the deep interiors of Earth and other terrestrial bodies.

A broad diversity of eukaryotes and prokaryotes can form mineral phases, a process called biomineralization. While the same basic principles of mineral nucleation and growth may apply to all these organisms, a variety of biochemical mechanisms can be involved. Moreover, the resulting byproducts, biominerals, have received several types of interest from different scientific communities: they can be used as paleobiological or paleoenvironmnetal proxies; they can be pathogenic; they can hold crucial functions for the organisms; they can play a significant role in geochemical cycles. Here we invite all contributions dealing with biomineralization and biominerals, including studies of biomineralization mechanisms, the development and/or use of new analytical tools particularly well adapted to the characterization of organic-mineral assemblages, or sudies evidencing and/or quantifying the importance of biominerals in present or past environments.

Geologic interfaces between rock components (e.g., organic matter and minerals) and fluids (e.g., petroleum and formation brine) affect energy and mineral resource generation, recoverability, and storage. In addition to traditional hydrocarbon and ore resources, the recent push for decarbonized energy sources has spurred much interest in hydrogen both as an energy carrier and in subsurface storage. However, geologic interfaces are notoriously complex necessitating the use of advanced analytical and computational approaches to provide insight on reaction channels and their associated kinetics. This session will combine contributions investigating both abiotic and microbially-mediated reactions, processes, and formation kinetics of molecular hydrogen, hydrocarbons, and mineral resources at geologic interfaces in the subsurface. While this session aims for a broad audience, submissions presenting novel characterization approaches, advanced computational simulations, and studies synthesizing field, laboratory, and computational observations are especially welcome. Therefore, we are especially grateful for two keynote talk on the H₂-promoted coevolution of minerals and carbon in ancient and modern rocks by Benedicte Menez and on similarity and dissimilarity of factors controlling methane and hydrogen gas adsorption in geologic formations by Arkadiusz Derkowski. Additionally, this session will highlight presentations that integrate research on controls of resource migration and storage, and natural hydrogen accumulations in the geosphere.

Geothermal systems may provide important carbon-free energy resources. The main scope of this session is to explore both innovative and long-validated approaches applied for the geochemical characterization of geothermal areas. As known, drilling is the only direct method to access the subsurface features of a given system (and its physical state), but various techniques have been developed to investigate the targeted reservoir before drilling. The most reliable methods for investigating high, medium, and low enthalpy geothermal systems are geological field observations, structural geology, geophysical methods and geochemical characterization of fluids and gases. The latter allows to obtain detailed broad-spectrum information with a relatively low cost, useful for a preliminary reconstruction of the geothermal conceptual model that represents the starting point for efficient exploitation and an adequate management including scale formation and mitigation of environmental impacts.

This session specifically aims to discuss studies utilizing multidisciplinary geochemical approaches in terms of water and gas geochemistry, isotopic composition, geothermobarometric functions and both classical and geostatistical elaboration of major and trace constituents (including toxic elements such as Cr, Ni, As, Cd, and Hg). We also encourage studies concerning the Rare Earth Elements (REE) in geothermal fluids.

Carbon capture, utilization, and storage (CCUS) is one of the proposed key mitigation strategies to limit global warming to below 1.5 ℃. Multiple techniques are being developed, including injection of CO₂ into old fossil fuel reservoirs, creation of biofuels, and carbon mineralization, where dissolution of igneous rocks and carbonate precipitation are accelerated to store CO₂ in the form of environmentally benign and stable carbonate minerals. Geochemical, biological and physical processes are critical in many aspects of CCUS, including 1) assessment of storage potential, reservoir permeabilities and possible migration pathways, 2) development of innovative CO₂ capture methods from air, water, or biology, such as direct injection, enhanced weathering and bacterial carbonatogenesis, and 3) monitoring CO₂-fluid-rock interactions and mineralization in the subsurface.

This session will explore scientific advances and innovations relating to CCUS, including assessment, optimization and monitoring techniques. We invite contributions focusing on laboratory and in situ experimental works, analogue tests, field trials, reaction path and transport simulations. We aim to cover and explore geochemical and/or biological approaches, in-situ monitoring technologies, and environmental impact studies around geological CO₂ storage and other mitigation strategies.

Anthropogenic climate change has led to an imperative need for carbon neutral solutions for energy generation, resulting in renewed interest in nuclear energy. Thus, the safe management of nuclear waste in deep geological repositories is a large challenge. To address this challenge an understanding of the relevant mineralogical, geochemical, and hydrogeological processes is required. The aspects of these processes comprise: (i) characteristics and long-term performance of waste forms (such as spent nuclear fuel, glasses, concrete, and ceramics), (ii) mineralogical and mechanical evolution of the compartments of a multi-barrier system especially at the interfaces between dissimilar materials, (iii) sorption of radionuclides to relevant mineral phases in the multi-barrier system and the formation of secondary phases / solid-solutions, and (iv) radionuclide sorption and migration behavior in the host-rock formation. These processes are controlled to a varying degree by thermodynamics and reaction kinetics that can be affected by the radiation field in the repository and the hydrodynamic regime. A mechanistic understanding of the process from the molecular to the macro scale is essential to provide scientific support of the safety case for a deep geological nuclear waste repository.

With this session we aim to bring together researchers working in these fields with a particular emphasis on the waste form/barriers in a deep geological environment. Contributions from experimental studies, as well as molecular simulations aiming to improve our understanding of mineralogical, geochemical, and hydrogeological processes relevant for the safe disposal of nuclear waste are welcome in this session.

Orogenic gold deposits in metamorphic terranes contain 40 % of the global gold endowment. This session welcomes presentations of novel approaches in mineralogical, geochronological, isotopic, geochemical, and experimental studies to the understanding of orogenic gold. This includes work addressing aspects of fluid and gold source, fluid conduits, gold transport, and gold precipitation mechanisms. Descriptions of tectonic, geological, and structural features of important new greenfield and brownfield discoveries; exploration histories that led to recognition of new large gold resources; and improved genetic models for orogenic gold formation are also encouraged.

As society shifts towards a low carbon future, global demand for minerals, metals and engineered materials is increasing significantly. Minerals and raw materials (from metals such as Ni, Co, Li and the REE, to new artificial materials) are increasingly required for renewable energy, electrification of transport, and energy storage. However, discoveries of world-class mineral resources have dramatically decreased over recent decades and the next ore deposits are likely to be concealed at depth. Understanding of ore-forming processes must be coupled to new exploration approaches and techniques, in order to identify future resources. Associated with this is a need to design environmentally benign chemical processes, for both mineral processing and development of new materials. This session covers the geology and geochemistry of critical mineral resources, including basement deposits, those formed within the cover by weathering processes, and waste materials; new and low-impact methods for mineral processing; and the generation of lower-carbon bulk materials such as cement and fertilizer.

Hydrocarbon extraction from shale and tight reservoirs play a critical role in the transition a to low-carbon economy, as their target products are natural gas and light oil of lower carbon emission than traditional fossil fuels. Geochemical processes in conventional versus unconventional petroleum reservoirs, however, are contrasting. In this session, we include a breadth of topic from source rock character to recovering valuable critical metals associated with the production process. We invite contributions highlighting:

1. petrophysical and chemical processes in petroleum systems, thermodynamic and kinetic processes at all stages, and elemental, molecular and isotope geochemical tracers for hydrocarbon source rocks and migration fairways.
2. enhanced productivity, factors essential for preservation in organic-rich source rocks and for breakdown of organic matter (microbial processes), and how sedimentation rates serve as a measure for palaeoproductivity.
3. mineral-organic associations and reactions in organic-rich rocks, including transformation, trapping, and stabilization of organic compounds and the interplay between inorganic mineral alteration and organic matter evolution.
4. critical metals and rare earth elements enriched in organic-rich rocks. Despite the abundant occurrences of various dissolved salts and the critical metals in hydraulic fracturing flowback and produced water (HFFPW), most HFFPW is currently being disposed of through deep formation injection as wastewater at significant costs because of their potential hazards to the environment. HFFPW characterization of major unconventional oil/gas operations worldwide is needed to evaluate environmental impact, assess untapped critical metal resources, and possibilities for CO2 sequestration.

Global warming caused by anthropogenic CO₂ emissions results in catastrophic effects on the health of the biosphere as well as human society. One promising mitigation strategy is the capture and sequestration of CO₂ by mimicking Earth’s long term carbon cycle. Chemical weathering of silicate minerals by atmospheric CO₂ both produces alkalinity and naturally releases Ca²⁺, Mg²⁺, and Fe²⁺ cations, which subsequently can bind with carbonate anions during carbonate precipitation, sequestering the carbon as a solid mineral. Enhancing natural chemical weathering and carbonate precipitation reactions can aid in the mitigation of climate change by either trapping CO₂ as alkalinity, for example during terrestrial or coastal enhanced weathering, or by trapping CO₂ as a mineral, for example during mineral carbonation of mafic rocks.

There is a pressing need for engineered CO₂ sinks drawing on rock-mineral-CO₂ interactions. However, key questions remain regarding efficiency, scalability, safety, and permanence. This session aims to highlight research investigating the interactions between CO₂, fluid, and minerals in both subsurface and surficial environments and related carbon sequestration applications. We also welcome submissions that focus on mechanisms and rates of silicate mineral dissolution under natural weathering conditions. This session welcomes experimental, field-based, and modeling-based contributions addressing all aspects of carbon sequestration, including methodologies with the potential for constraining the fate of CO₂ during mineral-fluid-CO₂ interactions and quantifying the sequestration potential and permanence of various systems. We also welcome submissions related to the technical, societal, and/or environmental challenges associated with the large scale deployment of these techniques.

(Bio)chemical sediments such as carbonates, lithified microbial mats (microbialites and stromatolites), phosphates, cherts and banded iron formations are abundant throughout Earth’s history and formed under various environmental conditions. Hence, they are excellent archives for recording Earth’s geochemical and geodynamical changes through time. Recent advances in analytical procedures and proxy development improve our understanding of physico-chemical conditions in ancient and modern environments. For this session, we invite contributions from the interdisciplinary fields of trace element, bio- and isotope geochemistry as well as sedimentology and experimental approaches that target (bio)chemical sediments of various (paleo)-environments to better pinpoint the co-evolution of the atmosphere, hydrosphere, biosphere, and continental lithosphere from the early Archean until today.

Earth’s atmosphere, oceans and biosphere have undergone dramatic changes over the past 4.5 billion years, and many of these changes are intricately linked through biogeochemical feedbacks. This session invites contributions from geochemistry, paleobiology, climatology, sedimentology and stratigraphy that document these changes and feedbacks through investigations of the rock record or new numerical models. We encourage presentations of case studies as well as interpretations of global datasets and discussions of novel hypotheses about the co-evolution of Earth and life, in particular across the two major oxygenation events at the beginning and end of the Proterozoic.

The Phanerozoic, spanning the last ~540 million years, has experienced a number of major and minor extinction events, and significant radiations of biotic life both in the marine and terrestrial realms. Accompanying these events are dramatic environmental changes, ranging from widespread glaciation to hothouse conditions. Ocean oxygen levels have expanded and contracted as volcanic events waxed and waned. Climate has changed both abruptly and gradually, as biodiversity rose and fell and rose again. In this session, we invite contributions containing the latest research focusing on the interplay between geologic, biologic, and environmental processes within the Phanerozoic. The session will contain special emphasis on new field sites, novel materials, innovative methods, and the development/refinement of proxies.

The main scope of this session is to explore and evaluate both innovative and long-validated approaches applied for the hydrostratigrapic and geochemical characterization of coastal areas. As is already well known, the sustainable development and management of coastal plains has received significant attention worldwide during the last few decades. Coastal areas and coastal plains are suffering the adverse consequences of hazards related to geological processes, climate change, and sea-level rise. The impact is worsened by increasing human-induced pressure due to land-use and hydrological changes, including reclamation works, embankments, dams, and overexploitation of groundwater. In most Mediterranean coastal areas, one of the main problems associated to governance is the overexploitation of groundwater to meet the growing population demand which increases the effect of salinization processes, subsidence, and/or flood damages.

Specifically, this session aims to provide an opportunity to promote multidisciplinary geological and geochemical approaches in terms of hydrostratigraphy, water and gas geochemistry, isotopic composition, and both classical and geostatistical elaboration of major and trace constituents (including toxic elements such as Cr, Ni, As, Cd, and Hg).

Global climate warming disproportionately affects ecosystems of the high-latitude and high-elevation cold regions. The Critical Zone in cold regions comprises components that are especially vulnerable to warming – snow cover and permafrost – as well as soil microbial communities adapted to cold temperatures. Changes in the cold regions’ biogeochemistry, hydrology and hydrochemistry are connected to climate feedbacks through greenhouse gas emissions. Research on how cold regions’ microorganisms respond to shifts in environmental conditions is of particular importance for anticipating how a warming climate will affect the biogeochemical cycling of carbon, nutrients, metals, and pollutants in the Earth’s cold regions. Meanwhile, warming facilitates the expansion of agriculture, urban growth, and access to natural resources, further adding to the anthropogenic pressures on the cold regions’ soil ecosystems. The complex interconnections of hydro-bio-geochemical processes in cold regions poses multiple challenges to their realistic representation in earth system models. The cold regions’ Critical Zone therefore requires the integration of process-based investigations with multiscale monitoring and modeling tools. This session will focus on interdisciplinary research that advances our predictive understanding of the biogeochemical processes, microbial-plant interactions, and water quality in cold regions. We invite presentations that provide new insights into cold-adapted microbial activity, hydrogeochemical processes and connectivity in the cold region Critical Zone, changes in carbon and nutrient cycling due to climate warming. Field, laboratory, and modeling studies are all welcome.

The Tibetan Plateau is the highest and largest plateau on Earth, with an average elevation exceeding 4,500 meters. Tibetan uplift is one of the most significant global geological events during the Cenozoic, which not only controlled the evolution of the Asian environment but also possibly played a significant role in the Cenozoic cooling. In recent years, the large-scale comprehensive scientific investigation of the Tibetan Plateau with new technologies and novel methods by multidisciplinary researches has brought exciting new perspectives. New findings have aided progress in our understanding of the history of Tibetan uplift, including its driving mechanisms and how these processes drove regional and even global change. This session encourages studies that are topically related to our understanding of how, where and when Tibetan Plateau uplift and its impacts on the regional geomorphology, environment, weathering, erosion, as well as global climate. In particular, we welcome high-quality contributions focusing on the following topics

1) Erosion and weathering processes recorded in the continental basins and Asian marginal seas；

2) Tectonic links to continental weathering, global cooling and biogeochemistry cycles (e.g., C, Mg, Sr, Li, etc.);

3) Response and co-evolution of Asian monsoon- aridification environments to the tectonic uplift;

4) Uplift and its environmental impacts through Earth system model perspective;

5) Modern earth surface processes in the Tibetan Plateau and adjacent regions;

6) Quantitative temperature and altitude reconstructions from organic biomarkers and clumped isotopes.

Soil and sediment organic matter pools represent significant stores of carbon, and thus processes that control turnover of these pools are critical for understanding global biogeochemical cycles in the Anthropocene. For example, changes in vegetation quality and quantity, temperature, and moisture are shifting the biogeochemical processes that regulate soil organic matter stabilization and destabilization in ecosystems world-wide. These changes in terrestrial-derived organic matter are potentially altering inputs into sedimentary environments. Within the ocean floor, organic matter exported from both land and the upper ocean is subjected to further processing, where labile components are oxidized to their inorganic constituents and returned to the water column, leaving the more refractory material to be preserved. A fraction of sedimentary organic matter is also transformed into dissolved organic matter which can re-enter the water column. Understanding the transformation of organic matter during early diagenesis in marine sediments is therefore key to better understanding the linkages between the short-term aquatic carbon cycle and the long-term geologic carbon cycle. We aim to bring together a range of researchers studying the persistence and transformation of organic matter in diverse ecosystems across different time scales throughout the geologic record. We welcome submissions from different approaches (experimental and modelling) and from presenters who are interested in taking cross-cutting and multidisciplinary approaches to advance our understanding of organic matter dynamics in soil and sedimentary environments with the overall goal of providing a more holistic connection between terrestrial and aquatic biogeochemical processes.

The interactions between geology, biology, and climate are complex, inter-dependent, and non-linear. Yet if we are to understand the structure and functioning of the Critical Zone – the layer of the Earth’s surface where rock meets life – it is imperative we unpick these interactions.  This thin layer of rock, regolith and soil is where weathering occurs, carbon is stored, plants obtain their nutrients, sediment is eroded, and water passes through. These processes are all potentially sensitive to climate change and other human perturbations, including land-use change, pollution or ecosystem disturbance. How the chemical and physical properties of the system respond, and what this means for weathering and erosion fluxes, is unclear.

Understanding the response of past hydrological and aeolian processes to climate change can help to better predict the future. Monsoon, one of the most captivating natural processes operating on this planet, is associated with the annual reversal of prevailing surface winds. There are seven major monsoon systems that operate through Eurasia-to-Australia, Africa. and America. Monsoon rainfall is the lifeline for more than half the world’s population. Changes in the monsoon precipitation due to the thermodynamic effects of the increasing amount of greenhouse gases during the twenty-first century have been predicted. Geochemical records from paleoclimate archives of oceanic and continental origin together with climate simulations offer an opportunity to understand the sensitivity of monsoon systems to regional and global-scale climate forcing.

On the other hand, aeolianite deposits are globally well distributed in the low and mid-latitude dryland areas. Studies on these deposits can provide valuable insights in understanding the spatial and temporal changes in biological productivity and linkages between different components of terrestrial and oceanic systems 

The amount and spatio-temporal distribution of precipitation can affect the supply and mobility of sediment. Thus antecedent monsoonal precipitation can influence the formation of aeolian deposits. Despite the monsoonal precipitation and aeolian dynamics being closely related to each other, the interactions between these two processes remain poorly understood. 

The present session hosts contributions probing palaeomonsoon and aeolian dynamics on sub-seasonal to millennial timescales and their interactions with climatic systems over the Quaternary using geochemical proxy records from different paleoclimate archives as well as modeling studies.

The earth’s climate is regulated by a range of geochemical processes on Earth’s surface including the chemical weathering, organic carbon oxidation and export. Physical erosion plays a central role in these processes. Increasing a growing number of studies have shown how extreme events (such as earthquake, large storms, and wildfires) and global change (such as global warming and land-use change) can have cascading impacts on the erosion and therefore on the global carbon cycle across a range of timescales. Large earthquakes and storms can trigger widespread landsliding, significantly perturbing earth surface dynamics. Ongoing and future global warming, combined with other climate effects and human activities, may destabilise mountain slopes, and accelerate natural processes such as rock organic carbon and sulfide oxidation which can release greenhouse gas. It is still a major challenge to quantify the long-term impacts of extreme events and global changes on the earth surface processes due to their rarity and spatial heterogeneity. This session aims to bring together researchers from a range of disciplines to that seek to quantify and understand the impacts of extreme events and global changes on the sediment transport, weathering, green-house gas emission, carbon export and burial. Studies incorporating lab and modern field observations, insights from geological archives, new proxies and model simulations are all welcome. We encourage submissions from early career researchers and interdisciplinary studies across geomorphology, biogeochemistry, and ecology.

Continental surface processes, including physical erosion, chemical weathering, and biogeochemical activity, play a critical role in shaping the Earth's surface environment and maintaining climatic stability over the Earth's past. However, many questions remain concerning the mechanisms, modes, feedbacks and rates of Earth's surface systems. In this session, we encourage submissions that highlight applications of terrestrial cosmogenic nuclides, stable isotope systems, uranium series, and other novel proxies for the quantitative, process-oriented study of Earth surface processes. This can include the development of new and/or underutilized isotopic systems, as well as methodological developments for existing, well-established systems, such as advances in sampling strategies, analytical methods (e.g., chemistry, mass spectrometry), and the statistical treatment/modeling of data. We likewise welcome submissions that feature new datasets or interpretations of datasets that address outstanding questions about the timescales and mechanisms of physical and biogeochemical processes that shape Earth’s surface.

Microbial interactions with minerals are a fundamental driving force of biogeochemistry. Microorganisms can form, dissolve, and transform minerals, resulting in lithification, weathering, nutrient cycling, and other processes key to the planetary change. Despite the importance of microbe-mineral interactions, there are many outstanding questions related to the mechanisms and pathways, roles of consortia/communities, ecological influence, and applications of these interactions to energy and material resources. We invite contributions that highlight advances in this area made through the study of field and model systems, as well as novel analyses and combinations of approaches, including but not limited to geochemistry, geophysics, microscopy, physiology, omics/bioinformatics, ecology, and biochemistry. In this session, we will highlight interdisciplinary contributions that investigate important questions in environmental, industrial, and early Earth spheres, spanning scales from enzymes to global effects.

Methane, the simplest hydrocarbon molecule, is a powerful greenhouse gas and an important carbon compound for deep biosphere. From a climate perspective, up to 25% of postindustrial global warming is attributed to methane gas and up to 50% of global methane emissions are suggested to come from highly variable aquatic ecosystems present. From a biogeochemical perspective, methane production, transport, and oxidation across the sediment-water column-atmosphere system induces unique geosphere-biosphere interaction that are critical to our understanding of greenhouse gas budgets, carbon and associated elemental cycling (e.g., sulfur, iron, calcium, and trace elements), and microbial ecology. Furthermore, aquatic methane dynamics are suggested to have a critical role in Earth’s paleoclimate and biosphere evolution over geological history. Hence, our understanding about biogeochemical cycling associated with methane in inland wetlands and marine settings and their spatio-temporal variations is an important scientific objective.

This session invites contributions on biogeochemical implications of methane production, accumulation, and transport through the sediment-water column-atmosphere systems. Studies pertaining to the microbiology, organic and inorganic geochemistry, isotope geology, and geochemical modeling of methane-related biogeochemistry from aquatic systems and sediments (lakes and ponds, rivers, estuaries, oceans etc.) are invited. Paleo-perspective based on lacustrine and marine sediment/rock records as well as present and future perspectives on the role of anthropogenic impact and climate change on aquatic methane dynamics are also invited.

Organic geochemical records of biosignatures—including molecular fossils, metabolic or physiological signatures, and isotopic tracers—provide a unique window into the climatic, chemical, and biological evolution of Earth systems. Biosignature records allow for the reconstruction of both the biological processes mediating elemental cycling and the resulting co-evolution of the biosphere and the geosphere. Interpreting these complex records requires a process-oriented understanding of the sensitivity of biosignatures to environmental, physiological, and evolutionary change. Modern systems including extant organisms, culturing experiments, genomic information, and analog environments allow us to build the proxy and modeling frameworks used to reconstruct the geologic past. Ultimately, using modern processes to reconstruct past biogeochemical and organismic evolution may help us understand future Earth surface conditions.

In this session, we aim to bring together scientists interested in organic geochemical proxy development and applications. We invite contributions from researchers studying a broad range of systems—from pure cultures to terrestrial and marine environments—on all spatial and temporal scales. We particularly encourage contributions that focus on modern systems and transcend disciplines to integrate information from a variety of sources such as organic matter, biomarkers, isotopic compositions, genetic markers, experimental biology, and others. We also encourage submissions highlighting novel analytical, experimental, modeling approaches as well as paleo-applications.

The importance of the oceanic biological pump as a modulator of atmospheric CO₂ levels and global climate cannot be overstated, yet, some fundamental aspects of its dyanamics are still not well understood, such as the quantitative and qualitative impacts of terrigenous inputs into the oceans. These include dust, river outflow, glacial meltwater, submarine groundwater discharge (SGD), and other processes along the margins, all of which impose strong controls over the efficiency of the biological pump. Constraining their rates, sources, sinks and role in biogeochemical cycles is critical for achieving a full understanding of the dynamics of the biological pump.

Here we seek contributions that utilize trace elements and their isotopes to describe the following non-exclusive topics: 1) Quantification and characterization of terrigenous inputs (dust, rivers, SGDs, etc.) into the oceans and their impact on the marine environemnt, 2) Studies of temporal and spatial patterns of terrigenous fluxes and their interplay with marine productivity and export production, 3) Macro and micro scale interactions between terrigenous material and organic carbon, 4) New methodologies and approaches to studying the role of trace elements in the marine biological pump.

The submission of multidisciplinary studies is encouraged, including applications of organic geochemistry, radionuclides, experimental and analytical isotope geochemistry, modeling, and trace element phase partitioning. In addition, we welcome time series –based studies, both in the modern oceans as well as paleo records.

Trace metals exhibit a wide range of chemical, physical, and biological reactivities (e.g. oxidation, precipitation, sorption, complexation, toxicity) depending on their chemical and physical speciation (e.g. ions, ion pairs, organic and inorganic complexes, colloids, suspended particles). Thus, the speciation of metals is of great importance not only to substantiate the geochemical fate of trace metals in the world’s ocean but also to estimate their availability and toxicity to marine biota. Geochemical interfaces are of particular interest because they exert a great control on trace metal cycling, fluxes, and rates and a full understanding of trace metal speciation along these boundaries is necessary for a more holistic understanding of the fate of trace metals in the marine environment. However, despite decades of marine trace metal research, we are still lacking knowledge of the speciation along geochemical interfaces (i) in space and time; (ii) the underlying driving processes; and (iii) their role for the global marine biogeochemical element cycles. Geochemical interfaces include sediment-water and atmosphere-water boundaries as well as regions with physicochemical gradients of density, redox conditions, temperature, pH, or salinity, such as hydrothermal systems, ground water discharges, deep sea environments, estuaries, and coastal embayments.

This session brings together transdisciplinary scientists, exploring trace metal speciation at various marine geochemical interfaces. We encourage contributions relating to novel analytical tools, modelling approaches, and laboratory-based experiments.

Groundwater-surface water exchanges occurring across terrestrial-aquatic interfaces (TAI) significantly influence watershed processes, including hydrology, ecology, and biogeochemistry. TAI represent a spectrum of fluvial and hydrogeomorphic elements such as meanders, floodplains, wetlands, marshes, lakes, lagoons, and hyporheic zones. In particular, TAI play an important role in controlling the exchange of water and chemicals between land and water systems and, therefore, impact macro- and micro-nutrient cycling and downstream water quality. To advance process understanding of terrestrial-aquatic exchanges along river corridors and the surface water-groundwater interface, here we invite presentations that (a) examine hydrobiogeochemical processes such as redox dynamics and biogeochemical transformations of carbon, nutrients, or metals occurring at the TAI; (b) approaches to deal with TAI biogeochemical heterogeneity on spatial and temporal scales in characterization and scaling (c) identify and characterize geomorphological features and processes affecting exchanges from/to TAI, and (d) investigate and quantify multi-scale properties of terrestrial-aquatic exchanges. Finally, we also welcome new methodologies and the combination of approaches to characterize surface water/groundwater interactions and associated forcing mechanisms.

The introduction of multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS), and the emergence of “non-traditional” stable isotope geochemistry has induced a period of exponential growth in isotope geochemistry. Namely, this era has seen the advancement and refinement of conventional isotope geochemistry techniques, e.g. LA-MC-ICP-MS, MC-ICP-MS/MS, and isotope ratio determination by [LA]-Q-ICP-MS for both stable and radiogenic isotope systems, and the means to address scientific inquiry in medical, archaeological, environmental and forensic sciences, as well as in more economical ventures such as ore exploration. With this paradigm shift, and notably with the increased throughput capacity of modern instrumentation, has also come the potential for applying stable and radiogenic isotope systematics at larger scales, e.g. to larger sample cohorts towards the development of isoscapes, paleo-environmental reconstructions, and towards large and statistically robust datasets such as those needed in ore exploration and medical application. Isotope geochemistry can now contribute answers to a range of questions that really are a matter of life-or-death, that is, understanding how living vertebrate organisms (from dinosaurs to mammoths to humans) lived and died. This includes looking at the past: where did animals go, and what/who did they eat? But also investigating the causes and mechanisms of diseases.

Recent analytical developments of isotope systematics, for instance metals and metalloids (Hg, Cr, Zn, Cu, Pb, Cd, Tl, Ag, Sn, U, Fe, Se, Mo, U, Ra, Th) in the Environment, have experienced an unprecedented increase over the past few years. It is well known that: 1- the contribution of human activities such as industries, agriculture and various domestic inputs, becomes more and more significant in natural systems, 2- metals mining and both conventional and unconventional hydrocarbon extraction can have a considerable environmental footprint, and 3- within the framework of the exploitation of unconventional gases and oil, chemical elements potentially toxic to humans and wildlife (called the radionuclides toxic metals: RTM) pollute the flowback waters.

The aim of this session is to explore methods, indicators and research applications using innovative isotope systematics of elements such as H, C, N, O, S and Hg, Zn, Cr, Cu, Cd, Mo, Ag, Se, that in fine will provide: i) stronger constraints on the origin(s) and ii) a better characterization of the processes controlling the budgets of toxic metals and compounds in the Environment (e.g., soil, sediment, water, air) at local and global scales, in addition to transfer of these constituents to the food chain and potential effect on human health.

Radon is applied as a powerful investigation tool in various fields of the geosciences, though the main concern regards the radiation protection due to its important effects on human health.
At the surface the indoor radon concentrations and the exposure from radon are controlled by many factors such as anthropogenic and meteorological. However, the pore structure of outcropping rocks mainly control its concentration in the shallow environment. Tectonic radon migrating along permeable pathways may enhance the background production of Rn derived by its parent nuclide decay, this modifying the shallow distribution of the geogenic potential. Radon potential maps that account for geological factors and observed soil gas radon values may be used to define radon-priority areas that could help target population-based lung cancer prevention interventions given the inequities that exist related to radon.
While geogenic and tectonic radon govern the transport in-soil and the surface emission, entry paths indoors are defined by other factors such as permeability, building, and architectural features, ventilation, occupation patterns, etc.
This session aims to discuss concepts and frameworks that improve the understanding of radon concentrations (in the soil and indoor) and geological formations, and to examine potential population-level lung cancer risk from radon exposure.
This session welcomes contributions from geochemists, physicists, geologists, physicians for examining the spatial and statistical associations between radon values and geological factors, discussing and sharing ideas and knowledge on the influence of geology on radon emission, health implications, measuring and mitigation methods, and its areal representation using the geospatial analysis.

Tracers such as noble gases, SF₆, CFC, ³H, ¹⁴C, ¹⁸O and D have traditionally been used to reconstruct environmental and climatic conditions, the age structure and provenance of water bodies and to evaluate biogeochemical processes. Advances in analytical methods have broadened the application of tracers to assess the evolution of natural waters. For example, laser base ³⁹Ar and ⁸¹Kr measurements allow residence time estimates in time windows that were previously unavailable. Gas probes, field mass spectrometers, and portable stable isotope analyzers allow the evaluation of high-frequency transients associated with seismicity, CO₂ capture and storage, gas evolution, and volcanism. High precision measurements of ¹⁷O are leading to new insights into aridity. Collectively, these developments open a novel analytical route for evaluating the sustainable use of water resources.

This session invites contributions on innovative methods and novel applications involving tracers in aquatic systems. We also invite examples and innovative numerical methods for connecting measured tracer concentrations to physical processes.

Geochemical speciation reactive transport models are often used to describe results of various materials characterization methods, laboratory experiments as well as various field scenarios. The ability to capture chemical reactions (adsorption, speciation, dissolution/precipitation, redox and kinetics) as well as transport (advection, diffusion, vapor transport) phenomes is essential tool for a better understanding of fundamental problems and for predictive models. These models are often used as important tools for decision making by regulators or for better planning and designing of solutions for environmental problems, ranging from reuse and disposal of conventional high volume waste streams (e.g., slags, coal ash) to nuclear waste management.

The session will cover: i. latest developments in reactive transport platforms (ORCHESTRA, PFlotran, GEMS, MINTEQ, PHREEQC and others); ii. development of thermodynamic databases, especially with respect to radioactive waste, cements phases and other constituents of interest; iii. integration of advanced geochemical reactive transport modeling with laboratory experiments or field studies designed to understand underlying fundamental processes; iv. predictive geochemical speciation and reactive transport modeling that are used to provide input for performance assessments as part of a system safety evaluation; (v) model and prediction uncertainty assessment, (vi) use of geochemical models in regulatory decision making.

Determining the speciation, transport and fate of metals, metalloids and organic compounds in the environment is important both for understanding terrestrial and aquatic ecosystems and for the remediation of contaminated water and soil. With improvements in spectroscopic techniques comes the ability to constrain the relationships between adsorbed and precipitated species and environmental surfaces with which these species interact, including naturally occurring minerals, bacteria, organic matter, and engineered materials for contaminant remediation. In this session, we invite presentations that focus on the use of spectroscopic tools to probe the surfaces of environmentally relevant solid phases, to develop an understanding of the complexation and precipitation of species bound at the water-sorbent interface in natural and engineered systems.

Alteration to the rate or intensity of natural weathering of metal ore deposits has the potential to negatively affect Earth's surface environments. Changing chemical conditions (e.g., pH, temperature, redox potential) surrounding mine waste storage facilities may induce re-mobilisation of metal(loid)s in environmental systems. Increased release and discharge of metal(loid)s to soils, surface and/or groundwater, and uptake by biota can pose a threat to living organisms including humans.

Differentiating between the cumulative effects of natural geochemical cycling, resource development, and climate change in environmental systems is challenging. Novel challenges arise where i) the geochemical fingerprint of potentially well understood, pointed anthropogenic metal(loid) sources such as those from mining activities are admixed with more diffuse modern origins (e.g., burning of various fossil fuels, fertilizer industry), or where ii) climate change and all its local and over-regional effects complicates our understanding of the anthropogenic signal dispersal and deposition. This session aims to identify and address current knowledge gaps related to the compounding influence of environmental management, anthropogenic development, and climate change on the reactivity, mobility, fate, transport, and toxicity of metal(loid)s from mineralized sites. With the overarching aim to trace and quantify changes to the present-day cycles of anthropogenic metal(loid)s from source to larger sinks, we welcome contributions that suggest new and combined strategies (including e.g., isotope tracers) to fingerprint and quantify sources of anthropogenic metal(loid) release to the atmospheric, aquatic and terrestrial environment, from the micro-scale to the global scale, using a variety of techniques and approaches.

Arsenic (As) is one of the most investigated elements worldwide due to its negative impact on the environment and human health. Several primary and secondary minerals contain As both as an essential structural component and/or trace constituent. Its geochemical mobility depends on several environmental factors like pH, T, conductivity and redox conditions of the studied environment. In addition, microbiological factors are important to consider for As-related mobilization processes.

Arsenic can enter in the food chain through ingestion of drinking water and contaminated food, exposing the consumers to moderate risks which can evolve into carcinogenic health effects. The problem of As-polluted water affects the whole world, thus define the behavior of the pollutant into each environment as well as developing targeted treatment technologies, is closely required to limit its negative effects and reach the threshold values established by different countries. With the overall aim of identifying health risks and improving health-related concerns, integrated studies are key to better predicting potential risks related to As in the environment.

The proposed session encourages novel contributions concerning integrated scientific knowledge gained from both the field and laboratory to better understand the environmental biogeochemistry of As. Contributions regarding multidisciplinary case-studies, geochemical survey and modelling, effects on human health, remediation methods with special focus on sustainable management of the process, artificial intelligence, are welcome. This session will serve as a platform to share tools that have been developed to manage critical health concerns related to As in the environment.

Groundwater and surface water are the primary water resources for the worldwide public comprising agriculture, livestock, industrial activities, and household requirements. The intensive use of chemicals in past decades combined with inadequate waste management resulted in many contaminated sites worldwide. Heavy metals, pesticides, nanoparticles, microplastics, and industrial effluents are contaminating water resources at an increasing rate. Deeper insight and understanding of the geochemical processes and interaction of groundwater and surface water with host matrix, soils, recharging rainwater, and seawater edge of coastal aquifers is vital to interrogate. Human exposure to water and soil contamination may cause adverse effects such as cancer, neurotoxicity, and endocrine disruption. We encourage submissions covering a broad scale of approaches - from molecular modeling, through advanced experimental techniques, to field-based experiments on: Appraisal and identification of the surface and groundwater polluted regions; Surface water and groundwater interaction; Soil contamination, Geophysical techniques to address pollution and potential zone demarcation; Statistical, GIS, and modeling techniques to interpret and visualize the hydrochemical data; Human health risk assessment and ecology in surface and groundwater and soil resources; New (nano)materials and application of in innovative remediation processes.

Keywords: geochemical imaging, groundwater, human health, soil pollution, water resources, nanomaterials

Emerging pollutants (EPs) are often defined as synthetic or naturally occurring substances that are not commonly monitored or regulated but demonstrated or suspected to cause detrimental environmental effects. These contaminants include, e.g., pharmaceuticals, personal care products, various metals with emphasis on the less studied elements like Rare Earth Elements or Platinum Group Elements, and nanomaterials. These pollutants have a complex behavior controlled by the critical zone's biogeochemistry. Some data are available on their fate mainly obtained from standardized tests. Nevertheless, our knowledge regarding EPs in complex and natural environments remains scarce. This session aims to address our understanding of the bio-physical-chemical mechanisms controlling the origin, fate of these substances, and associated risks, including mobility, spatial distribution, accumulation, bioavailability, bioaccessibility, transformation, and treatment /remediation solutions. We especially looking for studies that cover the following: (i) Methods for tracing the origin of contamination in the critical zone or watershed/coastal area, source-to-sink approach, fingerprinting, identification of geochemical background; (ii) the mobility of these contaminants, including methods of quantification their fluxes within watersheds, and the critical zone; and (III) the fate of these contaminants: their deposition and, consequently, their accumulation.

We encourage submissions examining all aspects of EPs' biogeochemical fate and speciation, especially nanoparticles/colloids, trace elements, metal ions, and/or treatment strategies. We are interested in laboratory and pilot-scale experiments and field characterization/trials.

The presence of metal traces/impurities in carbonate minerals of abiotic (e.g. speleothems, travertines, lacustrine sediments) or biotic (e.g. forams, corals, coccolithophores) origin have been routinely used over the last decades as paleoenvironmental proxies. These proxies can provide information on the chemical composition of seawater and atmosphere at the time of mineral formation thereby providing insights about Earth's past. They can shed light on the mechanisms and rates of past CaCO₃ formation and provide insights into past atmospheric CO₂ levels, paleoweathering, paleotemperature, seawater pH and chemical composition, etc. Due to the recent ability to measure very low metal concentrations in natural carbonate samples, and more importantly their stable isotope compositions, a number of proxy tools based on the chemical and isotopic composition of trace metals in carbonate minerals have been developed. In this session we invite contributions on improving and/or developing paleoenvironmental reconstruction based on metal traces/impurities in carbonates. We encourage contributions from diverse approaches: natural sample measurements, experimental work, in vivo studies of CaCO₃ producing organisms, and computational models.

Particle-reactive metals such as rare earth elements (REE), thorium (Th), mercury (Hg) etc. and their isotopes are powerful tracers for investigating the ocean biogeochemical cycles and can be applied to track e.g. continental weathering input, transport of water mass and particle flux, and anthropogenic emissions. For their robust applications across space and time, it is crucial to obtain a comprehensive understanding of the physical-chemical processes controlling the behaviors of individual particle-reactive elements; the emphasis is on exchange at ocean interfaces via e.g. rivers, atmospheric fallout and benthic dynamics and on internal cycling via e.g. scavenging and remineralization. Such knowledge based on the modern ocean can: 1) help resolve the long-standing debate arising from conflicting records of multiple particle-reactive isotopic systems in the geological past; 2) predict how anthropogenic emission and climate change scenarios will affect the cycling of key trace metals (e.g. toxic monomethylmercury; MMHg) in marine ecosystems.

This session invites observational, experimental and modelling contributions on the distribution, speciation, flux and controls of particle-reactive metals from estuaries to open ocean, with a particular interest in the interaction between seawater/porewater (including colloids) and lithogenic/biogenic particles. Multi-disciplinary and multi-proxy studies and contributions on advances in geochemical proxy development and in determination of metal speciation are especially welcome. This session focuses on processes and fluxes in the modern oceans, but submissions on paleo-oceanographic and paleo-environmental reconstructions are also welcome. Early career scientists are particularly encouraged to contribute to this session.

Seafloor hydrothermal systems have profoundly influenced the chemistry, biology, and oxidation state of Earth’s lithosphere-hydrosphere-atmosphere system throughout Earth history. Atempts to correlate seafloor hydrothermal processes with biological evolution, global elemental budgets, and global redox states throughout Earth history generally require interdisciplinary studies that integrate perspectives from modern analogues, extrapolations of the geologic record, novel laboratory experiments, and numerical models.

In this session, we intend to host a forum for presenting and integrating these various sets of observations in order to focus the community’s efforts on answering key questions regarding chemical budgets and oxidation states on modern and ancient Earth. We welcome studies from ancient and modern ore forming systems formed in seafloor environments, namely volcanogenic and seafloor massive sulphides (VMS and SMS), polymetallic nodules, cobalt-rich ferromanganese crusts, metalliferous sediments, phosphorites in continental margins and REE-rich muds. Contributions focusing on direct measurements of hydrothermal systems (recovered oceanic drill core, obducted oceanic lithosphere) or equivalent proxy records in ancient sedimentary rocks are particularly welcomed. Additional focus includes metal and sulfur hydrothermal fluxes, (bio)geochemical interactions during alteration of the igneous oceanic crust and its contributions to global geologic cycles, the contribution of submarine volcanism to the oxidation state of the early Earth and changes in ocean chemistry associated with the relative balance of continental weathering.

The Mesozoic and Cenozoic Eras (the last 252 million years) were host to profound and coupled changes in Earth's climate, carbon cycle, marine redox state, ocean circulation, surface biogeochemical dynamics, productivity, and global ecology. This session seeks to bring together researchers studying connections among such changes in the Earth system, using the Mesozoic and Cenozoic as a case study in which to explore links between the lithosphere, hydrosphere, atmosphere, and biosphere. We welcome submissions across a broad range of spatial scales, approaches, sample types, and disciplines that address connections between the long-term changes that occurred during the Mesozoic and Cenozoic, or that use Mesozoic and Cenozoic climate change to elucidate the positive and negative feedbacks which preserve planetary habitability across geologic time.

“Ua mau ke ea o ka ʻāina i ka pono.” 

 “The life of the land is perpetuated in righteousness.”

First uttered by King Kamehameha III upon the restoration of sovereignty to the Hawaiian people in 1843, this phrase, which is now the motto of the State of Hawaiʻi. An authentic understanding of  all the layers of meaning of this phrase,require an understanding of the unique relationship Native Hawaiians have with the land. Native Hawaiians both revere the land and sea and respect the need to care for it. They work to strike a balance between the needs of the land and sea and the needs of the creatures living on Earth, including humans. This session will explore Earth from land to sea and the interactions between human resource needs, resource management and Earth conservation in view of current and future challenges as well as creative ways to communicate these interactions.

Fire is a ubiquitous natural disturbance that affects 3–4% of the Earth's surface each year. It is a tool used by humans for land clearing and burning of agricultural wastes. Many Goals of the United Nations Sustainable Development Goals (SDGs) are affected by fires.  In this session we will learn about the interactions between firs and water, using indigenous knowledge for fire management and discuss climate effects and feedbacks of fire and beneficial and adverse consequences of fires on ecosystem services.   

The trade winds are fundamental to the climate of Hawaiʻi, creating the dense cloud banks that surround the ridge tops in Hawaiʻi. But climate change in the past four decades may have caused a significant decline of northeast trade winds resulting in record breaking heat, influencing the different environments from makai to mauka and people residing at both the windward to leeward sides of the Islands. In this session we will talk about changes and the dynamic world of living things in Hawaii’s culture, discuss harnessing indigenous knowledge for sustainability and related environmental justice issues as well as nature-based solutions to combat climate change.

The Hawaiians called freshwater wai and considered it to be sacred. People using wai from streams took only what was absolutely necessary. They were expected to share the wai with others. The Hawaiian word waiwai – a reduplication of the term for water – meant wealth, reflecting the literal seat of riches in Hawaiian society. The importance of water shaped ancient laws and justice. As the world population increases, the issue of using freshwater resources efficiently becomes more important. This session will be dedicated to learning about water in the Hawaiian tradition present and the worlds water uses, water scarcity, security, and equity as well as what it takes to be a water literate citizen.

In Native Hawaiian ancestral science the study of the heavens and everything above our heads that exist in the atmosphere and beyond and the data recorded regarding this information is Papahulilani. In this session we will hear about how Papahulilani is reflected in indigenous conservation practices and hear about best practice for utilizing indigenous knowledge in partnerships for sustainability. We will also discuss the ethical implications of the colonization, privatization, and commercialization of outer space and how to tap into peoples’ natural curiosity to engage with the public.