Full session description:

Fluid flow within geologic structures has implications for the behavior of faults, ore mineralization, sedimentary basin evolution, subsurface microbial life, mantle-lithosphere interaction, the evolution of the atmosphere, and the exchange of volatiles between Earth’s geochemical reservoirs. Crustal fluids liberate and transport volatile species and trace elements (e.g., CO2, H2O, hydrogen, helium, nitrogen, sulphate, trace metals). Fluids and rocks affected by interaction with fluids are important exploration targets for industrial applications such as hydrogen and helium exploration, geological CO2 storage, nuclear waste disposal, metallogeny, and ore extraction.

Despite their importance, crustal fluids are complicated to characterize as their signatures often reflect a multitude of different chemical and physical processes. In addition, paleofluids are usually absent or preserved only in small inclusions, and they frequently leave incomplete or path-dependent signatures on the rocks that they affect.

This session aims to explore the application of geochronology, thermobarometry, biomarker proxies, elemental and isotopic tracers (including triple-oxygen and clumped isotope thermometry), noble gases, and other geochemical tools for understanding the timing, origins, migration and storage of crustal fluids and their impact on the rock record. We welcome contributions that emphasize the importance of geological considerations (tectonics, structures). We also encourage field-based geochemical studies of crustal fluids on domains like rheology, mass and heat transfers, behavior of geochronological systems, and metallogeny in all geological and orogenic settings. We invite studies of modern crustal fluid (e.g., hydrothermal, crystalline basement, basin) and paleofluid (e.g. fluid inclusions, hydrous phases, precipitates, ore minerals) hydrogeological systems.

Hope to see you in Lyon,

Best wishes,

Stephen Cox, Philippe Boulvais, Lydia Bailey, Ruta Karolyte, Rebecca Tyne, Yann Rolland