For the conveners

								     Daniel Harlov

Dear Colleagues, We cordially invite you to submit an abstract to our session entitled “Geofluids in the crust: from fluid properties to ore formation” with co-convenors: Alexander Gysi (NMT), Daniel Harlov (GFZ), Pilar Lecumberri-Sanchez (U. Alberta), Artaches Migdissov (LANL), Matthew Steele-MacInnis (U. Alberta), Anthony Williams-Jones (McGill U.) Session Title: 05j Geofluids in the crust: from fluid properties to ore formation Theme: Theme 05: Energy, Resources, and the Environment https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8989 Session Description: Subsurface fluids are crucial for element mobilization and fractionation in the Earth’s crust and drive rock metasomatism and ore-forming processes in many geological systems. These fluids circulate and interact with rocks over a wide temperature and pressure range, leading to a significant diversity in physical and chemical properties that need to be understood across scales. Ore-forming fluids can span an enormous range of compositions, from relatively dilute aqueous solutions throughto complex solutions and to an array of melts (e.g. carbonate, sulfide, sulfate and/or halide). This session aims to showcase the diversity of ore-forming fluids and fluid-driven processes across various mineral deposits, from well-known systems with emerging insights to novel and enigmatic deposits where our understanding is still evolving. We welcome new developments in geochemical modeling, phase equilibria modeling, thermodynamic databases, in situspectroscopy, trace elements, isotopic work, and geochemical analysis of natural minerals across scales to understand element behavior in crustal fluids and mineral deposits. We invite contributions that quantify geochemical processes across relevant P–T–X ranges, emphasizing robust thermodynamic and activity-coefficient treatments, experimental constraints on solubility, complex stability, and partitioning, and first-principles modeling that resolves hydration structures, complexation, redox energetics, surface complexation, adsorption, and nucleation pathways. For the conveners Daniel Harlov Daniel Harlov Section 3.1 Inorganic and Isotope Geochemistry GFZ Helmholtz Centre for Georesearch Brandenburg Telegrafenberg 14473 Potsdam Germany international tel +49 (331) 6264-1456 email: dharlov@gfz.de