Dear Colleagues, On behalf of my co-conveners Drew Syverson and Wenhao Wang, I invite you to please consider submitting an abstract to 12g - Seafloor hydrothermal processes and their impacts on the modern and ancient Earth<https://conf.goldschmidt.info/goldschmidt/2025/meetingapp.cgi/Session/7698> (session description pasted below). The 2024 Goldschmidt Conference will take place in Prague, Czech Republic, 6-11 July, and the abstract deadline is 26 February 2025. I hope that we can continue the tradition of this session as a forum for compelling hydrothermal geochemistry at the Goldschmidt conference. I look forward to seeing many of you there! Best regards, Ben, Drew, and Wenhao 12g - Seafloor hydrothermal processes and their impacts on the modern and ancient Earth Seafloor hydrothermal systems have profoundly influenced Earth’s biosphere, lithosphere, hydrosphere, and atmosphere throughout Earth history and serve as crucial pathways for the transfer of materials and energy between the lithosphere and the exosphere (biosphere, hydrosphere, and atmosphere) today. Nonetheless, hydrothermal systems’ nature within the oceanic crust drastically limits the temporal extent of direct geologic observations of their existence. Thus, attempts to correlate seafloor hydrothermal processes with biological evolution, global elemental budgets, and global redox states throughout Earth history generally require interdisciplinary efforts that integrate studies of modern systems, interpretations of the geologic record, novel laboratory experiments, and numerical models. Specific focuses could include the role of seafloor hydrothermalism in carbon and other elemental cycles, studies of the linkages between high and low temperature hydrothermal alteration, crustal mineralogy, and seawater geochemistry, and the relation between hydrothermal systems and the tempos and milestones of biological evolution. Submissions from early career researchers are especially welcome. Keynote Speaker: Dr. John Jamieson, Memorial University Newfoundland Associate Professor Department of Earth, Energy, and Environment University of Calgary 550 Earth Sciences, 2500 University Dr NW Calgary, AB T2N 1N4 Canada https://www.ucalgary.ca/reactive-transport/research