Dear colleagues, We are excited to announce our upcoming session at Goldschmidt 2026 and warmly invite you to contribute an abstract. Session information and submission link: <https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8992> https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8992 Title: Serpentinites from Deep Earth and Beyond: Geochemical Cycles, Life and a Sustainable Future (Session 03c) Session Description: Serpentinites play a pivotal role in Earth’s geochemical and geological systems, with growing relevance for sustainability and planetary science. They influence, among others, mantle melting at subduction zones and drive mass and energy transfer across the lithosphere, hydrosphere, and biosphere. The unique mineral assemblages and associated fluid chemistry changes during their formation, namely serpentinization, are central to the chemical evolution of the lithosphere. A key product of serpentinization is molecular hydrogen, which not only participates in abiotic organic synthesis but also serves as an energy source for chemosynthetic life, suggesting implications for the origin of life on Earth and potentially other planets. Serpentinites also offer practical benefits for climate and energy solutions. They naturally sequester CO₂ through mineral carbonation, contributing to carbon capture strategies. Additionally, the hydrogen released during serpentinization is being explored as a large-scale, natural resource. These rocks are also linked to critical metal deposits essential for a low-carbon economy. In this session, we encourage interdisciplinary dialogue on all facets of this complex metasomatic process, from field-based investigations of ancient and modern serpentinite formations to laboratory experiments, numerical modelling, and cutting-edge analytical developments seeking a deeper understanding of serpentinization and its broad (bio)geochemical implications. Topics may include, but are not limited to, fluid and element mobilization, hydrogen generation, carbon sequestration, and the feedbacks between fluid-rock interactions and global geochemical cycles. Contributions from continental and ocean drilling programs are especially welcome, as are insights into the role of serpentinites in supporting early life and providing valuable metal resources. Melanie Sieber- on behalf of all conveners (M. R. Scicchitano (GFZ), Qi Fu (Uni Houston); H. Liu (Chinese Academy of Sciences); J.C. de Obeso (Uni Utah); F.D.H. Wilke (GFZ); M.J. Sieber (TU Berlin)) -- Prof. Dr. M. J. Sieber (she/her) TU Berlin - Institut für Angewandte Geowissenschaften Angewandte Geochemie terrestrischer Systeme Ernst-Reuter-Platz 1 BH-N 9.OG 903 D-10587 Berlin +4930314-28912