BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:Surprise LCLU Coffee Discussion! Eliel Anttila on "\;Volcanige nic mineral-associated organic carbon preservation in marginal marine sedi ments"\; - Eliel Anttila (ETH Geology) DTSTART:20251126T160000Z DTEND:20251126T170000Z UID:TALK239626@talks.cam.ac.uk CONTACT:Paul B. Rimmer DESCRIPTION:In person.\n\n-----\n\nOrganic carbon burial is one of the maj or pathways by which carbon is removed from Earth’s ocean-atmosphere sys tem\, and is a principal process in the determination of Earth’s atmosph eric composition and climate. Studies of modern sediments suggest that muc h of the organic carbon buried in margin-proximal marine basins\, which ho st a major fraction of the global organic carbon burial flux\, is preserve d through physical protection afforded by the close association of buried organic carbon with reactive and high-surface-area minerals. However\, the dominant mechanisms of organic carbon preservation deeper in Earth histor y remain the subject of scientific debate. Here\, I will present new miner alogical\, sedimentological\, and geochemical data from the organic-rich m arginal marine sediments of the Miocene Monterey Formation\, CA\, USA\, wh ich demonstrate that most of the organic carbon preserved in Monterey Form ation shales is intimately associated with a suite of clay and zeolite min erals. Furthermore\, these data suggest that many of the organic-associate d minerals in the Monterey Formation are most-parsimoniously derived from the alteration of volcanic ash\, pointing to a previously underappreciated role for volcanic ash flux in modulating the protection-based preservatio n of organic carbon. Finally\, I will briefly discuss the environments\, d epositional settings\, and time periods in which volcanic ash flux to sedi mentary deposystems may have significantly impacted organic carbon preserv ation and burial throughout Earth history LOCATION:RDC Seminar East END:VEVENT END:VCALENDAR