[Eoas-seminar] Reminder EOAS Colloquium Today– Dr. Matthew Saltzman

[eoas-seminar at lists.fsu.edu]

Dear All,

Please join us this afternoon April 28th for the final EOAS Colloquium of Spring 2023 given by Dr. Matthew Saltzman.

Date: April 28th
Time: 3pm
Location: EOA 1050
Speaker: Dr. Matthew Saltzman from The Ohio State University

Title: What can the carbon isotopic composition of ancient shallow water carbonates tell us? New insights from calcium isotopes

Abstract: The carbon isotopic composition of marine carbonate has a long history of usage as a proxy for the global carbon cycle. Because pelagic carbonate is not widely available in pre-Mesozoic times, carbon isotopes must be measured in shallow water carbonates. Global changes in carbon isotopes of shallow water carbonates are unambiguously identified, but links to carbon cycle drivers remain controversial. The roles of early marine diagenesis and carbonate mineralogy (aragonite versus calcite) in carbon isotope excursions have been challenging to tease apart from global C cycling, and recent developments in calcium isotope measurements offers a new way to look at these old questions. Our recent work pairing C isotopes with and Ca isotopes and elemental concentrations (particularly Sr) indicates that diagenesis and changes in primary mineralogy cannot explain positive carbon isotope excursions in two Paleozoic intervals including the middle Ordovician (Darriwilian) and early Mississippian (Tournaisian). This suggests that C isotope excursions in shallow water carbonates are best explained in terms of a combination of global and local C cycling.


Dr. Seth A. Young
Associate Professor & Director of FSU Geology Field Camp
Department of Earth, Ocean, & Atmospheric Science
Florida State University
Tallahassee, FL 32306-4520
EOA 5004
sayoung2 at fsu.edu<mailto:sayoung2 at fsu.edu>

http://www.sethallenyoungphd.com/

"Change is not something that we should fear. Rather, it is something that we should welcome. For without change, nothing in this world would ever grow or blossom, and no one in this world would ever move forward to become the person they’re meant to be.”  –B.K.S. Iyengar
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