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Dear All,
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<div class="">I apologize for the extra email here, but wanted to make everyone aware of the room change for today’s seminar, which will now be in
<b class="">EOA 1044</b>.</div>
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<div class="">Cheers,</div>
<div class="">Seth Young</div>
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<div class=""><u class="">Date:</u> April 28th</div>
<div class=""><u class="">Time:</u> 3pm</div>
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<div class=""><b class=""><u class="">Location:</u> EOA 1044</b></div>
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<div class=""><u class="">Speaker</u>: Dr. Matthew Saltzman from The Ohio State University</div>
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<div class=""><u class="">Title:</u> <i class="">What can the carbon isotopic composition of ancient shallow water carbonates tell us? New insights from calcium isotopes</i></div>
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<div class=""><u class="">Abstract:</u> 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.</div>
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