The carbonate-rich Site U1553 presents an opportunity to constrain seawater carbonate chemistry during the Paleogene using a multi-proxy approach. In the Jacobson Laboratory at Northwestern University (NU), I have been trained in the analysis and interpretation of traditional and non-traditional isotope systems, including stable calcium (δ44/40Ca), as well as radiogenic and stable strontium (87Sr/86Sr and δ88/86Sr). Prof. Andrew Jacobson will serve as my Northwestern faculty PI for this proposal. During the 15-month post-cruise research period, I propose to analyze the Ca and Sr isotope composition of bulk carbonate and calcareous microfossils recovered from Site U1553. Application of the δ44/40Ca, 87Sr/86Sr, and δ88/86Sr tracers to the recovered samples can help elucidate the causes and consequences of extreme climate change during the Paleogene, such as the Paleocene-Eocene Thermal Maximum (PETM) ocean acidification (OA) event. The Ca and Sr isotopic systems are also sensitive to diagenetic alteration in unique ways that can be carefully exploited to assess preservation of primary and secondary signals.
|Effective start/end date
|12/1/20 → 5/31/22
- Columbia University (71C(GG009393-04) // OCE-1450528)
- National Science Foundation (71C(GG009393-04) // OCE-1450528)
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