Barite Accumulation Rates and Analysis of Sulfur Isotopes over the Paleocene Eocene Thermal Maximum
Abstract/Contents
- Abstract
- The Paleocene Eocene Thermal Maximum (PETM) was a global climatic event that occurred 55 million years ago. D18O values from benthic foraminifera indicate that temperatures rose 4-5C coeval with a precipitous drop in d13C values that indicate a new source of carbon rapidly entered the global carbon cycle. Marine barite (BaSO4) was used to evaluate the 1) barite accumulation rate that serves a proxy for export production and 2) the sulfur isotopic composition of seawater that reflects the mass balance of oceanic sulfate (SO4 2-). Increased barite accumulation rates at the PETM suggest that increased export production and CO2 sequestration was in direct response to the change in carbon source, although not all of the increases are accounted for. High resolution d34S values are lower but within reasonable range of previously observed values and indicate a decrease in sulfate removal by pyrite deposition.
Description
| Type of resource | text |
|---|---|
| Date created | May 2006 |
Creators/Contributors
| Author | Gray, Ellen Theresa |
|---|---|
| Primary advisor | Paytan, Adina |
| Advisor | Arrigo, Kevin |
| Degree granting institution | Stanford University, Department of Geological and Environmental Sciences |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Subject | paleoclimatology |
| Genre | Thesis |
Bibliographic information
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- Use and reproduction
- Theses courtesy of Stanford University Libraries. If you have questions, please contact the Branner Earth Science Library & Map Collections at brannerlibrary@stanford.edu.
Preferred citation
- Preferred Citation
- Gray, Ellen Theresa. (2006). Barite Accumulation Rates and Analysis of Sulfur Isotopes over the Paleocene Eocene Thermal Maximum. Stanford Digital Repository. Available at: http://purl.stanford.edu/ng645bt3230
Collection
Undergraduate Honors Theses, Doerr School of Sustainability
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