Multiple sulfur isotope constraints on the modern sulfur cycle

 Title: Multiple sulfur isotope constraints on the modern sulfur cycle Author: Tostevin, Rosalie; Turchyn, Alexandra V.; Farquhar, James; Johnston, David T; Eldridge, Daniel L.; Bishop, James K.B.; McIlvin, Matthew Note: Order does not necessarily reflect citation order of authors. Citation: Tostevin, Rosalie, Alexandra V. Turchyn, James Farquhar, David T. Johnston, Daniel L. Eldridge, James K.B. Bishop, and Matthew McIlvin. 2014. “Multiple Sulfur Isotope Constraints on the Modern Sulfur Cycle.” Earth and Planetary Science Letters 396 (June): 14–21. doi:10.1016/j.epsl.2014.03.057. Access Status: Full text of the requested work is not available in DASH at this time (“dark deposit”). For more information on dark deposits, see our FAQ. Full Text & Related Files: Tostevin_MultipleSulfur.pdf (753.2Kb; PDF) Abstract: We present 28 multiple sulfur isotope measurements of seawater sulfate $$(δ^{34}S_{SO_{4}} and Δ^{33}S_{SO_4})$$ from the modern ocean over a range of water depths and sites along the eastern margin of the Pacific Ocean. The average measured $$δ^{34}S_{SO_4}$$ is 21.24‰ (±0.88‰,2σ) with a calculated $$Δ^{33}S_{SO_4}$$ of +0.050‰ (±0.014‰,2σ). With these values, we use a box-model to place constraints on the gross fraction of pyrite burial in modern sediments. This model presents an improvement on previous estimates of the global pyrite burial flux because it does not rely on the assumed value of $$δ^{34}S_{pyrite}$$, which is poorly constrained, but instead uses new information about the relationship between $$δ^{34}S$$ and $$δ^{33}S$$ in global marine sulfate. Our calculations indicate that the pyrite burial flux from the modern ocean is between 10% and 45% of the total sulfur lost from the oceans, with a more probable range between 20% and 35%. Published Version: doi:10.1016/j.epsl.2014.03.057 Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:33370041 Downloads of this work: