globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1921308117
论文题名:
Volcanic controls on seawater sulfate over the past 120 million years
作者: Laakso T.A.; Waldeck A.; MacDonald F.A.; Johnston D.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:35
起始页码: 21118
结束页码: 21124
语种: 英语
英文关键词: Biogeochemistry ; Large igneous provinces ; Sulfur
Scopus关键词: barium sulfate ; oxygen ; pyrite ; sea water ; sulfate ; sulfur ; Article ; burial ; chemical structure ; climate ; fractionation ; isotope analysis ; marine biology ; mathematical analysis ; oxygenation ; priority journal ; quantitative analysis ; sea ; sedimentation ; sulfur cycle ; volcano
英文摘要: Changes in the geological sulfur cycle are inferred from the sulfur isotopic composition of marine barite. The structure of the 34S/32S record from the Mesozoic to present, which includes ~50- and 100-Ma stepwise increases, has been interpreted as the result of microbial isotope effects or abrupt changes to tectonics and associated pyrite burial. Untangling the physical processes that govern the marine sulfur cycle and associated isotopic change is critical to understanding how climate, atmospheric oxygenation, and marine ecology have coevolved over geologic time. Here we demonstrate that the sulfur outgassing associated with emplacement of large igneous provinces can produce the apparent stepwise jumps in the isotopic record when coupled to long-term changes in burial efficiency. The record of large igneous provinces map onto the required outgassing events in our model, with the two largest steps in the sulfur isotope record coinciding with the emplacement of large igneous provinces into volatile-rich sedimentary basins. This solution provides a quantitative picture of the last 120 My of change in the ocean's largest oxidant reservoir. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164062
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作者单位: Laakso, T.A., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02139, United States; Waldeck, A., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02139, United States; MacDonald, F.A., Department of Earth Science, University of California, Santa Barbara, CA 93106, United States; Johnston, D., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02139, United States

Recommended Citation:
Laakso T.A.,Waldeck A.,MacDonald F.A.,et al. Volcanic controls on seawater sulfate over the past 120 million years[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(35)
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