globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1917518117
论文题名:
Triple oxygen isotope insight into terrestrial pyrite oxidation
作者: Hemingway J.D.; Olson H.; Turchyn A.V.; Tipper E.T.; Bickle M.J.; Johnston D.T.
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:14
起始页码: 7650
结束页码: 7657
语种: 英语
英文关键词: Atmospheric O2 ; Chemical weathering ; Himalayas ; Sulfur cycle ; ∆0 17O
Scopus关键词: oxygen ; pyrite ; reactive oxygen metabolite ; Article ; atmosphere ; chemical analysis ; chemical reaction kinetics ; concentration (parameter) ; geology ; isotope analysis ; Nepal ; oxidation ; precipitation ; priority journal ; river ; seasonal variation ; troposphere ; weathering
英文摘要: The mass-independent minor oxygen isotope compositions (∆0 17O) of atmospheric O2 and CO2 are primarily regulated by their relative partial pressures, pO2/pCO2. Pyrite oxidation during chemical weathering on land consumes O2 and generates sulfate that is carried to the ocean by rivers. The ∆0 17O values of marine sulfate deposits have thus been proposed to quantitatively track ancient atmospheric conditions. This proxy assumes direct O2 incorporation into terrestrial pyrite oxidation-derived sulfate, but a mechanistic understanding of pyrite oxidation-including oxygen sources-in weathering environments remains elusive. To address this issue, we present sulfate source estimates and ∆0 17O measurements from modern rivers transecting the Annapurna Himalaya, Nepal. Sulfate in high-elevation headwaters is quantitatively sourced by pyrite oxidation, but resulting ∆0 17O values imply no direct tropospheric O2 incorporation. Rather, our results necessitate incorporation of oxygen atoms from alternative, 17O-enriched sources such as reactive oxygen species. Sulfate ∆0 17O decreases significantly when moving into warm, low-elevation tributaries draining the same bedrock lithology. We interpret this to reflect overprinting of the pyrite oxidation-derived ∆0 17O anomaly by microbial sulfate reduction and reoxidation, consistent with previously described major sulfur and oxygen isotope relationships. The geologic application of sulfate ∆0 17O as a proxy for past pO2/pCO2 should consider both 1) alternative oxygen sources during pyrite oxidation and 2) secondary overprinting by microbial recycling. © 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/164262
Appears in Collections:气候变化与战略

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作者单位: Hemingway, J.D., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Olson, H., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Turchyn, A.V., Department of Earth Sciences, Cambridge University, Cambridge, CB2 1TN, United Kingdom; Tipper, E.T., Department of Earth Sciences, Cambridge University, Cambridge, CB2 1TN, United Kingdom; Bickle, M.J., Department of Earth Sciences, Cambridge University, Cambridge, CB2 1TN, United Kingdom; Johnston, D.T., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States

Recommended Citation:
Hemingway J.D.,Olson H.,Turchyn A.V.,et al. Triple oxygen isotope insight into terrestrial pyrite oxidation[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(14)
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