DOI: 10.1016/j.epsl.2019.116056
论文题名: Local environmental variation obscures the interpretation of pyrite sulfur isotope records
作者: Lang X. ; Tang W. ; Ma H. ; Shen B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 533 语种: 英语
英文关键词: local biogeochemical cycles
; pyrite
; sulfur cycle
; sulfur isotope
Scopus关键词: Biogeochemistry
; Ecology
; Isotopes
; Sulfur
; Biogeochemical cycle
; Environmental variations
; Organic matter content
; Redox condition
; Secular variation
; Sedimentation rates
; Sulfur cycles
; Sulfur isotope
; Pyrites
; biogeochemical cycle
; paleoceanography
; Proterozoic
; pyrite
; redox conditions
; seafloor
; secular variation
; sulfur isotope
英文摘要: Theoretically, within the long-term marine sulfur cycle, pyrite sulfur isotopes (δ34Spy) are determined by the degree of pyrite burial that is controlled by the marine redox conditions. Thus, the secular variation of δ34Spy records the history of marine and atmosphere redox evolution. As such, large magnitude change in δ34Spy in the Proterozoic has been attributed to widespread oceanic anoxia related to generally low atmospheric pO2 levels. However, noisy δ34Spy signals in the past 250 million years cannot be explained by the frequent oscillation of seawater redox, because the global ocean was already fully oxidized. Here, by developing a numerical model, we show that δ34Spy of syndepositional pyrite is significantly affected by local factors, such as organic matter content in sediment, sedimentation rate, and seafloor redox. Thus, the noisy δ34Spy records may reflect local environmental variations rather than the oscillation of global ocean redox. Our study also suggests that δ34Spy alone cannot provide a robust constraint on the global or local ocean redox condition. We suggest that, combining with the pyrite content data and δ34Spy can help quantify local/regional biogeochemical cycles. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159054
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation & Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, 610059, China; Key Laboratory of Orogenic Belts and Crustal Evolution, MOE & School of Earth and Space Sciences, Peking University, Beijing, 100871, China; School of Mathematical & Statistical Sciences, Arizona State University, Tempe, AZ 85287, United States
Recommended Citation:
Lang X.,Tang W.,Ma H.,et al. Local environmental variation obscures the interpretation of pyrite sulfur isotope records[J]. Earth and Planetary Science Letters,2020-01-01,533