DOI: 10.1016/j.epsl.2021.117015
论文题名: Quantifying pyrite oxidation on continental shelves during the onset of Antarctic glaciation in the Eocene-Oligocene transition
作者: Yao W. ; Markovic S. ; Paytan A. ; Erhardt A.M. ; Wortmann U.G.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 568 语种: 英语
中文关键词: Eocene-Oligocene transition
; oxygen isotopes
; pyrite oxidation
; sulfate
; sulfur isotopes
英文关键词: Alkalinity
; Glacial geology
; Pyrites
; Sea level
; Seawater
; Sulfur compounds
; Continental shelfs
; Cooling trends
; Eocene-oligocene transition
; Global cooling
; Ocean circulation
; Oligocene
; Oxygen isotopes
; Pyrite oxidation
; Sulfur isotope
; Sulphates
; Isotopes
; alkalinity
; continental shelf
; Eocene-Oligocene boundary
; glaciation
; oxidation
; oxygen isotope
; pH
; pyrite
; seawater
; sulfate
; sulfur cycle
; sulfur isotope
; Antarctica
英文摘要: The Eocene-Oligocene transition (EOT) is characterized by a global cooling trend, falling sea levels, and the onset of Antarctic glaciation. Previous studies investigate the interactions and feedbacks between ocean circulation, weathering, and atmospheric CO2 levels during this time. Here we explore the role of biogeochemical sulfur cycling, and report seawater sulfate isotope data across the EOT. Our data show that seawater sulfate δ34S and δ18OSO4 values decline by 0.6‰ and 1.5‰, respectively, between 34.5 and 33 Ma. Quantitative modeling suggests that approximately 8,000 Gt of the sulfide previously stored in shelf sediments has been reoxidized and transferred to the marine sulfate pool. This reoxidation process proceeds through reactions similar to those associated with acid mine drainage, generating 24,500 Gt sulfuric acid. These numbers are of similar magnitude as those estimated for Pleistocene glaciations and must have affected marine pH and/or alkalinity. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165731
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth Sciences, University of Toronto, Toronto, ON M5S 3B1, Canada; Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, ON M1C 1A4, Canada; Institute of Marine Science, University of California–Santa Cruz, Santa Cruz, CA 95064, United States; Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40508, United States
Recommended Citation:
Yao W.,Markovic S.,Paytan A.,et al. Quantifying pyrite oxidation on continental shelves during the onset of Antarctic glaciation in the Eocene-Oligocene transition[J]. Earth and Planetary Science Letters,2021-01-01,568