DOI: 10.1016/j.earscirev.2020.103230
论文题名: Identifying global vs. basinal controls on Paleoproterozoic organic carbon and sulfur isotope records
作者: Paiste K. ; Lepland A. ; Zerkle A.L. ; Kirsimäe K. ; Kreitsmann T. ; Mänd K. ; Romashkin A.E. ; Rychanchik D.V. ; Prave A.R.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 207 语种: 英语
中文关键词: Carbon cycle
; Great Oxidation Event
; Ocean redox
; Onega Basin
; Paleoproterozoic
; Sulfur cycle
英文关键词: basin evolution
; biogeochemical cycle
; organic carbon
; oxygenation
; paleoceanography
; paleoclimate
; paleoenvironment
; Proterozoic
; redox conditions
; stratigraphy
; sulfur isotope
; Arkhangelsk [Russian Federation]
; Onega Basin
; Russian Federation
英文摘要: Paleoproterozoic sedimentary successions are important archives of the redox evolution of Earth's atmosphere and oceans. Efforts to unravel the dynamics of our planet's early oxygenation from this archive rely on various geochemical proxies, including stable carbon and sulfur isotopes. However, ancient metasedimentary rocks often experienced early- and late-stage (bio)geochemical processes making it difficult to discern primary environmental signals from bulk-rock δ13Corg and δ34S values. Such complexity in carbon and sulfur isotope systematics contributes to uncertainty about the redox structure of Paleoproterozoic oceans. A currently popular idea is that, following the Great Oxidation Event, global changes led to low-oxygen environments and temporally fluctuating ocean redox conditions that lasted until the Neoproterozoic. The volcano-sedimentary rocks of the Onega Basin have figured prominently in this concept, particularly the exceptionally organic-rich rocks of the 1.98 Ga Zaonega Formation. However, a growing body of evidence shows that local depositional processes acted to form the δ13Corg and pyrite δ34S records of the Zaonega Formation, thus calling for careful assessment of the global significance of these isotope records. Placing new and existing organic carbon and sulfur isotope data from the Zaonega Formation into the context of basin history and by comparing those results with key Paleoproterozoic successions of the Francevillian Basin (Gabon), the Pechenga Greenstone Belt (NW Russia) and the Animikie Basin (Canada), we show that the stratigraphic δ13Corg and pyrite δ34S trends can be explained by local perturbations in biogeochemical carbon and sulfur cycling without requiring global drivers. Despite their temporal disparity, we also demonstrate that individual successions share certain geological traits (e.g. magmatic and/or tectonic activity, hydrocarbon generation, basin restriction) suggesting that their pyrite δ34S and δ13Corg trends were governed by common underlying mechanisms (e.g. similar basinal evolution and biogeochemical feedbacks) and are not necessarily unique to certain time intervals. We further show that pyrites in these successions that are most likely to capture ambient seawater sulfate isotopic composition have consistent δ34S values of 15–18‰, which hints at remarkable stability in the marine sulfur cycle over most of the Paleoproterozoic Era. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166205
Appears in Collections: 气候变化与战略
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作者单位: CAGE—Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Tromsø, 9037, Norway; Geological Survey of Norway (NGU), Trondheim, 7491, Norway; Department of Geology, University of Tartu, Tartu, 50411, Estonia; School of Earth and Environmental Sciences and Centre for Exoplanet Science, University of St Andrews, St Andrews, Scotland KY16 9AL, United Kingdom; Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada; Institute of Geology, Karelian Science Centre, Pushkinskaya 11, Petrozavodsk, 185610, Russian Federation
Recommended Citation:
Paiste K.,Lepland A.,Zerkle A.L.,et al. Identifying global vs. basinal controls on Paleoproterozoic organic carbon and sulfur isotope records[J]. Earth Science Reviews,2020-01-01,207