气候变化领域集成服务门户(CCPortal): Palaeoproterozoic oxygenated oceans following the Lomagundi

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DOI	10.1038/s41561-020-0558-5
	Palaeoproterozoic oxygenated oceans following the Lomagundi–Jatuli Event
	Mänd K.; Lalonde S.V.; Robbins L.J.; Thoby M.; Paiste K.; Kreitsmann T.; Paiste P.; Reinhard C.T.; Romashkin A.E.; Planavsky N.J.; Kirsimäe K.; Lepland A.; Konhauser K.O.
发表日期	2020
ISSN	17520894
起始页码	302
结束页码	306
卷号	13 期号:4
英文摘要	The approximately 2,220–2,060 million years old Lomagundi–Jatuli Event was the longest positive carbon isotope excursion in Earth history and is traditionally interpreted to reflect an increased organic carbon burial and a transient rise in atmospheric O2. However, it is widely held that O2 levels collapsed for more than a billion years after this. Here we show that black shales postdating the Lomagundi–Jatuli Event from the approximately 2,000 million years old Zaonega Formation contain the highest redox-sensitive trace metal concentrations reported in sediments deposited before the Neoproterozoic (maximum concentrations of Mo = 1,009 μg g−1, U = 238 μg g−1 and Re = 516 ng g−1). This unit also contains the most positive Precambrian shale U isotope values measured to date (maximum 238U/235U ratio of 0.79‰), which provides novel evidence that there was a transition to modern-like biogeochemical cycling during the Palaeoproterozoic. Although these records do not preclude a return to anoxia during the Palaeoproterozoic, they uniquely suggest that the oceans remained well-oxygenated millions of years after the termination of the Lomagundi–Jatuli Event. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	biogeochemical cycle; Cambrian; carbon isotope; concentration (composition); organic carbon; oxygen; Proterozoic; trace metal
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206809
作者单位	Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada; Department of Geology, University of Tartu, Tartu, Estonia; CNRS–UMR6538 Laboratoire Géosciences Océan, European Institute for Marine Studies, Plouzané, France; Department of Geology & Geophysics, Yale University, New Haven, CT, United States; CAGE—Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Tromsø, Norway; School of Earth and Atmospheric Sciences, Georgia Tech, Atlanta, GA, United States; NASA Astrobiology Institute Alternative Earths Team, University of California, Riverside, CA, United States; Institute of Geology, Karelian Science Centre, Petrozavodsk, Russian Federation; Geological Survey of Norway (NGU), Trondheim, Norway; Department of Geology, Tallinn University of Technology, Tallinn, Estonia
推荐引用方式 GB/T 7714	Mänd K.,Lalonde S.V.,Robbins L.J.,等. Palaeoproterozoic oxygenated oceans following the Lomagundi–Jatuli Event[J],2020,13(4).
APA	Mänd K..,Lalonde S.V..,Robbins L.J..,Thoby M..,Paiste K..,...&Konhauser K.O..(2020).Palaeoproterozoic oxygenated oceans following the Lomagundi–Jatuli Event.Nature Geoscience,13(4).
MLA	Mänd K.,et al."Palaeoproterozoic oxygenated oceans following the Lomagundi–Jatuli Event".Nature Geoscience 13.4(2020).