气候变化领域集成服务门户(CCPortal): A paleosol record of the evolution of Cr redox cycling and evidence for an increase in atmospheric oxygen during the Neoproterozoic

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DOI	10.1111/gbi.12360
	A paleosol record of the evolution of Cr redox cycling and evidence for an increase in atmospheric oxygen during the Neoproterozoic
	Colwyn D.A.; Sheldon N.D.; Maynard J.B.; Gaines R.; Hofmann A.; Wang X.; Gueguen B.; Asael D.; Reinhard C.T.; Planavsky N.J.
发表日期	2019
ISSN	14724677
起始页码	579
结束页码	593
卷号	17 期号:6
英文摘要	Atmospheric oxygen levels control the oxidative side of key biogeochemical cycles and place limits on the development of high-energy metabolisms. Understanding Earth's oxygenation is thus critical to developing a clearer picture of Earth's long-term evolution. However, there is currently vigorous debate about even basic aspects of the timing and pattern of the rise of oxygen. Chemical weathering in the terrestrial environment occurs in contact with the atmosphere, making paleosols potentially ideal archives to track the history of atmospheric O2 levels. Here we present stable chromium isotope data from multiple paleosols that offer snapshots of Earth surface conditions over the last three billion years. The results indicate a secular shift in the oxidative capacity of Earth's surface in the Neoproterozoic and suggest low atmospheric oxygen levels (<1% PAL pO2) through the majority of Earth's history. The paleosol record also shows that localized Cr oxidation may have begun as early as the Archean, but efficient, modern-like transport of hexavalent Cr under an O2-rich atmosphere did not become common until the Neoproterozoic. © 2019 John Wiley & Sons Ltd
关键词	Archean chemical weathering chromium heterocyclic oxygen compound oxygen oxygenation paleosol Proterozoic redox conditions terrestrial environment chromium oxygen atmosphere chemistry Ontario oxidation reduction reaction paleontology soil South Africa United States Atmosphere Chromium Isotopes Ontario Oxidation-Reduction Oxygen Paleontology Soil South Africa United States
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133220
推荐引用方式 GB/T 7714	Colwyn D.A.,Sheldon N.D.,Maynard J.B.,et al. A paleosol record of the evolution of Cr redox cycling and evidence for an increase in atmospheric oxygen during the Neoproterozoic[J]. Geobiology,2019,17(6).
APA	Colwyn D.A..,Sheldon N.D..,Maynard J.B..,Gaines R..,Hofmann A..,...&Planavsky N.J..(2019).A paleosol record of the evolution of Cr redox cycling and evidence for an increase in atmospheric oxygen during the Neoproterozoic.,17(6).
MLA	Colwyn D.A.,et al."A paleosol record of the evolution of Cr redox cycling and evidence for an increase in atmospheric oxygen during the Neoproterozoic".17.6(2019).