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Absence of hexavalent chromium in marine carbonates: implications for chromium isotopes as paleoenvironment proxy
BSRF用户
2021
Source PublicationNATIONAL SCIENCE REVIEW
ISSN2095-5138
EISSN2053-714X
Volume8Issue:3Pages:nwaa090
SubtypeArticle
AbstractThe oxygenation of Earth's atmosphere is widely regarded to have played an important role in early-life evolution. Chromium (Cr) isotopes recorded in sedimentary rocks have been used to constrain the atmospheric oxygen level (AOL) over geological times based on the fact that a positive Cr isotopic signature is linked to the presence of Cr(VI) as a result of oxidative continental weathering. However, there is no direct evidence of the presence of Cr(VI) in sedimentary rocks yet. Carbonates are most widely distributed over geological times and were thought to have incorporated Cr(VI) directly from seawater. Here, we present results of Cr valence states in carbonates which show Cr(III) is the dominant species in all samples spanning a wide range of geological times. These findings indicate that Cr(VI) in seawater was reduced either before or after carbonate precipitation, which might have caused Cr isotopic fractionation between seawater and carbonates, or marine carbonates preferentially uptake Cr(III) from seawater. As Cr(III) can come from non-redox Cr cycling, which also can cause isotopic fractionation, we suggest that positively fractionated Cr isotopic values do not necessarily correspond to the rise in AOL.
DOI10.1093/nsr/nwaa090
Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000649002700002
ItemNoBSRF00920
beamline1W1B
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/293688
Collection北京同步辐射装置
Recommended Citation
GB/T 7714
BSRF用户. Absence of hexavalent chromium in marine carbonates: implications for chromium isotopes as paleoenvironment proxy[J]. NATIONAL SCIENCE REVIEW,2021,8(3):nwaa090.
APA BSRF用户.(2021).Absence of hexavalent chromium in marine carbonates: implications for chromium isotopes as paleoenvironment proxy.NATIONAL SCIENCE REVIEW,8(3),nwaa090.
MLA BSRF用户."Absence of hexavalent chromium in marine carbonates: implications for chromium isotopes as paleoenvironment proxy".NATIONAL SCIENCE REVIEW 8.3(2021):nwaa090.
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