气候变化领域集成服务门户(CCPortal): Redox-sensitive trace metals as paleoredox proxies: A review and analysis of data from modern sediments

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DOI	10.1016/j.earscirev.2020.103175
	Redox-sensitive trace metals as paleoredox proxies: A review and analysis of data from modern sediments
	Bennett W.W.; Canfield D.E.
发表日期	2020
ISSN	0012-8711
卷号	204
英文摘要	Redox-sensitive trace metals have been used extensively as geochemical proxies to infer the redox-status of marine sediments at the time of their deposition, and by extension, the concentration of oxygen in the overlying water and atmosphere. However, to reliably apply these paleoredox proxies in ancient sediment samples we must calibrate their geochemical behavior in modern sedimentary environments with known redox-status. Here we report a new compilation and analysis of modern trace-metal enrichment data for a range of marine depositional environments, including euxinic basins, continental margin upwelling settings, and normal oxic settings. The enrichments (i.e., concentrations normalized to aluminum content) of vanadium, uranium, molybdenum and rhenium (the VUMoRe database) in the various depositional categories were analyzed using receiver operating characteristic (ROC) curve analysis to systematically identify threshold values that differentiate the various settings. The enrichment of both Mo (> 5 μg g−1/%) and V (> 23 μg g−1/%), but with V not exceeding 46 μg g−1/%, provides strong evidence for a euxinic basin-type depositional environment. Furthermore, the enrichment of V (> 46 μg g−1/%), U (> 5 μg g−1/%) and Mo (> 5 μg g−1/%) is strong evidence for sediments depositing within the anoxic core of perennial OMZ environments, whereas the enrichment of U (> 1 μg g−1/%) coinciding with a low enrichment of V (< 23 μg g−1/%) and Mo (< 5 μg g−1/%) is strong evidence of sediment deposition in the oxic water beneath the core of a perennial OMZ environment. The new method we describe here for determining enrichment thresholds of trace metal-based redox proxies will support the reliable classification of ancient depositional environments and the ongoing development of trace metals as paleoredox proxies. © 2020 Elsevier B.V.
英文关键词	Marine sediment; Molybdenum; Paleoredox; Rhenium; Uranium; Vanadium
语种	英语
scopus关键词	concentration (composition); depositional environment; literature review; marine sediment; molybdenum; rhenium; sediment chemistry; trace element; trace metal; uranium
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209640
作者单位	Nordcee, Department of Biology, University of Southern Denmark, Campusvej 55, Odense M, 5230, Denmark; Environmental Futures Research Institute, School of Environment and Science, Griffith University Gold Coast campusQueensland 4215, Australia
推荐引用方式 GB/T 7714	Bennett W.W.,Canfield D.E.. Redox-sensitive trace metals as paleoredox proxies: A review and analysis of data from modern sediments[J],2020,204.
APA	Bennett W.W.,&Canfield D.E..(2020).Redox-sensitive trace metals as paleoredox proxies: A review and analysis of data from modern sediments.EARTH-SCIENCE REVIEWS,204.
MLA	Bennett W.W.,et al."Redox-sensitive trace metals as paleoredox proxies: A review and analysis of data from modern sediments".EARTH-SCIENCE REVIEWS 204(2020).