DOI: 10.1111/gbi.12091
Scopus记录号: 2-s2.0-84906087963
论文题名: Redox heterogeneity of subsurface waters in the Mesoproterozoic ocean
作者: Sperling E.A. ; Rooney A.D. ; Hays L. ; Sergeev V.N. ; Vorob'eva N.G. ; Sergeeva N.D. ; Selby D. ; Johnston D.T. ; Knoll A.H.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2014
卷: 12, 期: 5 起始页码: 373
结束页码: 386
语种: 英语
Scopus关键词: calcareous alga
; depositional environment
; euxinic environment
; heterogeneity
; microfossil
; oligotrophic environment
; paleoceanography
; Proterozoic
; pyrite
; redox conditions
; rhenium-osmium dating
; water chemistry
; Russian Federation
; Eukaryota
; iron
; organic compound
; pyrite
; sea water
; sulfide
; sulfur
; trace element
; astronomy
; chemistry
; oxidation reduction reaction
; Russian Federation
; Evolution, Planetary
; Iron
; Organic Chemicals
; Oxidation-Reduction
; Russia
; Seawater
; Sulfides
; Sulfur Isotopes
; Trace Elements
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: A substantial body of evidence suggests that subsurface water masses in mid-Proterozoic marine basins were commonly anoxic, either euxinic (sulfidic) or ferruginous (free ferrous iron). To further document redox variations during this interval, a multiproxy geochemical and paleobiological investigation was conducted on the approximately 1000-m-thick Mesoproterozoic (Lower Riphean) Arlan Member of the Kaltasy Formation, central Russia. Iron speciation geochemistry, supported by organic geochemistry, redox-sensitive trace element abundances, and pyrite sulfur isotope values, indicates that basinal calcareous shales of the Arlan Member were deposited beneath an oxygenated water column, and consistent with this interpretation, eukaryotic microfossils are abundant in basinal facies. The Rhenium-Osmium (Re-Os) systematics of the Arlan shales yield depositional ages of 1414 ± 40 and 1427 ± 43 Ma for two horizons near the base of the succession, consistent with previously proposed correlations. The presence of free oxygen in a basinal environment adds an important end member to Proterozoic redox heterogeneity, requiring an explanation in light of previous data from time-equivalent basins. Very low total organic carbon contents in the Arlan Member are perhaps the key-oxic deep waters are more likely (under any level of atmospheric O2) in oligotrophic systems with low export production. Documentation of a full range of redox heterogeneity in subsurface waters and the existence of local redox controls indicate that no single stratigraphic section or basin can adequately capture both the mean redox profile of Proterozoic oceans and its variance at any given point in time. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85182
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Earth Sciences, Durham University, Durham, United Kingdom; Geological Institute, Russian Academy of Sciences, Moscow, Russian Federation; Institute of Geology, Ufimian Scientific Center, Russian Academy of Sciences, Ufa, Russian Federation
Recommended Citation:
Sperling E.A.,Rooney A.D.,Hays L.,et al. Redox heterogeneity of subsurface waters in the Mesoproterozoic ocean[J]. Geobiology,2014-01-01,12(5)