DOI: 10.1016/j.epsl.2018.05.044
Scopus记录号: 2-s2.0-85048005254
论文题名: Mercury anomalies across the end Permian mass extinction in South China from shallow and deep water depositional environments
作者: Wang X. ; Cawood P.A. ; Zhao H. ; Zhao L. ; Grasby S.E. ; Chen Z.-Q. ; Wignall P.B. ; Lv Z. ; Han C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 496 起始页码: 159
结束页码: 167
语种: 英语
英文关键词: bio-crisis
; Hg isotopes
; Meishan GSSP
; Permian–Triassic boundary
; Siberian Traps
; South China
Scopus关键词: Basalt
; Geochemistry
; Organic carbon
; bio-crisis
; Meishan GSSP
; Siberian Traps
; South China
; Triassic
; Isotopes
; deep water
; depositional environment
; isotopic analysis
; isotopic composition
; mass extinction
; mercury (element)
; Permian
; Permian-Triassic boundary
; shallow water
; stable isotope
; volcanism
; China
; Siberia
英文摘要: Life on Earth suffered its greatest bio-crisis since multicellular organisms rose 600 million years ago during the end-Permian mass extinction. Coincidence of the mass extinction with flood basalt eruptions in Siberia is well established, but the exact causal connection between the eruptions and extinction processes in South China is uncertain due to their wide spatial separation and the absence of direct geochemical evidence linking the two. The concentration and stable isotope analysis of mercury provides a way to test these links as its concentration is thought to be tied to igneous activity. Mercury/total organic carbon ratios from three Permian–Triassic boundary sections with a well-resolved extinction record in South China show elevated values (up to 900 ppb/wt.% relative to a background of <100 ppb/wt.%) that exactly coincides with the end-Permian mass extinction horizon. This enrichment does not show any correlation with redox and sedimentation rate variations during that time. Hg isotope mass-independent fractionation (Δ199Hg), with sustained positive values, indicate a predominant atmospheric-derived signature of volcanic Hg in deep-shelf settings of the Daxiakou and Shangsi sections. In contrast, the nearshore environment of the Meishan section displays a negative Δ199Hg signature, interpreted to be related to terrestrial Hg sources. Such temporal differences in Δ199Hg values shed new light on Hg geochemical behavior in marine settings, and also on the kill mechanisms associated with volcanism that were responsible for biotic mortality at the end of the Permian. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109797
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), Wuhan, 430074, China; Department of Earth, Atmosphere and Environment, Monash University, Victoria, 3800, Australia; Department of Earth Sciences, University of St AndrewKY16 9AL, United Kingdom; Geological Survey of Canada, Natural Resources Canada, Calgary, Alberta T2L2A7, Canada; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, 430074, China; School of Earth and Environment, University of Leeds, Leeds, United Kingdom
Recommended Citation:
Wang X.,Cawood P.A.,Zhao H.,et al. Mercury anomalies across the end Permian mass extinction in South China from shallow and deep water depositional environments[J]. Earth and Planetary Science Letters,2018-01-01,496