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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Mercury anomalies across the end Permian mass extinction in South China from shallow and deep water depositional environments
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Mercury anomalies across the end Permian mass extinction in South China from shallow and deep water depositional environments

机译：跨越浅水沉积环境的南方末末端的汞异常

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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 (Delta Hg-199), 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 Delta Hg-199 signature, interpreted to be related to terrestrial Hg sources. Such temporal differences in Delta Hg-199 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. (C) 2018 Elsevier B.V. All rights reserved.
机译：地球上的生命遭受其最大的生物危机，因为多细胞生物二叠纪末大灭绝过程中需要600万年前上涨。在西伯利亚溢流玄武岩喷发的大规模灭绝的巧合是公认的，但在中国南方爆发和灭亡的过程之间的确切因果关系是其广泛的空间分离，没有直接证据地球化学连接两个不确定性所致。汞的浓度和稳定同位素分析提供了一种方法作为它的浓度被认为是依赖于火山活动，以测试这些链接。汞/从三个三叠纪边界部总有机碳的比率与中国南方良好分辨的消光记录显示出升高的值（最大为PPB /相对％900重量至℃的背景; 100ppb的/重量％），其确切与二叠纪末生物大灭绝地平线一致。这种富集不显示在这段时间内与氧化还原和沉积速率变化的任何关联。汞同位素质谱独立分馏（三角洲汞-199），与持续的正值，表明在Daxiakou和上思段的深货架设置火山汞的主要大气来源的签名。与此相反，梅山部分显示一个负德尔塔汞199签名的近岸环境，解释为与地面汞源。在三角洲汞199值这样的时间差在海洋设置新的视角对汞地球化学行为，也与火山活动是负责在二叠纪末生物死亡率杀机制。 （c）2018年elestvier b.v.保留所有权利。

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