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Anomalous mercury enrichment in Early Cambrian black shales of South China: Mercury isotopes indicate a seawater source
Runsheng Yin; Lingang Xu; Bernd Lehmann; Ryan F.Lepak; James P.Hurley; Jingwen Mao; Xinbin Feng; Ruizhong Hu
2017
发表期刊Chemical Geology
卷号467页码:159-167
摘要

Extremely elevated Hg levels up to the mu g g(-1) range were found in sulfide-rich black shale and phosphorite in the lowermost part of the Early Cambrian black shale sequences on the Yangtze Platform in South China. In this study, mercury isotopes were used to help resolve the origin of this anomalous Hg enrichment. Mass independent fractionation signatures of Hg isotopes with positive Delta Hg-199 values of 0.13 to 0.24% and positive Delta Hg-200 values of 0.05 to 0.10% were observed, indicating seawater is an important source of Hg. We hypothesize that up-welling of nutrient-rich waters from the open ocean resulted in high bioproductivity in the photic zone with concomitant scavenging of Hg from seawater. Advanced decay of biomass and remineralization under anoxic to euxinic conditions combined with very low clastic input led to enrichment of Hg and a broad spectrum of other redox-sensitive and biogenic metals up to 107 compared to modern seawater. Such spectacular hydrogenous metal enrichment has previously been observed in the oxic deep-sea environment only, i.e. manganese crusts/nodules.

关键词Early Cambrian Sulfide-rich Black Shale Seawater Hg Isotopes
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8062
专题矿床地球化学国家重点实验室
环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.Environmental Chemistry and Technology Program, University of Wisconsin-Madison, Madison, WI, 53706, USA
3.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
4.Mineral Resources, Technical University of Clausthal, 38678 Clausthal-Zellerfeld, Germany
5.MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
6.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
推荐引用方式
GB/T 7714
Runsheng Yin,Lingang Xu,Bernd Lehmann,et al. Anomalous mercury enrichment in Early Cambrian black shales of South China: Mercury isotopes indicate a seawater source[J]. Chemical Geology,2017,467:159-167.
APA Runsheng Yin.,Lingang Xu.,Bernd Lehmann.,Ryan F.Lepak.,James P.Hurley.,...&Ruizhong Hu.(2017).Anomalous mercury enrichment in Early Cambrian black shales of South China: Mercury isotopes indicate a seawater source.Chemical Geology,467,159-167.
MLA Runsheng Yin,et al."Anomalous mercury enrichment in Early Cambrian black shales of South China: Mercury isotopes indicate a seawater source".Chemical Geology 467(2017):159-167.
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