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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
Source PublicationChemical Geology
Volume467Pages:159-167
Abstract

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.

KeywordEarly Cambrian Sulfide-rich Black Shale Seawater Hg Isotopes
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8062
Collection矿床地球化学国家重点实验室
Affiliation1.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
Recommended Citation
GB/T 7714
Runsheng Yin;Lingang Xu;Bernd Lehmann;Ryan F.Lepak;James P.Hurley;Jingwen Mao;Xinbin Feng;Ruizhong Hu. 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;Jingwen Mao;Xinbin Feng;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;Lingang Xu;Bernd Lehmann;Ryan F.Lepak;James P.Hurley;Jingwen Mao;Xinbin Feng;Ruizhong Hu."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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