A new paleoenvironmental index for anoxic events—Mo isotopes in black shales from Upper Yangtze marine sediments

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• 作者：Lian Zhou (1)
  Jie Su (1)
  JunHua Huang (1)
  JiaXing Yan (2)
  XiNong Xie (3)
  Shan Gao (1)
  MengNing Dai (4)
  Tonger (5)
  
• 关键词：molybdenum isotopes ; proxy for paleo ; redox conditions ; black shale ; Upper Yangtze
• 刊名：Science China Earth Sciences
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：54
• 期：7
• 页码：1024-1033
• 全文大小：670KB
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• 作者单位：Lian Zhou (1)
  Jie Su (1)
  JunHua Huang (1)
  JiaXing Yan (2)
  XiNong Xie (3)
  Shan Gao (1)
  MengNing Dai (4)
  Tonger (5)
  
  1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China
  2. Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan, 430074, China
  3. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, 430074, China
  4. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an, 710069, China
  5. Wuxi Institute of Petroleum Geology, China Petroleum & Chemical Corporation, Wuxi, 214151, China
  
• ISSN：1869-1897

文摘

This paper investigates the high-solution of Mo isotopes and uses trace-element analyses for fresh and representative black shales and siliceous shales collected from the transition between the Late Ordovician and the Early Silurian at the Wangjiawan section in Yichang and the Late Permian Dalong Formation in the Shangsi Section of Sichuan. The applicability of different geochemical parameters used as paleo-oxygenation indices are also compared. The preliminary results show that V/(V+Ni), Uauth (auth U), V/Cr, Ceanom and U/Th have a scattered variation range, but most samples plot within the suboxic-anoxic fields. The suboxic-anoxic environment was dominant during the deposition and formation of the two anoxic facies. These redox indicators show little correspondence to the δ 98Mo values. The U/Mo ratio can be used as a potential proxy for the paleo-redox conditions due to the possibility that Mo is enriched relative to U at different redox gradients during early diagenesis. This evidence is more significant for the euxinicity condition and corresponds to positive δ 98Mo (>1.5- values with low U/Mo ratios. This evidence is likely related to the depositional conditions near the boundary between anoxic and euxinic environments, which are characterised by low bioturbation or water circulation. Other samples reveal a wide scatter of U/Mo ratios and δ 98Mo <1.5- These results are likely due to punctuated improvements in oxygenation with intense bioturbation or water circulation, which led to the redistribution of trace element.