| Trace element geochemistry of the Lower Cambrian black rock series from northwestern Hunan, South China |
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| 作者姓名： | PAN Jiayong MA Dongsheng CAO Shuanglin |
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| 作者单位： | The State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China;East China Institute of Technology, Fuzhou 344000, China,The State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China,The State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China;East China Institute of Technology, Fuzhou 344000, China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，南京大学校科研和教改项目 |
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| 摘 要： | Samples of black rock series collected from the Lower Cambrian Niutitang Formation, northwestern Hunan Province, China, were analyzed for trace elements.The trace element geochemical characteristics of the ore layer (high enrichments of Ni, Mo, V, U, Cu, Pb, Zn, Cd, Tl and Ba; high U/Th ratios and LREE-enriched patterns with positive Eu and Y anomalies) support the assumption that the Ni-Mo polymetallic layer is of submarine hydrothermal origin.High field strength elements (HFSE) and lithophile elements such as Nb, Ta, Zr, Hf, Li, Be, Rb, Cs, Th and Sc are remarkably higher in the upper unit than those in the lower unit of the Niutitang Formation.These features may reflect that hydrothermal contributions were diminished, and terrigenous constituents were increased in the sediments of the upper unit of the Niutitang Formation.
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| 关 键 词： | black rock series Early Cambrian trace elements northwestern Hunan China |
Trace element geochemistry of the Lower Cambrian black rock series from northwestern Hunan, South China |
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| PAN Jiayong,MA Dongsheng,CAO Shuanglin.Trace element geochemistry of the Lower Cambrian black rock series from northwestern Hunan, South China[J].Progress in Natural Science,2004,14(1):64-70. |
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| Authors: | PAN Jiayong MA Dongsheng CAO Shuanglin |
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| Institution: | 1. The State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China;East China Institute of Technology, Fuzhou 344000, China
2. The State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China |
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| Abstract: | Samples of black rock series collected from the Lower Cambrian Niutitang Formation, northwestern Hunan Province, China, were analyzed for trace elements.The trace element geochemical characteristics of the ore layer (high enrichments of Ni, Mo, V, U, Cu, Pb, Zn, Cd, Tl and Ba; high U/Th ratios and LREE-enriched patterns with positive Eu and Y anomalies) support the assumption that the Ni-Mo polymetallic layer is of submarine hydrothermal origin.High field strength elements (HFSE) and lithophile elements such as Nb, Ta, Zr, Hf, Li, Be, Rb, Cs, Th and Sc are remarkably higher in the upper unit than those in the lower unit of the Niutitang Formation.These features may reflect that hydrothermal contributions were diminished, and terrigenous constituents were increased in the sediments of the upper unit of the Niutitang Formation. |
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| Keywords: | black rock series Early Cambrian trace elements northwestern Hunan China |
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