| Re-Os isotopes and PGE geochemistry of black shales and intercalated Ni-Mo polymetallic sulfide bed from the Lower Cambrian Niutitang Formation, South China |
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| 引用本文： | JIANG Shaoyong*,YANG Jinghong,LING Hongfei,FENG Hongzhen,CHEN Yongquan and CHEN Jianhua(State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China). Re-Os isotopes and PGE geochemistry of black shales and intercalated Ni-Mo polymetallic sulfide bed from the Lower Cambrian Niutitang Formation, South China[J]. 自然科学进展(英文版), 2003, 13(10). DOI: 10.1080/10020070312331344440 |
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| 作者姓名： | JIANG Shaoyong* YANG Jinghong LING Hongfei FENG Hongzhen CHEN Yongquan and CHEN Jianhua(State Key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing 210093 China) |
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| 作者单位： | State Key Laboratory for Mineral Deposits Research，Department of Earth Sciences，Nanjing University，Nanjing 210093，China |
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| 基金项目： | SupportedbytheNationalNaturalScienceFoundationofChina (GrantNos.40 2 2 13 0 1，40 172 0 41and 40 2 3 2 0 2 0 ) |
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| 摘 要： | The paleo oceanenvironmentalchangeduringthePrecambrian Cambriantransitionisakeyissuere latedtothecausesforanexplosiveradiationofdiffer entmetazoanphyladuringtheEarlyCambrianera .Thechemicalandisotopiccompositionsofmarinesed iments (carbonates ,phosphorites ,siliceousrocks ,andblackshales)recordthechangingcompositionandphysicalconditionsoftheseawaterinwhichtheserocksaccumulated .Organiccarbon richblackshalesfrommarineenvironmentsarecommonlyenrichedinanumberoftraceelementssuchasNi,Mo ,V ,Co ,…
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Re-Os isotopes and PGE geochemistry of black shales and intercalated Ni-Mo polymetallic sulfide bed from the Lower Cambrian Niutitang Formation, South China |
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| JIANG Shaoyong,YANG Jinghong,LING Hongfei,FENG Hongzhen,CHEN Yongquan,CHEN Jianhua. Re-Os isotopes and PGE geochemistry of black shales and intercalated Ni-Mo polymetallic sulfide bed from the Lower Cambrian Niutitang Formation, South China[J]. Progress in Natural Science, 2003, 13(10). DOI: 10.1080/10020070312331344440 |
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| Authors: | JIANG Shaoyong YANG Jinghong LING Hongfei FENG Hongzhen CHEN Yongquan CHEN Jianhua |
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| Abstract: | The Lower Cambrian Niutitang Formation consists of a thick black shale sequence with a regionally distributed conformable Ni-Mo polymetallic sulfide horizon and a chert bed at its basal strata on theYangtze Platform, South China. In this paper, we discuss all available data on Re-Os isotopes and Platinum Group Element (PGE) distribution pattern of the Ni-Mo polymetallic sulfide ore and its host rocks (black shales, cherts, and phosphorites) from Guizhou and Hunan provinces. Our results show that the black shales and the Ni-Mo sulfide ore have a high initial 187Os/188Os ratio of 0.78～0.86, indicating that the Early Cambrian ocean across the Yangtze Platform had a highly radiogenic Os value. This ratio is slightly lower than but still similar to present-day seawater, possibly as a result of high continental weathering at that time. The Ni-Mo sulfide ore yields a Re-Os isochron of 537±10 Ma (MSWD=11.9), possibly representing the depositional age of the Niutitang Formation. The chondrite-normalized PGE pattern, Pt anomaly (Pt/Pt*), Pt/Pd, Ir/Pd, Au/Ir and Re/Mo ratios of the Ni-Mo sulfide ore and its host rocks from South China indicate a varying source contribution of the PGE and other metals for different rocks. It is suggested that the cherts and Ni-Mo sulfide ore may have a significant proportion of PGE and probably other metals deriving from submarine-hydrothermal fluids with a mantle signature. |
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| Keywords: | Re Os isotopes PGE black shale Ni Mo sulfide Yangtze Platform South China. |
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