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The Hydrothermal Sedimentary Genesis of Barite Deposits in West Hunan and East Guizhou

WU Chaodong\ YANG Chengyun (Department of Geology,Peking University,Beijing,100871) CHEN\ Qiying (Institute of Geology,Chinese Academy of Sciences,Beijing,100029)  
The super hydrothermal barite deposits occur in west Hunan and east Guizhou.The paper mainly deal with the characteristics of the sedimentary and geochemistry of barite.The results show that the abundant resources are from the hot spots of the crust of the continental margin in early Cambrian,and deposited the Si\|P\|Ba\|PGE series.The Cambrian black shales sediment in anoxia environment,but the degree of reducing was low.The content of organic matter in barite is small,but it is primary.Ba was from the hydrothermal gas and liquid,and the organisms transverse and enrich Ba,and S was from the seawater fractionated by the organisms,the δ 34 S are as 41 65‰.
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