新晃贡溪-天柱大河边重晶石矿床热水沉积成因探讨

综合分析了重晶石矿床的沉积学和地球化学特征，结果表明，在扬子大陆东南边缘由于早寒武世地壳的热点活动带来了丰富的成矿物质，形成了Si-P-Ba-多金属矿床谱系。下寒武统的黑色岩系形成于缺氧环境，但重晶石形成时期还原性相对较弱。重晶石矿石中有机质碳含量较低，具有原生残留有机质的明显特征。钡的来源为热液喷气作用，生物的发育为钡的转化和富集提供了条件，海水为重晶石的形成提供了充分的硫源，但由于生物的分馏作用较强，致使重晶石δ³⁴S值可达41.65‰。

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

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 δ³⁴S are as 4.165%.