银硐子-大西沟特大型银多金属矿床中重晶石岩类特征及成岩成矿作用

Characteristics of bariteolites and diagenism metallogenesis for super large, silver polytmetallic deposits in Yingdongzi and Daxigou, Shaanxi

本文通过对银硐子特大型银多金属矿床中重晶石岩类的岩石学、矿物学、地球化学等特征研究和总结， 认为本区重晶石岩类是由热水流体同生沉积作用形成的。热水成岩成矿作用方式有两种， 重晶石单矿物岩成分纯度高， Ｂａ Ｓ Ｏ４ 的含量为 ７７２９％ ～９９３７％ ， 其他成分混入少， 以热水快速化学沉淀的方式同生沉积形成； 重晶石岩类及银多金属矿石中， Ｂａ Ｏ（５６９％ ～２９０６％ ）、 Ｓｉ Ｏ２、 Ａｌ２ Ｏ３、 Ｆｅ２ Ｏ３ 、 Ｆｅ Ｏ、 Ｎａ２ Ｏ、 Ｓ、 Ｃｕ、 Ｐｂ、 Ｚｎ、 Ａｇ 等含量高， 是不同成分、性状热水混合触发的层流体系失稳造成矿质大量骤沉， 热水混合同生沉积作用形成了重晶石岩类及银多金属矿层。

Based on the studies of petrology, mineralogy and geochemistry of bariteolites, the characteristics of bariteolites from superlarge, silver polymetallic deposits in Yingdongzi and Daxigou , Shaanxi, have been discussed in this paper, and diagenism metallogenesis of the bariteolites have also been discussed in the paper Rapid chemical depositions of hot fluid in the microthermal basin on the sea bed and abrupt depositions casued by the mixing of different components of the hydrothermal fluid in the subbasin on the sea bed were dominant during diagenism and metallogenesis in the Denovian hot water basin Results of the studies have shown that it is significant to do survey for gold deposit in the areas where the bariteolites occur