摘要
湖南石门界牌峪地区雄黄矿床中伴有各类矿化角砾岩。它们互不相连、外观圆形,有的聚集成群或呈完全孤立的山包,与围岩多呈刺穿状接触。角砾岩胶结物中微量元素同该区现代热泉体系沉积物类似,成矿溶液和角砾岩胶结物包裹体成分富Na^+、Ca^(2+)、Cl^-、HCO_3^-和SO_4^(2-),也与该区现代热泉水成分相似。根据岩石学、岩石化学特征,结合微量元素、稀土元素等综合研究,认为该区矿化角砾岩是一种由热泉气体及部分物质在封闭还原条件下产生急剧爆发形成的特殊的角砾岩群,主要成因类型为“侵入状”角砾岩、爆破角砾岩、岩溶角砾岩、崩塌角砾岩。多种角砾岩的叠加现象十分明显。它们是一种极好的容矿控矿体,具有重要的找矿意义。
In the Jiepaiyu realgar ore district,Shimen County,Hunan Province,there exist a number of mineralized breccias, which occur either in groups or as isolated steep ridges or hills. They usually take elliptical or isometrical forms at surface and conical or cylindrical forms branching upward in section, and are mostly in piercing contact with country rocks. Trace elements in cements of the breccias are similar to those in sediments from modern hot springs; the components of ore-forming fluids and inclusions in breccias enriched in Na+ ,Ca2+ ,Cl- ,HCO3- and SO42- are also similar to those of modern spring waters in the area. Petrological, petrochemical and trace element and REE geochemical studies indicate that the mineralized breccias in the area were formed a result of drastic explosions of hot spring gases and related substance under the sealed and reduced conditions. There are four genetic types of mineralized breccia related to realgar deposits in the Jiepaiyu area,i. e. 'intrusive',explosive ,karst and collapse breccias. The superposition of various breccias is quite conspicuous. They are good ore-hosting and -controlling bodies and hence have important significance for ore prospecting.
出处
《地质论评》
CAS
CSCD
北大核心
1997年第5期483-489,T001,共8页
Geological Review
关键词
雄黄矿床
矿化
角砾岩
成因类型
realgar deposit,mineralized breccias, Shimen, Hunan
