石门雄黄矿区二号窿深部找矿研究

A STUDY OF DEEP ORE PROSPECTING WORK IN NO 2 GALLERY OF THE SHIMEN REALGAR DEPOSIT

二号窿是石门雄黄矿区曾开采过的老窿。矿体主要在１６５ｍ、１４０ｍ、１２５ｍ三个标高段富集，从上至下呈现浸染状矿石—角砾状矿石的变化规律，矿石主要化学成分为Ａｓ、Ｓ、ＳｉＯ２、ＣａＯ、Ａｌ２Ｏ３、Ｆｅ２Ｏ３等；矿体元素的垂直分带明显，Ｂａ、Ｈｇ在矿体上部富集，而Ｓｂ在矿体下部含量高。窿内岩溶角砾岩、晶洞与成矿关系密切。地层、古岩溶、构造对成矿具有控制作用。地质、地球化学、地球物理特征表明二号窿深部南西方向可能存在较大的富矿体。

The Shimen deposit is a large size and high grade realgar deposit in Hunan Province.Characterized by a pipelike orebody and a typical three layer structural model,the deposit consists of silicalites, karst breccias and brecciated ores in downward succession.The realgar orebody occurs at the contact zone between Lower Ordovician Nianjingguan Formation and Fengxiang Formation.The main country rocks are composed of oolitic dolomitite,limestone, marl and claystone,and realgar is mainly concentrated at 165 m,140 m and 125 m,controlled by stratigraphic,lithological characteristics,karst and structure. Systematically described in this paper are characteristics of the realgar deposit,including its natural mode of occurrence as well as geological,geophysical and geochemical anomalies.The ore control role of the intersection between NE and EW trending faults is discussed in detail and,on such a basis,some ore prospecting targets are indicated.