内蒙古毛登钼锡铜矿床地质特征及成因探讨

Geological characteristics and deposit genesis of Maodeng molybdenum-tin-copper deposit,Inner Mongolia

内蒙古毛登钼锡铜矿床为近年来勘查发现的大型钼多金属矿。钼矿床规模大,矿体埋藏深度中等,矿体形态为层状、似层状及厚大透镜状,矿体分布主要受花岗岩体外接触带角砾岩控制,矿床类型属角砾岩型高—中温热液钼矿床。锡铜矿体位于中浅部,属陡倾斜平行密集脉状矿,矿体形态一般呈板状体,矿体分布主要受花岗斑岩外接触带西侧角砾岩及变质粉砂岩中的北西向断裂构造所控制,矿床类型属构造蚀变岩型高—中温热液脉状锡铜矿床。文章着重从成矿地质条件、矿体地质特征和控矿因素等方面阐述该矿床的地质特征及矿床成因。

The Maodeng molybdenum-tin-copper deposit located in the Inner Mongolia, is a large molybdenum polymetallic deposit explored in recent years. The molybdenum deposit has the large size in tonnage, the molybdenum ore bodies are in forms of bedded, stratiform - like and thick lenticular shapes and occur in the middle level below the surface. The ore body is mainly controlled by breccias in the external contact zone of granite intrusive, and the deposit genesis is the high - mesothermal hydrothermal breccia type deposit. The tin - copper ore bodies consist of a series of parallel and dense veins which incline steeply and occur in the middle - shal- low level. The tin - copper orebody is generally tabular, and mainly controlled by the breccias on the western side of the outer contact zone of granite porphyry and the NW - trending fracture structures within the metamorphic sihstone, and the deposit type belongs to the structure - altered type and high - mesothermal hydrothermal vein type tin - copper deposit. In this paper, the geological characteristics and genesis of the Maodeng molybdenum-tin-copper deposit are discussed based on the metallogenie conditions, geological charac-teristics of the orebody and the ore - controlling factors.