内蒙古额济纳旗少斜沟钨铜钼矿成矿特征

额济纳旗少斜沟钨铜钼矿赋存于石炭纪-二叠纪花岗岩类岩体与下石炭统绿条山组的接触带附近及岩体内. 矿化蚀变分带总体呈环状, 最外带为碳酸盐化、绿帘石化、绿泥石化; 次外带为夕卡岩化、角岩化、白钨矿化; 中带为硅化、云英岩化、辉钼矿化; 内带为硅化、孔雀石化、黄铜矿化. 由外向内成矿元素从高温到低温富集, 形成钨矿→钼矿→铜矿. 另外, 结合矿体特征、含矿岩体的矿石地球化学特征和锆石U-Pb测年资料等讨论了矿床的成因类型和成矿时代, 认为该矿床成因类型为斑岩型, 成矿时间为305.1±1.9 Ma, 为晚石炭世.

METALLOGENIC CHARACTERISTICS OF SHAOXIEGOU TUNGSTEN-COPPER-MOLYBDENUM DEPOSIT IN EJINA QI,INNER MONGOLIA

The Shaoxiegou tungsten-copper-molybdenum deposit in Ejina Qi is occurred in the contact zone between the Carboniferous-Permian granitoid body and Lower Carboniferous Lyutiaoshan Formation, and in the nearby rock mass as well. The mineralized alteration zonation is generally annular, with the outermost zone of carbonatization, epidotization and chloritization, the secondary outer zone of skarnization, hornfelsization and scheelite mineralization, the middle zone of silicification, greisenization and molybdenite mineralization, and the inner zone of silicification, malachitization and chalcopyrite mineralization. From outside to inside, metallogenic elements are enriched from high temperature to low, forming tungsten deposit → molybdenum deposit → copper deposit. The paper also discusses the genetic type and metallogenic age of the deposit combined with the orebody characteristics, geochemical characteristics of ore-bearing rock mass and zircon U-Pb dating data. It is considered that the deposit is genetically of porphyry type, with the metallogenic time of 305.1±1.9 Ma, which was formed in Late Carboniferous.