中冈底斯布东拉金矿床地质特征、控矿因素和找矿标志

布东拉金矿床是近年来在中冈底斯岩浆岩带新发现的少有的中型岩金矿床。矿床位于措勤弧后盆地的北西向和北东向断裂的交汇部位,矿体严格受断裂构造的控制,产于北西向次级断裂带中,呈脉状、透镜体状产出;矿体由石英脉和构造蚀变岩组成,主要矿石矿物为黄铁矿、黄铜矿、方铅矿、闪锌矿,以及自然金等;矿床围岩蚀变强烈,以黄铁绢英岩化为主;岩浆岩和构造是该矿床的主要控制因素;北西向构造、围岩蚀变、含硫化物石英脉、地球化学异常等可作为找矿标志。该矿床的发现丰富了冈底斯金矿床的矿床类型,对金成矿规律的总结具有重要意义。

THE GEOLOGICAL FEATURES,PROSPECTING FACTORS AND SYMBOLS OF BOUDON'S GOLDERN DEPOSIT,MIDDLE GANGDESE

Be founded at the magmatic belt of middle Gangdese, the medium Boudongla goldern deposit is located at the jointing part between northwestern rupture and northeastern rupture of back-arc basin. The vein and lens orebody are developed in NW sublevel fractured zone, and be controlled by fractured structure. They are composed of quartzite veins and altered rock with the principal minerals of pyrite, chalcopyrite, galena, sphalerite and native gold. The wallrock alter strongly by pyritized phyllite.We will prospect in the area according to the magmatic rock and structure as well as the NW structure, wallrock alteration, sulfid-bearing quartz vein and geochemical anomaly. It is better to find Boudon's deposit for conclude the gold formation regulation.