西藏班戈县长给铅多金属矿床地质特征及找矿远景

Geologic features and prospecting perspective of Changji Lead multi-metal deposit in Bange County, Tibet

长给铅多金属矿位于查江—罗布琼宗古生代断隆的北东侧边缘断裂带上,北西、近南北、近东西向构造的交汇部位。出露地层主要为石炭系永珠组石英砂岩及长石石英砂岩,推测深部可能有隐伏的晚白垩世花岗岩。本矿床发育2条矿体,赋存在北西向矿化蚀变带中。蚀变以褐铁矿化、硅化、绿帘石化为主。矿化主要为黄铁矿化、方铅矿化、孔雀石化。结合地质、物探、化探及遥感特征,表明长给铅多金属矿属于热液型矿床,矿化蚀变较强,规模大,物化探异常套合较好,有良好的找矿前景。

Changji lead multi-metal deposit is located in the intersections of NW, nearly NS, nearly EW structure, which is in the fault zone of the edge of northeast of the Chajiang-Luobuqiongzong fault-rise of the Paleozoic. There are mainly exposed quartz sandstone and feldspar quartz sandstone of the Carboniferous Yunzhu Formation, and maybe granites of Late Cretaceous. This deposit develops two ore bodies, which hostes in NW mineralized and alteration zone. There are some alteration of limonitization, silicification, epidotization. The main mineralization is pyritization, galena mineralization, malachitization. From the feature of geology, geophysical and geochemical exploration, remote sensing, Changji lead multi-metal deposit belongs to hydrothermal deposit of strong mineralization and alteration, large-scale, geophysical and geochemical anomalies fitting well, and has good prospecting perspective.