西藏岗讲铜矿蚀变及斑岩稀土、微量元素特征

Wall-rock Alteration and REE and Minor Element Geochemistry for the Gangjiang Porphyry Cu Deposit in Tibet

岗讲铜矿地处西藏尼木县,经过系统钻孔施工表明矿床规模大,主要有用组分为Cu、Mo。矿床类型为斑岩型,矿区蚀变广泛,蚀变矿物种类多,与成矿有关的蚀变主要有钾硅化、黄铁矿化。按氧化蚀变可分为Ⅲ带又Ⅴ个亚带。根据经稀土、微量元素分析,初步判断含矿斑岩来源下地壳,含矿斑状二长花岗岩含有F等挥发组分。

The Gangjiang porphyry Cu deposit is located at Nyemo, Tibet. Ore-bearing porphyry is F-rich porphyritic monzogranite. Wall-rock alteration may be divided into 3 zones and 5 subzones. Cu mineralization is related to alterations such as potash feldspathization, silicification and pyritization. The REE and minor element geochemistry indicates that ore material was derived from mantle.