西藏尼木县厅宫、白容铜矿区矿床地质的几个问题

PROBLEMS ABOUT GEOLOGY OF COPPER DEPOSITS IN TINGGONG,BAIRONG ORE DISTRICTS,NIMU COUNTY,TIBET

近期钻孔资料揭示,西藏尼木县厅宫铜矿区主要为二长花岗(斑)岩、花岗闪长斑岩、钾长花岗(斑)岩和石英闪长玢岩构成的复式斑岩体,白容铜矿区的容矿岩石为花岗闪长斑岩、闪长玢岩,以及正长斑岩、安山玢岩脉;铜(钼)矿化呈面型分布,含矿斑岩体几乎全岩矿化,与围岩接触带附近矿化强度增强;矿化垂向厚度达数百米,强弱不均,自上而下可分为氧化带、过渡带、原生带;硅化、绢云母化、高岭土化、黄铁矿化等蚀变广泛而强烈。

In Tinggong copper ore district drill holes hit mainly the monzonitic granite （porphyry）-granodioritic porphyry-K-feldspar granite （porphyry）-quartz dioritic porphyrite complex, in Bairong granodioritic porphyry, dioritic porphyrite, syenitic porphyry, andesite dykes, the host rock of Cu, Mo ore. Mineralization is in areal distribution and the ore-bearing porphyries are almost wholly mineralized. Mineralization near the country rock is enhanced. The vertical thickness of heterogeneous mineralization is several hundreds of meter. From top to bottom are the oxidized ore zone, the transitional ore zone and primary ore zone. Silicification, sericitization, kaolinitizatin pyritization etc. are strong and wide spread.