青海省都兰县瓦勒尕金矿成因及成矿机制分析

Analysis of The Genesis and Mineralization Mechanism of TheWalega Gold Deposit in DulanCounty,QinghaiProvince

研究区位于青海省都兰县沟里乡,地处东昆仑造山带东段,研究区内山系总体呈北西走向,南陡北缓,属高山中切割区。研究区内岩浆活动频繁,地质构造复杂,区内构造以断裂构造为主且具多期多阶段活动特点,未见明显的褶皱构造形迹。根据断裂构展布形态可将其分为东西向和近东西向、北北东向、北西向四组。金矿体的控矿构造主要为北北东向断裂,矿体产于北北东向断裂内的构造蚀变带中,蚀变带围岩为蚀变花岗岩、花岗闪长岩,组成矿体的岩石多呈碎块、粉末状。

This study area is locatedin the eastern section of the east Kunlun orogenic beltin Goulicountry,Dulancounty,Qinghai province.The magmatic activity in the study area is frequent,the geological structure is complex and the fault structure is main and not developed.According to the distribution direction in study area,there are four fault structures:E-W,nearE-W,N-E and NW.The ore-controlling structure of gold orebody is mainly the NNE and NW tectonic alteration zone,and the orebody occurs in the tectonic alteration zone.The surrounding rock of the alteration zone is altered granite and granodiorite,and most of the rocks that make up the orebody are fragmented and powdery.