西藏改则县色那铜金矿床地质特征及成因  

Geological features and genesis of the Sena copper-gold deposit in the GêrzêCounty,Tibet

作　　者：吴丰 孙振明 王思成 杨煊 杨枢卿 吕星池 WU Feng;SUN Zhenming;WANG Sicheng;YANG Xuan;YANG Shuqing;LV Xingchi(School of Prospecting and Surverying Engineering,Changchun Institute of Technology,Changchun 130021,Jilin,China)

机构地区：[1]长春工程学院勘查与测绘工程学院,吉林长春130021

出　　处：《吉林地质》2022年第4期7-13,共7页Jilin Geology

基　　金：吉林省大学生创新创业训练项目(S202211437107)资助。

摘　　要：色那铜金矿床是多龙矿集区重要组成矿床之一。本文在系统分析其矿床地质特征、矿体特征、矿石特征及围岩蚀变等特征,通过野外调研及室内岩相学与矿相学分析,将色那铜金矿的形成划分为石英-多金属硫化物阶段、碳酸盐-黄铁矿阶段和表生成矿阶段三个成矿阶段。同时分析了色那铜金矿床的围岩蚀变特征,认为色那铜金矿床不具备典型斑岩型矿床的以岩体为中心的中心式面型蚀变特征,通过与区内典型斑岩型铜金矿床和斑岩-高硫化浅成低温热液型矿床地质特征进行对比,推测色那铜金矿床的矿床成因类型为斑岩-高硫化浅成低温热液型矿床。根据矿体产出地质条件,认为具有绢云母化和青磐岩化的早白垩世花岗闪长斑岩与色哇组长石石英砂岩是重要找矿标志。The Sena copper-gold deposit is one of the important constituent deposits of the Duolong ore-concentration area.In this paper,we investigate the geological features,ore body characteristics,ore characteristics and alteration of the surrounding rocks,etc.Through field research and indoor petrographic and ore-phase analyses,we classify the formation of Sena copper-gold deposit into three mineralization stages:quartz-polymetallic sulfide stage,calcite-pyrite stage and oxidation stage.At the same time,the alteration characteristics of the surrounding rocks of the Sena copper-gold deposit were analyzed,and it is considered that the Sena copper-gold deposit does not have the Rock-centered central face alteration characteristics of typical porphyry deposits.By comparing with the geological characteristics of typical porphyry copper-gold deposit and porphyry-high sulfide epithermal deposit in the area,the characteristics of the Sena copper-gold deposit is porphyry-high sulfide epithermal deposit.According to the geological conditions of ore body,the early Cretaceous quartz diorite porphyrite with sericite and lapianization and Sewachenite quartz sandstone are important prospecting indicators.

关 键 词：西藏 改则县 色那铜金矿 地质特征 矿床成因 

分 类 号：P618.41[天文地球—矿床学] P618.51[天文地球—地质学]