西藏昌都地区水系沉积物异常特征与成矿地质条件分析  

Characteristics of river sediment anomaly in Changdu area,Tibet and analysis of metallogenic geological condition of the area

作　　者：王纪昆 张晓鹏 王建青[1] 刘建 冀建军[1] WANG Jikun;ZHANG Xiaopeng;WANG Jinqing;LIU Jian;JI jianjun(Tian jin North China Geological Exploration General Institute,Tianjin 300170,China)

机构地区：[1]天津华北地质勘查总院,天津300170

出　　处：《地质找矿论丛》2023年第4期495-502,共8页Contributions to Geology and Mineral Resources Research

基　　金：中国地质调查局项目“西藏昌都地区1∶5万昂地幅(H47E004005);郎达幅(H47E005005)区域地质调查”(编号:DD2016001602)资助。

摘　　要：西藏昌都地区位于北羌塘-昌都成矿带北段,大地构造位处澜沧江构造带与金沙江结合带之间。区内上三叠统、侏罗系变质程度较浅,褶皱构造发育,煌斑岩脉等脉岩发育。本文分析了区域成矿背景和水系沉积物异常特征,认为该区煌斑岩脉体与玉龙铜矿含矿斑岩体具有相似的动力学背景;区内水系沉积物异常以Sn、W、Pb、Zn、Ag异常为主,伴生Au、Hg、Sb等要素异常,其中日通异常发育有高、中、低温元素分带,且Bi、Sb、Pb、Ag异常规模大、均值及极值高,衬值也高,此异常内已发现铜钼矿化、铜铅锌矿点,应属于矿致异常,建议对日通异常开展进一步的检查评价工作。Changdu area of Tibet is located in the northern section of North Qiangtang-Changdu metallogenic belt,and tectonically located between Lancang River structural belt and Jinsha River junction belt.In the area Upper Triassic and Jurassic strata are shallowly metamorphosed,folds and lamprophyre dikes are developed.Analysis of the regional metallogenic background and characteristics of river sediment anomaly shows that dynamic background of lamprophyre dike in Changdu area is similar to that of ore-bearing porphyry in Yulong Cu deposit.River sediment anomaly in the area is dominated by Sn、W、Pb、Zn、Ag and accompanied by Au、Hg、Sb etc.At anomaly Ritong low temperature element and high temperature element are separatly zoned and Bi、Sb、Pb、Ag anomaly is in large size with high values of average,maximum and contrast and possibly ore-caused Cu-Mo mineralization and ore occurrences have been located thus the anomaly should be furtherly checked and assessed.

关 键 词：水系沉积物 煌斑岩脉 成矿地质条件 昌都地区 西藏 

分 类 号：P595[天文地球—地球化学] P618.4[天文地球—地质学]