西藏山南铜多金属成矿系统及走滑转换构造应力场分析  

Copper Polymetallic Ore-Forming System in Shannan Area and Analysis of Tectonic Stress Field in the Strike-Slip Transfer Zone in Tibet

作　　者：黄树峰[1,2] 江善元[2] 江化寨 陈玉水[2] 

机构地区：[1]中国冶金地质总局矿产资源研究院,北京100025 [2]中国冶金地质总局第二地质勘查院,福建莆田351111

出　　处：《地质与勘探》2011年第1期1-10,共10页Geology and Exploration

基　　金：<西藏山南地区泽当矿田铜多金属矿普查>及<西藏冈底斯东段铜多金属资源评价与新方法技术研究>项目成果

摘　　要：系统找矿思路和模式找矿方法是新时期寻找隐伏-半隐伏矿床、实现地质找矿重大突破的根本有效途径。本文以西藏山南地区泽当矿田主要铜多金属矿床地质解剖研究为基础,初步提出并总结了西藏山南地区泽当铜多金属矿田内走滑型陆缘构造成矿系统的矿床系列、构造系列和组成模式、成因(演化)模式、找矿模式,初步分析了控制西藏山南铜多金属成矿系统的走滑断裂构造应力场的转换过程:早期层矽卡岩型铜多金属矿床构造三向主应力状态-σ1:308°∠45°,σ2:47°∠8°,σ3:146°∠52°(努日);晚期斑岩型矿床(化)构造三向主应力状态-σ1:360°∠8°,σ2:128°∠75°,σ3:268°∠10°(努日);σ1:230°∠8°,σ2:322°∠2°,σ3:66°∠80°(明则)。分析表明:控矿构造具有外动力逆时针旋转以及雅鲁藏布江会聚型左旋走滑断裂为主导的转换构造应力场特征。The systematical prospecting theory and pattern prospecting method are the fundamental and effective approaches in search for concealed-half concealed mineral deposits in new era,so as for achieving significant breakthroughs in geological surveys.Based on the geological anatomizing study of the major Cu multiple-metal deposits of the Zetang orefield in the Shannan area,Tibet,this paper suggests and summarizes the series of deposits and structures,the pattern of composition,cause（evolution）and prospection of the strike-slip type continental margin structural ore-forming system in the Zetang Cu multiple-metal deposits of the Shanna area,Tibet.It also makes a preliminary analysis on the transfer process of strike-slip rift tectonic stress field which controls the Shannan Cu multiple-metal ore-forming system.It can be described by a three-dimensional principal stress state of early-layer skarn Cu multiple-metal deposit structure-σ1 308°∠45°,σ2 47°∠ 8°,and σ3 146°∠ 52°（Nuri）;three-dimensional principal stress state of late porphyry deposit or mineralization-σ1 360°∠8°,σ2 128°∠75°,and σ3 268°∠10°（Nuri）;σ1 230°∠8°,σ2 322°∠2°,and σ3 66°∠80°（Mingze）.The analysis indicates that the ore-control structure is characterized by a transfer tectonic stress field dominated by outside dynamic anti-clockwise rotation and left-slip strike faults in the Yaluzangbu convergence zone.

关 键 词：西藏山南 铜多金属矿 成矿系统 构造应力场 转换过程 

分 类 号：P618.41[天文地球—矿床学] P542[天文地球—地质学]