云南巍山-永平矿集区碰撞成矿流体系统成矿物理化学条件分析  

THE CONDITION ANALYSIS OF METALLOGENIC PHYSICAL CHEMISTRY FOR COLLISIONAL OROGENESIS ORE FORMING FLUID SYSTEM IN WEISHAN-YONGPING MINERALIZATION DISTRICT,YUNNAN

作　　者：王勇[1] 莫宣学[2] 董方浏[1] 毕先梅[2] 喻学惠[2] 曾普胜[1] 杨伟光 

机构地区：[1]中国地质科学院矿产资源研究所 [2]中国地质大学地球科学与资源学院 [3]云南地质矿产勘查开发局

出　　处：《矿物岩石》2004年第3期72-81,共10页Mineralogy and Petrology

基　　金：中国地质调查局国土资源大调查综合研究项目(20001020026003)

摘　　要：　云南巍山-永平矿集区有铜金多金属中小型矿床及矿化点140余处,位于兰坪走滑拉分盆地南段,盆地发育和成矿作用与印度-亚洲板块碰撞密切相关。矿集区可分为紫金山背斜与公郎弧两个成矿流体系统。紫金山背斜成矿流体系统成矿流体的pH值为5.3～7.1,Eh值为-0.11V～2.84V,成矿压力为30MPa～130MPa,成矿温度为228℃～255℃,成矿深度在1.05km～6.67km。公郎弧成矿流体系统成矿流体的pH值为6.7～7.9,Eh值为-0.83V～0.11V,成矿压力为100MPa～225MPa,成矿温度为317℃～346℃,成矿深度为3.51km～7.89km。与紫金山背斜成矿流体系统相比,公郎弧成矿流体系统具有较高的成矿压力、成矿温度、成矿深度、pH值和较低的Eh值。但二者均属弱还原的中性-弱碱性成矿环境。Weishan-Yongping mineralization district is located in the Weishan-Yongping basin which is the south part of typical Lanpin strike slip fault and pull-apart basin with plenty of mineral resources resulted from the collision of India and Asia plate. It shows a good prospecting potential with more than 140 middle-small sized deposits or mineral occurrence in the Weishan-Yongping mineralization district. The ore forming fluid system can be divided into two subsystems: Zijinshan ore forming fluid subsystem and Gonglang ore forming fluid subsystem. The pH value of Zijinshan ore forming fluid subsystem is 5.3~7.1,the Eh value is -0.11 V^2.84 V, the matollogenic pressure is 30 MPa^130 MPa, the matollogenic temperature is 228℃~255℃ and the matollogenic depth is 1.05 km^6.67 km. The pH value of Gonglang ore forming fluid subsystem is 6.7~7.9,the Eh value is -0.83 V^0.11 V, the matollogenic pressure is 100 MPa^225 MPa,the matollogenic temperature is 317℃~346 ℃ and the matollogenic depth is 3.51 km^7.89 km. Comparing with Zijinshan ore forming fluid subsystem, Gonglang ore forming fluid subsystem has a higher matollogenic pressure, matollogenic temperature, matollogenic depth, pH value and a lower Eh value. But they all belong to the neutral-alkalescent matollogenic environment with weakly reduction.

关 键 词：成矿流体 成矿物理化学条件 碰撞造山 流体包裹体 

分 类 号：P611[天文地球—矿床学]