北祁连西段寒山剪切带的变形作用及其与金矿化的关系  

DEFORMATION OF THE HANSHAN SHEAR ZONE AND ITS RELATIONSHIP TO GOLD MINERALIZATION IN WEST PART OF NORTH QILIANSHAN

作　　者：吴茂炳 毛景文[2] 杨建民[2] 张招崇[3] 左国朝 

机构地区：[1]甘肃省地质矿产局地质科学研究所,兰州730000 [2]中国地质科学院矿床地质研究所,北京100037 [3]中国地质科学院地质研究所,北京100037

出　　处：《地质与勘探》1999年第4期12-14,共3页Geology and Exploration

基　　金：国家计委科技找矿项目

摘　　要：　　寒山金矿床赋存的剪切带有两期变形活动。早期韧脆性变形作用是以位错滑移、双晶作用和重结晶作用等变形机制为主，形成各种类型的片糜岩。在变形过程中，大量流体进行水／ 岩反应。晚期变形作用以碎裂和破裂机制为主，形成各种脆性裂隙和角砾岩带。在早期开放的变形环境下，有利于成矿热液的活动和富集，是寒山金矿的主成矿期；The shear zone hosting the Hanshan gold deposit indicates two periods of deformation Early ductile deformation is characterized by dislocation glide,twinning displacement and recrystallization,forming schist and mylonite A great amount of fluid took part in water/rock reaction during deformation Late period of deformation is characterized by cataclasis and breakage forming varied sorts of brittle fractures and breccia zones The early deformational environment was favourable for movement of ore forming hydrothermal solution and precipitation of gold and other metals The late brittle deformation caused gold to be enrichment again

关 键 词：韧脆性剪切带 变形作用 金矿床 矿化 

分 类 号：P618.510.5[天文地球—矿床学] P542.2[天文地球—地质学]