阿尔金北缘大平沟金矿床成因初探  

A DISCUSSION ON THE GENESIS OF DAPINGGOU GOLD DEPOSIT OF XINJIANG,NORTHWEST CHINA

作　　者：杨风 陈柏林[2] 陈宣华[2] 王小凤[2] 王克卓 陈正乐[2] 李学智 杨屹 

机构地区：[1]新疆地质调查院第一地质调查所,新疆乌鲁木齐830011 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《地质与资源》2001年第3期133-138,共6页Geology and Resources

基　　金：国家 30 5项目 (96 - 91 5 - 0 6 - 0 1 );新一轮国土资源大调查项目 (K1 1 2 3)联合资助

摘　　要：大平沟金矿床是阿尔金北缘地区近年来新发现的为数有限的金矿床之一 ,受韧性剪切带构造控制 ,矿化类型主要为蚀变糜棱岩型及少量钾长石石英脉型 .稀土元素、流体、包裹体特征和稳定同位素研究显示成矿物质主要来源于变质岩 ,成矿温度 198～ 2 90℃ ,成矿流体密度为 0 791～ 0 971g/cm3 ,盐度 2 36 %～ 5 5 %,成矿压力 42～70MPa ,成矿深度为 1 6 1～ 2 6 8km .成矿流体主要来源于变质岩 ,有少量岩浆水和大气降水的混入 ,金矿化年龄2 0 0Ma ,属于印支期中温动力变质热液型金矿床 .Dapinggou gold deposit,as one of the several recently found in north area of Altyn Mountain,is controlled by ductile shear zone.It is characterized by mainly altered mylonite-type with partly quartz vein-type.Information from REE characteristics shows that the source materials of the deposit are derived mainly from the metamorphic rocks.While inclusion study indicates that the ore fluid comes from dynamic metamorphic water source with a little influence of magmatic and meteoric water.The ore fluid is featured by density of 0.791～0.971 g/cm 3 and salinity of 2.36%～5.5%.The gold deposit forms at 1.61～2.68 km below the surface with a temperature of 198～290℃ and pressure of 42～70 MPa.The gold mineralization age is about 200 Ma.So Dapinggou gold deposit is a medium-temperature dynamic metamorphic hydrothermal type formed in Indo-Chinese epoch.

关 键 词：中温动力变质热液型 大平沟金矿床 成因 印支期 阿尔金北缘地区 

分 类 号：P618.51[天文地球—矿床学]