北祁连山东段埃达克岩带Cu、Au成矿初探  

Cu-Au Mineralization of Adakite Belt in the Eastern Section of the North Qilian

作　　者：常华进[1] 储雪蕾[1] 王金荣[2] 冯连君[1] 黄晶[1] 

机构地区：[1]中国科学院地质与地球物理研究所 [2]兰州大学资源环境学院,甘肃兰州730000

出　　处：《西北地质》2008年第3期30-37,共8页Northwestern Geology

基　　金：国家自然科学基金项目(编号40532012,40603021,10299040);中国科学院知识创新工程项目(编号KZCX3-SW-141);甘肃自然科学基金项目(编号ZS001-A25-006-Z)资助

摘　　要：北祁连山东段存在一条埃达克岩条带,由向北俯冲的老虎山弧后盆地洋壳部分熔融形成,其形成过程具有高温、高压、富含挥发分流体、高氧逸度和快速上升的特点,有利于Cu、Au等成矿物质在埃达克岩中富集。已经在米家山、扁强沟以及屈吴山银硐梁岩体中发现了Cu、Au矿床,在西华山前寒物系中也发现了金矿床(点),表明北祁连山东段埃达克岩带具有产出与埃达克岩有关Cu、Au矿床的潜力。该埃达克岩带不仅有斑岩型和低温热液型Cu、Au矿床产出,也存在砂岩型Cu、Au矿床,可以用"四箱模型"来描述该地区矿床的形成过程及类型。不仅要注重对埃达克岩岩体的勘探,也要加强对蚀变围岩的勘探,并寻找以泥盆系为首选勘探对象的砂岩型、矿床。The adakite belt in the eastern section of the North Qilian Mountains was derived from the partial melting of the northwards subducted oceanic crust of the Laohushan back-arc basin. The melting process had the features of high temperature, high pressure, abundant fluids, abundant oxygen and rapidly ascending rate, which were beneficial for copper and gold to concentrate in adakitic magma. Many Cu-Au ore deposits found in Mijiashan, Bianqianggou, Yindongliang adakite body and Precambrian strata in Xihuashan indicate that the Cu-Au ore deposits could be formed in the adakite belt. Not only porphyry and hydrothermal alteration Cu-Au ore deposits but also sandstone-type Cu-Au ore deposits are in the belt. Four-box model can be used to describe the formation processes and types of the deposits. The adakite body and the wall rock should be the main prospecting targets. Meanwhile, the Devonian sedimentary should be prospected firstly for sandstone-type Cu-Au ore deposits.

关 键 词：埃达克岩 成矿 米家山 屈吴山 西华山 北祁连山 

分 类 号：P618.41[天文地球—矿床学] P618.51[天文地球—地质学]