北祁连加里东造山带南缘钨矿成矿背景及找矿潜力  

SKARN-QUARTZ VEIN TYPE TUNGSTEN METALLOGENIC SETTING AND PROSPECTING POTENTIAL IN THE SOUTHERN MARGIN OF NORTH QILIAN CALEDONIAN OROGEN NORTHWEST CHINA

作　　者：林国芳 刘凤萍 

机构地区：[1]甘肃省有色地质勘查局106队,甘肃兰州730047

出　　处：《甘肃地质学报》2003年第1期78-84,共7页Acta Geologica Gansu

基　　金：中国地质调查局资源调查评价项目 (1 2 1 2 0 1 0 330 6 0 1 )资助

摘　　要：北祁连加里东造山带主要钨矿类型为夕卡岩—石英脉型 ,其成矿与加里东中、晚期深源中高侵位中酸性侵入体有成因联系。成矿时代集中于 (4 6 2± 1 3)Ma～ (4 36± 32 )Ma ,与加里东期活动大陆边缘俯冲作用过程中的板块重熔—同熔—岩浆分异作用有关 ,由于其形成于区域大规模火山喷发之后 ,深部岩浆有一定分异 ,并存在广泛的矿源层条件 ,对钨的大规模成矿有利。因此 ,寻找大型以上的钨矿床必须综合考虑岩浆作用和矿源层两个主要因素。锰夕卡岩型银 (铅、锌 )The main W-deposit type in the southern margin of North Qilian Caledonian orogen is skarn-quartz vein type which is genetically related to intermediate acid intrusions formed in middle and late Caledonian stage. The main metallogenic age is (462±13)Ma～(436±32)Ma. The W-deposits were formed by oceanic plate re melting-lower crust syntexis-magma differentiation relating to subduction in the active continental margin in the Caledonian cycle. Because the W-deposits were formed after regional intense volcanic eruption, which means enough time to form differentiated magma, it seems favorable to form large scale tungsten deposi ts. To prospect large tungsten deposits in this area, both factors such as magmatism and W-bearing source beds must be considered together.Another target for Prospecting large Ag(Pb,Zn)deposit is manganoan skarn type.

关 键 词：夕卡岩一石英脉型 钨矿床 动力学背景 找矿潜力 北祁连 

分 类 号：P618.41[天文地球—矿床学]