摘要
贵州黔东南州从江那哥铜多金属矿床位于扬子陆块与华夏陆块过渡带的江南造山带西南段。矿床赋存于青白口系甲路组(Qbj)和乌叶组(Qbw)的浅变质沉积岩中,受近南北向宰便区域断层F1和近东西向F2断层控制,矿体产在F2断裂破碎带内。区内新元古代岩浆活动频繁,超基性、基性和酸性岩浆广泛发育,以摩天岭花岗岩为规模最大;岩浆活动与成矿关系密切,铜多金属矿床就产于那哥、加榜辉绿岩旁。热液矿物石英包裹体H、O同位素组成表明,成矿流体来源于岩浆水,并有部分变质水参与,矿石硫化物S同位素组成暗示物质可能来源于深部,矿石、地层及岩体Pb同位素组成表明那哥、加榜基性侵入岩和赋矿变质沉积岩地层均为成矿提供了部分物质,岩浆活动为成矿提供了热源。综合该矿床地质地球化学特征,初步认为该矿床应为岩浆热液型多金属硫化物矿床。
The Nage Cu polymetallic ore deposit locates in the southwestern Jiangnan orogenic belt,a transitional zone of the Yangtze craton and the cathaysia.The ore body occurs in metamorphosed sedimentary rocks of the Jialu（Qbj） and the Wuye（Qbw） formations of the Qingbaikou System,and is controlled by north-to-south orientated F1 fault and west-to-east orientated F2 fault.Studies had revealed that magmatic activities of the neoproterozoic were very active in this region,ultra-basic rocks,basic rocks,and acid intrusive rocks were widely developed,and the largest magmatic rock of this region is the Motianling granite.The ores apparently relate with the magmatic activities of neoproterozoic and usually can be found in the Nage and Jiabang diabase.The H and O isotopic compositions of quartz indicated that the ore-forming fluids mainly came from magmatic water and partially assimilated with metamorphic water;the S isotopic compositions of sulfides implicated that the ore-forming sulfur is of anatectic origin;the Pb isotope ratios suggested the Nage and Jiabang diabase and the metamorphosed sedimentary rocks are the parent-material for the deposit,while the magmatic activities provided necessary thermal energy.After summarized the geology and geochemistry data,we believed that the Nage Cu polymetallic deposit is a magmatic-hydrothermal polymetallic deposit.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2010年第2期202-209,共8页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点基础研究发展规划项目(2007CB411402)
中国科学院地球化学所与贵州地矿局102队合作项目
中国科学院地球化学研究所矿床地球化学国家重点实验室开放基金项目(2009014)
