内蒙古中部大青山新地沟绿岩带型金矿的成矿时代  

METALLOGENIC AGE OF THE XINDIGOU GREENSTONE BELT-TYPE GOLD DEPOSIT IN THE DAQINGSHAN AREA, CENTRAL INNER MONGOLIA

作　　者：李俊建[1] 周学武[1] 沈保丰[2] 胡凤翔[3] 桑海清[4] 刘晓阳[2] 王建民 李铁军 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中国地质调查局天津地质矿产研究所,天津300170 [3]内蒙古自治区地质调查院,呼和浩特010020 [4]中国科学院地质与地球物理研究所,北京100029 [5]内蒙古自治区地质矿产局,呼和浩特010020

出　　处：《地质与勘探》2005年第5期1-4,共4页Geology and Exploration

基　　金：中国地质调查局项目(编号:200110200038和19991020218003);科技部专项资金项目(编号:2001DIB10056)资助。

摘　　要：内蒙古新地沟金矿床产于大青山太古宙花岗岩-绿岩带中,受色尔腾山群柳树沟组中基性火山岩系和韧性剪切带控制.容矿岩石主要是变安山质-英安质火山岩类.为解决主矿体的形成时代,采用石英40Ar/39Ar法,直接测定了含金石英细脉浸染状矿石中石英的形成时代,结果表明新地沟金矿的形成时代为1991.43～1988.93Ma.由此提出新地沟金矿的成因主要与吕梁期韧性剪切带中的变质变形作用有关.Xindigou gold deposit occurs in Archean granite - greenstone belt in the Daqingshan area of Inner Mongolia. Gold mineralization was controlled by intermediate - basic volcanic rocks of Liushugou formation of Seertenshan group and ductile shear zone. The host rocks mainly are meta- andesitic - dacitic volcanic rocks. In order to solve the problem of formation age of major metallogenic epoch in the Xindigou gold deposit, fast - neutron activation method directly to test 40Ar/39Ar age of quartz in gold - bearing quartz veinlet - disseminated ore is adopted. The results show that the metallogenic epoch of Xindigou gold deposit is among 1991.43 and 1988.93Ma. It is suggested that Xindigou gold deposit is genetically related to metamorphism and deformation of ductile shear zones in the Luliang movement.

关 键 词：成矿时代 新地沟金矿 内蒙古大青山地区 

分 类 号：P618.51[天文地球—矿床学]