巴尔喀什成矿带阿克沙套云英岩型钨钼矿床地质特征与铼—锇同位素测年分析  

GEOLOGICAL CHARACTERISTICS AND RE-OS ISOTOPIC DATING OF AKSHATAU GREISEN-TYPE W-MO DEPOSIT IN BALKHASH METALLOGENIC BELT

作　　者：李勇[1] 陈宣华[2] 屈文俊[3] 王志宏[2] 杨农[2] 陈正乐[2] 韩淑琴[2] 

机构地区：[1]中国地质科学院,北京100037 [2]中国地质科学院地质力学研究所,北京100081 [3]国家地质实验测试中心,北京100037

出　　处：《地质力学学报》2010年第4期349-358,共10页Journal of Geomechanics

基　　金：国家科技支撑计划重点项目(编号:2007BAB25B02)资助

摘　　要：哈萨克斯坦阿克沙套大型钨钼矿床处于中亚成矿域巴尔喀什成矿带内。该矿床为云英岩型浸染状矿床,具有云英岩型矿床的典型矿物组合、围岩蚀变、矿体形态和结构构造。矿区产出有伟晶岩、石英长石脉,含有钨钼矿、石英和黄玉云英岩矿体等。本文对阿克沙套钨钼矿床辉钼矿样品进行了铼—锇同位素分析,得到辉钼矿模式年龄(平均值)为289.3 Ma,处在早二叠世。分析认为,阿克沙套云英岩型钨钼成矿作用是晚石炭世中亚成矿域大规模斑岩型铜钼成矿作用延续的结果,属中亚造山带海西晚期构造—岩浆活动的产物。The Akshatau disseminated Be-W-Mo deposit is a large-scale greisen-type deposit in the Balkhash metallogenic belt of Central Asian Metallogenic Domain,with typical mineral compositions,wall rock alterations,ore body shapes,and ore texture and structures of greisen-type deposit.The ore field has yielded pegmatites and quartz feldspar veins,bearing W-Mo minerals,quartz and topaz greisen.In this paper,an average molybdenite model age of 289.3 Ma has been obtained through Re-Os isotopic dating for the molybdenite samples from Akshatau W-Mo deposit,suggesting greisen-type W-Mo mineralization in the Early Permian.The Akshatau greisen-type W-Mo mineralization is considered to be the continuation of the Late Carboniferous large-scale porphyry copper-molybdenum mineralization in the Central Asian Metallogenic Domain and a product of the Late Hercynian tectono-magmatic activity in the Central Asia Orogeny.

关 键 词：铼—锇同位素年龄 辉钼矿 成矿时代 云英岩型钨钼矿床 巴尔喀什成矿带 

分 类 号：P618.4[天文地球—矿床学]