内蒙古乌拉特后旗查干德尔斯钼矿床地质特征及Re-Os测年  

Geological characteristics and Re-Os dating of molybdenites in Chagandeersi molybdenum deposit,western Inner Mongolia

作　　者：蔡明海[1] 彭振安[1] 屈文俊[2] 贺钟银 冯罡 张诗启[1] 徐明[1] 陈艳[1] 

机构地区：[1]广西大学资源与冶金学院,广西南宁530004 [2]国家地质实验测试中心,北京100037 [3]内蒙古自治区第八地质矿产勘查开发院,内蒙古乌海016000

出　　处：《矿床地质》2011年第3期377-384,共8页Mineral Deposits

基　　金：内蒙古自治区地质矿产勘查开发局"内蒙古自治区内生金属成矿规律及靶区筛选(ND2007004)"项目的资助

摘　　要：查干德尔斯钼矿床是近年来在内蒙古西部中蒙边境地区新发现的一个具大型规模的隐伏矿床,辉钼矿化呈浸染状、团块状、细脉状分布在中细粒二长花岗岩中,具斑岩型矿床的特点。笔者在矿区成矿岩体、矿化和蚀变特征等初步研究的基础上,进行了辉钼矿Re-Os测年,获得模式年龄为(240.3±3.9)^(244.2±3.5)Ma,等时线年龄为(243.0±2.2)Ma〔MSWD=0.78,187Os初始值为(-0.3±2.4)〕,表明区内的钼成矿时代为三叠纪,属印支期构造-岩浆活动的产物。笔者经研究认为,内蒙古西部中蒙边境地区的额济纳旗—乌拉特后旗—苏尼特左旗一线为一钼多金属成矿带,并初步总结了该成矿带内成矿岩体和钼矿床的特征及找矿标志。The Changandeersi molybdenum deposit is a concealed large-size molybdenum deposit newly discovered in western Inner Mongolia.It is a porphyry molybdenum deposit characterized by disseminated,spot and veinlet mineralizations hosted in medium-fine grained monzonitic granite.Re-Os isotopic dating of seven samples from various ore bodies of the ore deposit yields model ages between（240.3±3.9） Ma and（244.2±3.5） Ma,and isochron age of（243.0±2.2） Ma,with initial 187Os being（-0.3±2.4） and MSWD being 0.78,indicating that molybdenum mineralization took place in Triassic and had a association with tectonomagmatic orogenic process in Indosinian period.The Ejin Banner-Urad Rear Banner-Sonid Left Banner belt in western Inner Mongolia near the Sino-Mongolian boundary is considered to be a molybdenum-polymetallic ore belt.The characteristics of granites related to mineralization and molybdenum deposits in this ore belt and the prospecting criteria are summed up in this paper.

关 键 词：地质学 矿床特征 RE-OS测年 查干德尔斯钼矿 内蒙古西部地区 

分 类 号：P618.65[天文地球—矿床学]