内蒙古架子山钼(银)矿床辉钼矿Re-Os同位素年龄及其地质意义  

The molybdenite Re-Os dating of the Jiazishan Mo(Ag) deposit,Inner Mongolia and its geological significance

作　　者：王振亮 赵克强[1,2] 杨剑洲 付燕刚 席明杰 李超 邓友茂[1,2] 陆桂福[1,2] WANG Zhenliang;ZHAO Keqiang;YANG Jianzhou;FU Yangang;XI Mingjie;LI Chao;DENG Youmao;LU Guifu(National Center for Geological Exploration Technology,Langfang,Hebei 065000,China;Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang,Hebei 065000,China;National Research Center for Geoanalysis,Beijing100037,China)

机构地区：[1]国家现代地质勘查工程技术研究中心,河北廊坊065000 [2]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [3]国家地质实验测试中心,北京100037

出　　处：《地质学报》2021年第12期3768-3777,共10页Acta Geologica Sinica

基　　金：国家重点研发计划项目(编号2018YFE0208300);中国地质科学院基本科研业务费项目(编号AS2017J04)联合资助的成果。

摘　　要：本文通过对内蒙古架子山斑岩型钼(银)矿床7件辉钼矿样品的Re-Os同位素测定与分析,获得了辉钼矿的模式年龄介于143.1±2.1~147.2±2.4 Ma之间,加权平均年龄为145.8±1.4 Ma(MSWD=1.5),对应的等时线年龄为147.4±1.4 Ma (MSWD=1.5),表明架子山钼(银)矿床形成于晚侏罗世,属中国东部燕山期大规模钼成矿期成矿。架子山钼(银)矿床Re含量在37.62×10^(-6)~401.34×10^(-6)之间,平均值为121.28×10^(-6),表明架子山钼(银)矿床的成矿物质具有壳幔混源特征。In this paper, the Re-Os isotopic dating of seven molybdenite samples from the Jiazishan Mo(Ag) deposit, Inner Mongolia shows model ages from 143.1±2.1 Ma to 147.2±2.4 Ma, averaging 145.8±1.4 Ma(MSWD=1.5), and a good isochronic age of 147.4±1.4 Ma(MSWD=1.5). It indicates that the Jiazishan Mo(Ag) deposit was formed in the late Jurassic which belongs to the large-scale Mo mineralization of the Yanshan period in eastern China. The Re content of the Jiazishan Mo(Ag) deposit is between 37.62×10^(-6)and 401.34×10^(-6), averaging 121.28×10^(-6). As Re content in molybdenite can be used as an important indicator on source of ore-forming material, it is likely that the ore-forming material in the Jiazishan Mo(Ag) deposit was derived from the crust-mantle mixed source.

关 键 词：RE-OS同位素测年 架子山钼(银)矿床 辉钼矿 内蒙古 

分 类 号：P597.3[天文地球—地球化学] P618.65[天文地球—地质学] P618.52