内蒙古太平沟斑岩型钼矿床Re-Os等时线年龄及其地质意义  

Re-Os Isotopic Chronology of Molybdenite from the Taipinggou Porphyry-type Molybdenum Deposit in Inner Mongolia and Its Geological Significance

作　　者：翟德高[1,2] 刘家军[1,2] 王建平[1,2] 彭润民[1,2] 王守光[3] 李玉玺[3] 常忠耀[3] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学岩石圈构造、深部过程及探测技术教育部重点实验室,北京100083 [3]内蒙古自治区地质调查院,内蒙古呼和浩特010020

出　　处：《现代地质》2009年第2期262-268,共7页Geoscience

基　　金：中国地质大学(北京)大学生创新性实验计划项目;内蒙古自治区政府地质勘查项目;国家重点基础研究发展规划(2006CB403500);高等学校学科创新引智计划(B07011);教育部长江学者和创新团队计划

摘　　要：内蒙古太平沟钼矿床位于中国著名的大兴安岭成矿带北缘,属于环太平洋成矿域和古亚洲洋成矿域的叠加部位。通过对内蒙古太平沟斑岩型钼矿床中辉钼矿Re-Os同位素测定,获得等时线年龄为(130.1±1.3)M a,属于燕山成矿时期。太平沟斑岩型钼矿床是中国东部晚中生代岩浆活动的产物,其成矿动力学背景为中国东部岩石圈处于拉伸减薄的环境。太平沟斑岩型钼矿床的Re含量为(9.9±0.085)×10-6^(69.185±0.616)×10-6,相当于壳幔混合源岩浆矿床辉钼矿中的Re含量,说明成矿物质为深部壳幔混合来源。The Taipinggou porphyry-type molybdenum deposit in Inner Mongolia is located in the north of the well-known Da Hinggan Ling metallogenic belt in China.It lies in the superimposed part of the circum Pacific metallogenic province and the Paleo-Asian Oceanic metallogenic province.Re-Os dating of molybdenite from the Taipinggou porphyry-type deposit gives an isochron age of（130.1±1.3）Ma,and the ore-forming epoch belongs to the Yanshanian mineralization episodes.The Taipinggou molybdenum deposit is formed by the eastern China magmatic activities in late Mesozoic.The metallogenic geodynamics of the deposit is viewed that the lithosphere of east China is under the environment of lithospheric extension and thinning.The Re contents of the Taipinggou molybdenum deposit range from（9.9±0.085）×10-6 to（69.185±0.616）×10-6,which equals to the Re contents of crust-mantle magmatic mixing.It also identifies that the sources of ore-forming materials come from the deep mixing of crust and mantle.

关 键 词：斑岩型钼矿床 RE-OS同位素 太平沟 内蒙古 

分 类 号：P618.65[天文地球—矿床学]