青海省都兰县热水铜钼矿床辉钼矿Re--Os测年及成矿意义  

Re--Os geochronology of molybdenite from Reshui Cu--Mo deposit in Dulan,Qinghai and its geological significance

作　　者：朱德全 朱海波 李宝龙 李洪英[2,3] 李国涛 ZHU De-quan;ZHU Hai-bo;LI Bao-long;LI Hong-ying;LI Guo-tao(The 8th Institute of Geology & Mineral Exploration of Shandong Province, Rizhao 276826, Shandong, China;NLR Key Laboratory of Metallogeny and Mineral Assessment, Beijing 100037,China;Institute of Mineral Resources, China Academy of Geological Sciences, Beijing 100037,China)

机构地区：[1]山东省第八地质矿产勘查院,山东日照276826 [2]自然资源部成矿作用与资源评价重点实验室,北京100037 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《世界地质》2018年第4期1004-1017,共14页World Geology

基　　金：中国地质调查局调查项目(12120114034301);中央级公益性科研院所基本科研业务费专项(K1309)联合资助

摘　　要：为了查明都兰县热水铜钼矿床的形成时间,笔者对其主要铜钼多金属矿体地表和岩芯的6件辉钼矿样品进行了Re--Os同位素分析,辉钼矿Re含量为(5.969±0.042)×10^(-6)～(15.55±0.11)×10^(-6),Re--Os同位素模式年龄分布范围在(233.1±3.1～235.6±3.1)Ma,其年龄加权平均值为(234.2±1.3)Ma(MSWD=0.40),等时线年龄为(234.2±2.8)Ma(MSWD=1.09)。揭示该矿床的成矿时代为晚三叠世早期。结合区域地质特征、地球化学资料和同位素年代学数据,认为该矿床可能形成于东昆仑造山带的后碰撞背景。东昆仑成矿带在三叠纪存在一期广泛的构造-岩浆成矿事件,从祁漫塔格到鄂拉山等地均有出现。In order to identify the formation time of Reshui Cu--Mo deposit,six molybdenite samples from outcrops and core were used for Re-Os isotopic analysis. The dating results showed that Re content ranges from( 5. 969 ± 0. 042) × 10-6^( 15. 55 ± 0. 11) × 10-6,model ages is( 233. 1 ± 3. 1 ~ 235. 6 ± 3. 1) Ma,the weighted average age is( 234. 2 ± 1. 3) Ma( MSWD = 0. 40),the isochron age is( 234. 2 ± 2. 8) Ma( MSWD =1. 09). The data revealed that the metallogenic epoch was early Late Triassic. Combined with regional geology,geochemistry and isotopic geochronology data,the authors suggested that the Reshui Cu--Mo deposit was formed in a post-collisional background of east Kunlun Orogen during Mid-Late Triassic. There existed a widely occurred magmatic-tectonic mineralization event during Triassic in east Kunlun,from Qimantage in the west to Ngola in the east.

关 键 词：铼-锇同位素年龄 辉钼矿 成矿时代 热水 东昆仑 

分 类 号：P618.65[天文地球—矿床学] P597[天文地球—地质学]