赣南葛藤垇钨钼多金属矿床Re-Os同位素年龄及其地质意义  

Re-Os isotope age of Getengao Tungsten-Molybdenum polymetallic deposit,Southern Jiangxi Province and its geological significance

作　　者：李海立[1] 肖惠良[1] 陈乐柱[1] 范飞鹏[1] LI Hai-li;XIAO Hui-liang;CHEN Le-zhu;FAN Fei-peng(Nanjing Center, China Geological Survey, Nanjing 210016, China)

机构地区：[1]中国地质调查局南京地质调查中心,南京210016

出　　处：《华东地质》2020年第4期351-358,共8页East China Geology

基　　金：中国地质调查局“钦杭成矿带武宁—平江地区钨铜多金属矿地质调查(编号:DD20190153)”项目资助。

摘　　要：葛藤垇钨钼多金属矿床为赣南地区典型的热液石英脉型矿床,矿体主要赋存于燕山期花岗岩中,受NW向及近EW向断裂带控制。通过对该矿床进行详细的野外地质调查,并对矿体中的6个辉钼矿样品进行Re-Os同位素测试分析,获得了187Re-187Os等时线年龄为(159.0±0.4)Ma,加权平均年龄为(162±2)Ma(MSWD=1.3),表明该矿床的成矿时代为燕山早期,与赣南区域成矿事件相吻合。Re/Os值(>4)及187Re含量((69.0~625.4)×10-9)指示矿床成矿物质来源于地壳,为燕山早期第二阶段壳源花岗岩分异演化与岩浆晚期热液共同作用的产物。The Getengao Tungsten-Molybdenum polymetallic deposit in southern Jiangxi Province is a typical hydrothermal quartz vein type deposit.The ore bodies of Getengao deposit are mainly occured in the Yanshanian granite and controlled by NW and EW striking faults.In this paper,the Re-Os isotopic dating of six molybdenite samples which collected from the main ore body in Getengao deposit was carried out.the results yield a 187Re-187Os isochron age of(159.0±0.4)Ma,with a weighted average age of(162±2)Ma(MSWD=1.3),representing the mineralization age is early Yanshan Period,which is concurrent with the regional metallogenic events.The high Re/Os ratio(>4)and low 187Re content((69.0~625.4)×10-9)indicate that the metallogenic material was derived from the crust.We suggest that the formation of the deposit is genetically related to the interaction between differentiation and evolution of the crustal-derived granites of the second stage Yanshanian and the hydrothermal process of the granites during lithosphere extension in South China.

关 键 词：赣南地区 钨钼矿床 RE-OS同位素年龄 辉钼矿 

分 类 号：P618.67[天文地球—矿床学] P618.65[天文地球—地质学]