浙江省桐村钼矿床Re-Os同位素年龄及地质意义  

Re-Os Dating of Molybdenite from the Tongcun Porphyry molybdenum Deposit in Western Zhejiang Province and Its Geological Implications

作　　者：张世铭[1] 肖渊甫[1] 王强[1] 张雪辉[2] 杨玲[3] 王瑜亮[1] 张春茂[1] 

机构地区：[1]成都理工大学,四川成都610059 [2]南京地质矿产研究所,江苏南京210016 [3]江西省地质矿产勘查开发局,江西南昌33000

出　　处：《地质与勘探》2013年第1期50-57,共8页Geology and Exploration

基　　金：萍乡-绍兴结合带铜多金属成矿规律研究(编号:1212011120846)资助

摘　　要：浙江桐村斑岩型钼矿床位于钦杭成矿带东段,紧邻赣东北成矿带,矿床的形成与燕山早期侵入的同熔型花岗岩有关,含矿岩体的成岩年龄165～168Ma。辉钼矿矿石呈浸染状产于岩体内部或岩体与围岩的接触带。本文首次对矿床中3件辉钼矿样品进行了Re-Os同位素年代学研究,测得辉钼矿的等时线年龄为162.2Ma±1.3(MSWD=0.006),代表了成矿年龄。成矿成岩年龄具有一致性,矿床成因类型为斑岩-矽卡岩型钼(铜)矿床。The Tongcun porphyry molybdenum deposit is located in the east section of the Qinzhou-Hangzhou metallogenic belt, close to the large- scale mineralized concentration area in northeastern Jiangxi Province. The formation of the deposit is related to the syntectiegranite which invaded in the early Yanshan period. The mineralization age of the granite is 165 - 168Ma. The disseminated molybdenite occurs in the contact zone between the intru- sion and alteration zone. Re-Os isotopic age of the three molybdenite samples was measured for the first time, yielding 187 Re - 187 Os isochron age of mo- lybdenite as 161.8 ± 2.2Ma（ MSWD = 0. 006 ）, representing the mineralization age. The ore-forming age is concordant with the rock-forming age, and the deposit is of porphyty-skarn-type molybdenum ore deposits.

关 键 词：桐村斑岩型钼矿辉 钼矿Re—Os同位素年龄 成矿物质来源 浙西地区 

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