云南武定迤腊厂铜矿含矿石英脉^(40)Ar-^(39)Ar年龄及其意义  

Ar-Ar ISOTOPIC AGE YINACHANG COPPER DEPOSIT, WUDING,YUNNAN PROVINCE, China AND ITS IMPLICATIONS

作　　者：叶霖[1] 刘玉平[1] 李朝阳[1] 刘家军[1] 

机构地区：[1]中国科学院地球化学研究所矿床开放实验室,贵州贵阳550002

出　　处：《矿物学报》2004年第4期411-414,共4页Acta Mineralogica Sinica

基　　金：中国科学院知识创新工程项目(编号:KZCX2 101);中国科学院矿床地球化学开放实验室基金

摘　　要：对武定迤腊厂铜矿成矿期石英进行了40Ar 39Ar同位素年龄测定,得到马鞍形年龄谱,坪年龄为(784 25±0 95)Ma,等时线年龄为(783 93±8 59)Ma。地质特征研究表明:该矿床后期改造作用明显,并非同生沉积或成岩作用早期成矿,而与晋宁期Rodina大陆裂解有关。武定迤腊厂铜矿的形成可能是在Rodinia大陆裂解时,从深部带来大量成矿物质,改造成岩时期初始的矿化,形成矿床的叠加富集和最终定位,晋宁 澄江期是该矿床的主成矿期。The saddle-shaped age spectrum was founded by determining ^(40)Ar/^(39)Ar isotopic age of the Yinachang copper deposit. The result showed that the minerogenetic age is Jinningian (784 Ma). It is obvious that the deposit was reworked by later hydrothermal activities, not resultant from syngenetic mineralization or formed in the early stage of diagenesis. Its mineralization is related with the Jinningian　break-up of the Rodinia continent. It is indicated that the Jinningian-Chunjiangian is the main mineralization stage of the Yinachang copper deposit, the abundant ore-forming materials came from the deep interior of the Earth and original mineralization occurred during the Jinningian-chunjiangian break-up of the Rodinia. It is very important for the ultimate localization of the Yinachang copper deposit.

关 键 词：成矿 ^40AR-^39AR年龄 大陆裂解 石英脉 矿床 等时线年龄 晋宁期 铜矿 矿石 AR同位素 

分 类 号：P618[天文地球—矿床学] P542.5[天文地球—地质学]