豫西沙坡岭钼矿床辉钼矿Re-Os同位素年龄及其地质意义  

Re-Os ISOTOPIC DATING OF MOLYBDENITES FROM THE SHAPOLING MOLYBDENUM DEPOSIT IN WESTERN HENAN PROVINCE AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：刘军[1,2] 武广[1,3] 贾守民 李忠权[5] 孙亚莉[6] 钟伟[1] 朱明田[1,2] 

机构地区：[1]中国科学院广州地球化学研究所成矿动力学重点实验室,广东广州510640 [2]中国科学院研究生院,北京100049 [3]中国地质科学院矿产资源研究所,北京100037 [4]河南省灵宝市黄金机械有限责任公司,河南灵宝472500 [5]油气藏地质及开发工程国家重点实验室(成都理工大学),四川成都610059 [6]中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室,广东广州510640

出　　处：《矿物岩石》2011年第1期56-62,共7页Mineralogy and Petrology

基　　金："十一.五"国家科技支撑计划项目(编号:2006BAB01A02和2007BAB25B03);河南省灵宝市金源矿业有限责任公司博士后项目(200906001)

摘　　要：河南省沙坡岭钼矿床是东秦岭钼矿带东段新发现的热液脉型钼矿床,通过对矿石中5件辉钼矿样品的Re-Os同位素定年,获得125.4 Ma^129.4 Ma的模式年龄,加权平均年龄为127.22 Ma±0.85 Ma,得到一个相关性较好的128.1 Ma±7.1 Ma的等时线年龄,表明沙坡岭钼矿床形成于燕山中晚期。沙坡岭钼矿床辉钼矿的w(Re)高达147.2×10-6~307.8×10-6,与陕西黄龙铺钼矿床中的Re质量分数接近,表明有幔源物质和/或流体参与了成矿过程,暗示沙坡岭钼矿床的形成与中国东部的大规模岩石圈减薄事件有关。沙坡岭钼矿床深部可能存在斑岩型钼矿化,具有较大的找矿潜力。The newly discovered Shapoling Mo deposit in the East Qinling Mo ore belt,Henan Province,is a hydrothermal vein-type Mo deposit.Five samples of molybdenite for Re-Os isotopic dating were analyzed and the model ages obtained ranged from 125.4 Ma to 129.4 Ma,with an average of 127.22 Ma±0.85 Ma,and with an isochronic age of 128.1 Ma±7.1 Ma.The age dating indicated that Shapoling Mo deposit was formed in the Middle-Late Yanshanian Period.The Re contents of the molybdenite in the Shapoling Mo deposit were up to 147.2×10-6~ 307.8×10-6,close to Re content of the Huanglongpu Mo deposit in Shanxi Province.It is showed that the formation of the Shapoling Mo deposit was related to large lithosphere thinning event of eastern China and the mantle-derived material and/or fluid was involved in ore-forming process.The porphyry Mo mineralization with great prospecting potential may exist in deep of the Shapoling Mo deposit.

关 键 词：RE-OS同位素定年 辉钼矿 沙坡岭钼矿床 豫西地区 东秦岭钼矿带 

分 类 号：P618.65[天文地球—矿床学] P597.3[天文地球—地质学]