江西新余良山钼矿锆石U-Pb和辉钼矿Re-Os年龄  

Zircon U-Pb and molybdenite Re-Os dating of the Liangshan Mo deposit in Xinyu City,Jiangxi Province

作　　者：伍俊杰[1,2] 陈正乐[2,3] 陈瑞莉[2] 潘家永[2] 韩凤彬[3] 付蕾[2,4] 沈滔[2] WU Junjie;CHEN Zhengle;CHEN Ruili;PAN Jiayong;HAN Fengbin;FU Lei;SHEN Tao(Geological Survey of Anhui Province, Hefei 230001, Anhui, China;East China University of Technology, Nanchang 330013, Jiangxi, China;Institute of Geomechanics,Chinese Academy of Geological Sciences, Beijing 100081, China;Jiangxi Central South Exploration Institute of Geology and Mineral Resources, Nanchang 330013, Jiangxi, China)

机构地区：[1]安徽省地质调查院,安徽合肥230001 [2]东华理工大学地球科学学院,江西南昌330013 [3]中国地质科学院地质力学研究所,北京100081 [4]赣中南地质矿产勘查研究院,江西南昌330013

出　　处：《地质通报》2017年第8期1407-1416,共10页Geological Bulletin of China

基　　金：国家自然科学基金项目<天山造山带中-新生代再造过程与砂岩型铀矿成矿作用>(批准号:U1403292);中国地质调查局项目<矿田构造研究方法综合集成>(编号:121201120936);"十二五"国家科技支撑计划项目<西南天山金锑矿成矿系统与靶区优选评价>(编号:2015BAB05B04-01)

摘　　要：良山钼矿是钦杭成矿带近年发现的大中型矿床,在矿化特征分析的基础上,对其进行了成岩成矿年代学研究。采用LAICP-MS锆石U-Pb测年技术,得到矿区内石英闪长斑岩的成岩年龄为168.2±2.3Ma。通过矿床辉钼矿Re-Os同位素分析,获得其等时线年龄为168.9±1.4Ma。指示成岩作用与成矿作用同时发生,含矿热液活动与岩浆活动有密切的关系,岩浆活动可能是形成良山钼矿床的重要因素。良山钼矿床的成矿时间与钦杭成矿带内华南燕山期第一阶段大规模多金属矿化时间(170Ma)吻合。良山钼矿床形成于同一区域成矿背景下,是区域构造岩浆作用的产物,为华南燕山期成矿作用的组成部分。The Liangshan molybdenum deposit was found in the western region of the Wugongshan-Qianshan subzone a few years ago.Based on an analysis of the mineralization features of the deposit,the authors determined LA-ICP-MS zircon U-Pb ages for the ore-bearing rocks in the Liangshan deposit.U-Pb dating of zircon by LA-ICP-MS reveals that the intrusion age of the Liangshan porphyry granite is168.2±2.3Ma.The187Re and187Os values of molybdenum from the molybdenum deposit were determined by the Inductively Coupled Plasma Mass Spectrometry(ICP-MS).Re-Os isochron of molybdenum suggests that the metallogenic epoch of the deposit is168.9±1.4Ma,indicating that this deposit had a close relation with its host rocks,the magmatic activity had a close relationship with ore-bearing hydrothermal activities,and magmatic activity was an important factor for the formation of the Liangshan molybdenum deposit.The metallogenic time of the Liangshan molybdenum deposit is consistent with south China first stage large-scale polymetallic mineralization of Yanshanian period(170Ma).The Liangshan molybdenum deposit was formed in the same regional metallogenic setting and resulted from regional tectonic magmatism,as a part of the South China Yanshanian mineralization.

关 键 词：锆石U-PB年龄 辉钼矿RE-OS年龄 斑岩型钼矿床 良山 钦杭成矿带 

分 类 号：P597.3[天文地球—地球化学] P618.2[天文地球—地质学]