西藏邦铺大型斑岩钼-铜矿床二长花岗斑岩锆石SHRIMP定年及其地质意义  

Zircon U-Pb SHRIMP Dating of the Monzonite Granite-Porphyry from the Bangpu Large Porphyry Molybdenum-Copper Deposits,Tibet,and its geological Significance

作　　者：周雄[1,2] 温春齐[1] 温泉[1] 吴鹏宇[1] 曹盛远 费光春[1] 霍艳[1] 周玉[1] 

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]中国地质科学院矿产综合利用研究所,成都610041 [3]四川省地质矿产开发局109地质队,成都610100

出　　处：《矿物岩石地球化学通报》2010年第4期373-379,共7页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金："十一五"国家科技支撑计划项目(2006BAB01A04);成都理工大学矿物学;岩石学;矿床学国家重点(培育)学科建设项目(SZD0407)

摘　　要：利用锆石U-Pb SHRI MP定年技术,测定了西藏冈底斯斑岩铜矿带东段邦铺斑岩钼铜矿床中二长花岗斑岩的年龄,获得该含矿岩体真实侵位年龄为13.9±0.3 Ma（MSWD=3.05）,属于喜马拉雅晚期。邦铺二长花岗斑岩的形成时代介于冈底斯成矿带后碰撞期伸展构造环境的斑岩体的形成时代（12～18 Ma）,该年龄的厘定进一步丰富了冈底斯带岩浆活动,并为整个冈底斯成矿带岩浆岩演化历史提供年代学数据和新的启示：可以认为其与冈底斯斑岩铜矿带具有相同的动力学背景,同属于大规模的快速爆发成矿作用过程。The zircon U-Pb SHRIMP technique was applied to measure the age of the monzonite granite-porphyry from the Bangpu porphy deposits in the eastern Gangdese porphyry belt.It was obtained that the 206Pb/238U mean age is 13.9±0.3 Ma（MSWD =3.05）,which belongs to the late period of Himalaya.The Bangpu monzonite granite-porphyry was formed during the period of ore-bearing porphyries forming in the Gangdese metallogenic belt to the extension environment of post-collision（12～18 Ma）.Our new data suggest that the Bangpu monzonite granite-porphyry shared similar metallogenic dynamics settings to the Gangdese copper belt,which belongs to a rapid outbreak of large-scale mineralization process.Our new result is very important in confirming the active time of the Gangdese magma,provides chronological data and new inspiration for evolution studies of the whole Gangdese metallogenic belt.

关 键 词：U-PB SHRIMP定年 锆石 二长花岗斑岩 斑岩钼铜矿床 西藏邦铺 

分 类 号：P597.3[天文地球—地球化学]