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内蒙古黄花滩铜镍矿区辉长岩LA-ICP-MS锆石U-Pb定年及地球化学特征
引用本文:赵泽霖,李俊建,党智财,付超,唐文龙,王守光,刘利双,赵丽君.内蒙古黄花滩铜镍矿区辉长岩LA-ICP-MS锆石U-Pb定年及地球化学特征[J].岩矿测试,2016,35(2):208-216.
作者姓名:赵泽霖  李俊建  党智财  付超  唐文龙  王守光  刘利双  赵丽君
作者单位:中国地质科学院研究生部, 北京 100037;中国地质调查局天津地质矿产研究所, 天津 300170,中国地质调查局天津地质矿产研究所, 天津 300170,中国地质科学院研究生部, 北京 100037;中国地质调查局天津地质矿产研究所, 天津 300170,中国地质科学院研究生部, 北京 100037;中国地质科学院地质研究所, 北京 100037,中国地质调查局天津地质矿产研究所, 天津 300170,中国地质调查局天津地质矿产研究所, 天津 300170,内蒙古自治区地质调查院, 内蒙古 呼和浩特 010020,中国地质调查局天津地质矿产研究所, 天津 300170
基金项目:国家国际科技合作项目(2012DFB20220);国土资源公益性行业科研专项(200811010)
摘    要:在乌拉特后旗—达茂旗—四子王旗一带的内蒙古中部地区分布着超基性-酸性连续岩浆系列,开展其岩体年代学、地球化学研究可为内蒙古中部地区与超基性-基性岩有关的铜镍矿成矿规律研究提供基础地质资料,还可以推断岩浆侵位时期的区域大地构造背景。本文以达茂旗黄花滩铜镍矿区出露的辉长岩为研究对象,采用LA-ICP-MS仪器对无裂隙、高透明度、阴极发光均匀、环带清晰的锆石进行U-Pb定年,获得岩体加权平均年龄为262.4±1.1 Ma,并利用XRF和ICP-MS进行岩石地球化学分析显示黄花滩辉长岩具有后碰撞拉伸环境下的岩浆特征。综合前人相关研究认为,内蒙古中部地区于中二叠世晚期(255~275 Ma)已经进入后碰撞构造阶段,而古亚洲洋在该区域的闭合应发生在晚二叠世前(~285 Ma),此结论丰富了古亚洲洋闭合时间上限及中晚二叠世期间内蒙古中部地区构造背景方面的证据。

关 键 词:内蒙古黄花滩铜镍矿区  辉长岩  LA-ICP-MS锆石U-Pb定年  地球化学特征  后碰撞
收稿时间:4/8/2015 12:00:00 AM
修稿时间:3/5/2016 12:00:00 AM

LA-ICP-MS Zircon U-Pb Age and Geochemistry of Gabbros from the Huanghuatan Copper-Nickel Deposit, Inner Mongolia
ZHAO Ze-lin,LI Jun-jian,DANG Zhi-cai,FU Chao,TANG Wen-long,WANG Shou-guang,LIU Li-shuang and ZHAO Li-jun.LA-ICP-MS Zircon U-Pb Age and Geochemistry of Gabbros from the Huanghuatan Copper-Nickel Deposit, Inner Mongolia[J].Rock and Mineral Analysis,2016,35(2):208-216.
Authors:ZHAO Ze-lin  LI Jun-jian  DANG Zhi-cai  FU Chao  TANG Wen-long  WANG Shou-guang  LIU Li-shuang and ZHAO Li-jun
Institution:Graduate Department of Chinese Academy of Geological Sciences, Beijing 100037, China;Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China,Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China,Graduate Department of Chinese Academy of Geological Sciences, Beijing 100037, China;Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China,Graduate Department of Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology Chinese Academy of Geological Sciences Beijing 100037, China,Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China,Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China,Geological Survey Institute of Inner Mongolia, Hohhot 010020, China and Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China
Abstract:A successive series of ultrabasic-acid igneous rocks are discretely distributed in the belt of Urad houqi-Damaoqi-Siziwangqi, ultrabasic-basic. Diagenetic age and geochemistry research of these rocks are conducive to the deduction of the tectonic setting in period of the emplacement of the magma,as well as the accumulation of basic geological data for the metallogenic regularity of copper-nickel deposit related with ultrabasic-basic rocks. This paper is targeted at the the gabbros exposed in the mining pit of Huanghuatan copper-nickel deposit in Damaoqi, and obtained the weighted age (262.4 1.1Ma)of the classical zircons crystallized in basic rocks for the first time with the applicant of LA-ICP-MS zircon U-Pb dating. XRF and ICP-MS method were applied to determine the geochemistry of these samples, and result indicates Huanghuatan gabbros are characterized by the magma formed in the post collision and tensional environment. Synthetically analysis of the igneous series from this paper and previous researches suggests the central region of Inner Mongolia had entered into the post collision phase during the late Permian (255~275 Ma), whereas the close of Paleo-Asian Ocean in this limited area occurred before late Permian (~285Ma). This enriches evidences for the upmost closure time limit in the sectors of diagenesis age and tectonic setting in central part of Inner Mongolia in the period of middle-late Permian.
Keywords:Huanghuatan Copper-Nickel Deposit in Inner Mongolia  gabbro  LA-ICP-MS Zircon U-Pb age  geochemistry feature  post collision
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