| The age of the Gaojiacun mafic-ultramafic intrusive complex in the Yanbian area,Sichuan Province： Geochronological constraints by U-Pb dating of single zircon grains and ^40Ar／^39Ar dating of hornblende |
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| 作者单位： | ZHU Weiguang;;DENG Hailin;;LIU Bingguang;;LI Chaoyang;;QIN Yu;;LUO Yaonan;;LI Zhide;;PI Daohui Open Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China Graduate School,Chinese Academy of Sciences,Beijing 100039,China Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China Geological Team 601,Bureau of Metallurgical Geology and Mineral Exploration,Panzhihua 617027,China Bureau of Geology and Mineral Resources of Sichuan Province,Chengdu 610081,China China University of Geosciences,Wuhan 430074,China Correspondence should be addressed to Zhu Weiguang |
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| 摘 要： | The Gaojiacun mafic-ultramafic intrusivecomplex in the Yanbian area, Sichuan Province, is a strati-form intrusive body that has undergone intensive magmaticdifferentiation. This intrusive body involves two magmaticaccumulating cycles. Systematic U-Pb dating of single zircongrains and ~(40)Ar/~(39)Ar dating of hornblende were conducted,and the results showed that the age of hornblende gabbro,which was formed at the main phase of intrusion of the Gao-jiacun intrusive complex, is 840±5 Ma, casting doubt on theconcept of "Yanbian Ophiolite". It is believed that the for-mation of the Gaojiacun intrusive complex seems to be re-lated to a super-mantl3 plume underneath the su-per-continent Rodinia. The above research results are helpfulfor us to get a better understanding of the characteristics ofNeoproterozoic tectonic evolution of the Yanbian area inSichuan Province.
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| 关 键 词： | 角闪石 高家村 超镁铁质侵入复合物 地质年代学 U-Pb定年 单晶锆石 |
| 收稿时间： | 2004-01-13 |
| 修稿时间： | 2004-03-30 |
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