| 中甸春都铜矿区岩体成岩时代及地质意义 |
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| 引用本文： | 杨帆,邹国富,吴静,李峰,姜永果,赵向东.中甸春都铜矿区岩体成岩时代及地质意义[J].大地构造与成矿学,2011,35(2):307-314. |
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| 作者姓名： | 杨帆 邹国富 吴静 李峰 姜永果 赵向东 |
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| 作者单位： | 昆明理工大学国土资源工程学院;中国有色金属工业昆明勘查设计研究院; |
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| 基金项目： | 校企合作项目(kkk0200921083)资助 |
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| 摘 要： | 春都斑岩铜矿床位于中甸铜多金属成矿带的西带南段,矿区主要出露由闪长玢岩和花岗闪长斑岩组成的复式岩体,后者呈岩枝或岩脉产于闪长玢岩体中,并与斑岩铜矿有密切成因关系。本文应用LA-ICP-MS U-Pb定年方法,对闪长玢岩以及花岗闪长斑岩的锆石进行年代学研究。结果表明:岩石中的锆石颗粒为浅黄色-无色透明,呈正方双锥状、柱状的自形晶体,内部发育完好的韵律环带,并具较高的Th/U比值,属典型的岩浆成因锆石;主岩体——闪长玢岩体中的锆石LA-ICP-MS U-Pb年龄为(212±3)Ma,成矿花岗闪长斑岩锆石LA-ICP-MS U-Pb年龄分别为(217±2)Ma和(218±2)Ma。锆石LA-ICP-MS U-Pb年龄数据与地质体穿切关系的矛盾,可能与测试数据较少等因素有关。我们认为,矿区斑岩铜矿的成岩成矿时代均为晚三叠世,与义敦岛弧在237～208Ma之间发生大规模的岛弧岩浆活动相吻合。
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| 关 键 词： | 成岩时代 地质意义 闪长玢岩 花岗闪长斑岩 春都铜矿 云南中甸 |
Ages and Geological Significance of the Porphyries in the Chundu Copper Mining Area in Zhongdian,Yunnan Province |
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| YANG Fan,ZOU Guofu,WU Jing,LI Feng,JIANG Yongguo,ZHAO Xiangdong.Ages and Geological Significance of the Porphyries in the Chundu Copper Mining Area in Zhongdian,Yunnan Province[J].Geotectonica et Metallogenia,2011,35(2):307-314. |
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| Authors: | YANG Fan ZOU Guofu WU Jing LI Feng JIANG Yongguo ZHAO Xiangdong |
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| Institution: | YANG Fan1,ZOU Guofu2,WU Jing1,LI Feng1,JIANG Yongguo1 and ZHAO Xiangdong2(1.Department of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China,2.Kunming Institute of Exploration & Design,China Nonferrous Industry Company Ltd,Kunming 650051,China) |
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| Abstract: | The Chundu porphyry copper deposit is located at the southern part of the western branch of the Zhongdian copper-polymetallic metallogenic belt. The copper mineralization is closely related to the Chundu granite which consists of diorte-porphyrite and dykes or veins of granodiorite-porphyrite intruded the former. The diorite-porphyrite and granodiorite-porphyry are chronologically dated using zircon LA-ICP-MS U-Pb method. The zircon grains are light yellow to colorless transparent,tetragonal bipyramid cryst... |
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| Keywords: | age geological significance diorite-porphyrite granodiorite-porphyry Chundu porphyry copper deposit Zhongdian Yunnan Province |
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