| 甘肃北山地区公婆泉铜矿区岩体年龄及其地质意义 |
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| 引用本文： | 吕昶良,杨富强,罗家书,马文富,刘文勋,石伟民.甘肃北山地区公婆泉铜矿区岩体年龄及其地质意义[J].矿产与地质,2021(1):83-89. |
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| 作者姓名： | 吕昶良 杨富强 罗家书 马文富 刘文勋 石伟民 |
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| 作者单位： | 广西壮族自治区地球物理勘察院;中国-东盟地学合作中心（南宁） |
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| 基金项目： | 广西壮族自治区地质矿产勘查开发局“广西关键矿产资源深部勘查人才小高地项目”(2020年度)资助。 |
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| 摘 要： | 为更好地分析甘肃北山地区公婆泉铜矿的成矿时代及成矿过程,对公婆泉铜矿英安斑岩、花岗闪长斑岩进行了LA-ICP-MS锆石U-Pb定年。结果显示,英安斑岩形成于(431.0±8.8)Ma,而花岗闪长斑岩形成于(439.6±7.1)Ma。总结前人的研究成果,认为公婆泉铜矿存在至少两期成矿事件,早期为斑岩成矿,形成于440~430 Ma;晚期为热液叠加,与韧性剪切作用密切相关,形成于372~336 Ma。认为公婆泉—月牙山地体为岛弧带,公婆泉铜矿形成于岛弧环境。
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| 关 键 词： | 公婆泉铜矿 英安斑岩 花岗闪长斑岩 甘肃北山 |
Isotopic age of rock mass in Gongpoquan mining area in Beishan of Gansu and its geological significance |
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| LYU Changliang,YANG Fuqiang,LUO Jiashu,MA Wenfu,LIU Wenxun,SHI Weimin.Isotopic age of rock mass in Gongpoquan mining area in Beishan of Gansu and its geological significance[J].Mineral Resources and Geology,2021(1):83-89. |
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| Authors: | LYU Changliang YANG Fuqiang LUO Jiashu MA Wenfu LIU Wenxun SHI Weimin |
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| Institution: | (Geophysical Survey Institute of Guangxi Zhuang Autonomous Region,Liuzhou 545005,Guangxi,China;China-ASEAN Geosciences Cooperation Center,Nanning 530023,Guangxi,China) |
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| Abstract: | In order to better understand the mineralization age and process of Gongpoquan copper deposit in Beishan area,Gansu,LA-ICP-MS zircon U-Pb dating analysis is caaried out for dacite porphyry and granodiorite porphyry in the mining area.The result indicates that the isotopic ages of dacite porphyry and granodiorite porphyry are(431.0±8.8)Ma and(439.6±7.1)Ma,respectively.According to the previous research result,it is considered that there are at least two mineralization stages in Gongpoquan Cu deposit.The first stage is characterized by porphyry mineralization at 440-430 Ma.The second stage is superimposed by the hydrothermal mineralization which is closely related to the ductile shear process at 372-336 Ma.It is further proposed that Gongpoquan-Yueyashan terrane is an island arc belt,and that Gongpoquan Cu deposit is formed in the island arc environment. |
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| Keywords: | Gongpoquan Cu deposit dacite porphyry granodiorite porphyry Beishan of Gansu |
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