| 引用本文: | 陕 亮1，2 许荣科3 郑有业1,3 张雨莲4 曹 亮5 庞迎春5. 北山地区白山堂铜多金属矿区岩浆岩锆石LA-ICP-MS U-Pb年代学及其地质意义[J]. 中国地质, 2013, 40(5): 1600-1611. |
| SHAN Liang1,2, XU Rong-ke3, ZHENG You-ye1,3, ZHANG Yu-lian4, CAO Liang5, PANG Ying-chun5. Zircon LA-ICP-MS U-Pb chronology of magmatic rock in the Baishantang copper polymetallic deposit of Beishan area, Northwest China[J]. Geology in China, 2013, 40(5): 1600-1611(in Chinese with English abstract). |
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| 北山地区白山堂铜多金属矿区岩浆岩锆石LA-ICP-MS U-Pb年代学及其地质意义 |
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陕 亮1，2 许荣科3 郑有业1,3 张雨莲4 曹 亮5 庞迎春51,2,3,4,5
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1. 中国地质大学（北京）地球科学与资源学院，北京 100083;2. 中国地质调查局发展研究中心，北京 100037;3. 中国地质大学（武汉）地质调查研究院，湖北 武汉 430074;4. 中国地质调查局西安地质调查中心，陕西 西安 710054;5. 中国地质调查局武汉地质调查中心，湖北 武汉 430223
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| 摘要: |
| 提要：北山地区是中国重要成矿区带之一。白山堂铜多金属矿是北山地区最重要的斑岩铜矿之一。本文采用锆石LA-ICP-MS U-Pb定年法测定了白山堂矿区I矿带两类含矿斑岩的同位素年龄。获得的花岗斑岩锆石加权平均年龄（275.0±3.0）Ma（MSWD=1.17），代表了花岗斑岩的结晶年龄（早二叠世）。在流纹斑岩中获得两组年龄，一组系结晶较好的岩浆锆石，加权平均年龄为（371.1±2.8）Ma（MSWD=1.7），表明流纹斑岩的结晶年龄为晚泥盆世；另一组锆石为继承锆石，晶形明显磨圆或包裹于第一组岩浆锆石中，年龄分别为（2627±35）Ma, （2598±35）Ma, （1705±44）Ma, （1722±48）Ma, （1642±51）Ma, （1213±54）Ma，大致分为26亿年、17亿年、12亿年左右的3类。结合地球化学特点，确定流纹斑岩可能与中上地壳在泥盆纪的重熔有关。 |
| 关键词: 白山堂 斑岩铜矿 锆石 LA-ICP-MS 北山 |
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| 基金项目:中国地质调查局新一轮国土资源大调查项目“西部重要成矿带选区研究”（1212010531504）资助。 |
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| Zircon LA-ICP-MS U-Pb chronology of magmatic rock in the Baishantang copper polymetallic deposit of Beishan area, Northwest China |
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SHAN Liang1,2, XU Rong-ke3, ZHENG You-ye1,3, ZHANG Yu-lian4, CAO Liang5, PANG Ying-chun51,2,3,4,5
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1. Faculty of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;2. Development Research Center of China Geological Survey, Beijing 100037, China;3. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, Hubei, China;4. Xi’an Institute of Geology and Mineral Resources, China Geological Survey, Xi’an 710054, Shaanxi, China;5. Wuhan Institute of Geology and Mineral Resources, China Geological Survey, Wuhan 430223, Hubei, China
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| Abstract: |
| Abstract：Beishan area is an important metallogenic belt, and the Baishantang Cu polymetallic deposit is one of the representative porphyry copper deposits. Two kinds of magmatic rocks along ore belt I in the Baishantang ore district were dated by the zircon LA-ICP-MS U-Pb method, which yielded a porphyry granite diagenetic age of （275.0±3.0）Ma (MSWD =1.17) , indicating early Permian. Two groups of ages were obtained for rhyolite porphyry: a magma zircon group of the rhyolite porphyry has an age of （371.1±2.8）Ma (MSWD=1.7) , suggesting late Devonian. The other inheritance zircon group of inheritance zircon with remarkable rounded shape or enveloped in the former group has ages of （2627±35）Ma, （2598±35）Ma, （705±44）Ma, （1722±48）Ma, （1642±51）Ma, （1213±54）Ma, which can be assigned roughly to 2.6 billion years, 1.7 billion years and 1.2 billion years, indicating that the rhyolite porphyry was related to the remelting of the upper-middle crust in late Devonian, as also shown by the geochemical characteristics. |
| Key words: Baishantang porphyry copper deposit zircon LA-ICP-MS Beishan |
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