| LA-ICP-MS Zircon U-Pb Geochronology of the Fine-grained Granite and Molybdenite?Re-Os?Dating in the Wurinitu Molybdenum Deposit, Inner Mongolia, China |
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| 作者姓名： | LIU Cui DENG Jinfu KONG Weiqiong XU Liquan ZHAO Guochun LUO Zhaohu LI Ning |
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| 作者单位： | 1 State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 The Fourth Institute of Geological and Mineral Exploration of Gansu Province, Jiuquan, Gansu 735000, China; 4 Geological Survey Institute of Inner Mongolia, Hohhot, Inner Mongolia 010020, China |
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| 基金项目： | The study was support by China Geological Survey (1212010911028), NSFC (40802020), Ministry of Land and Resources (1212010633902, 1212010633903 and 121201 0711814), and CUGB (GPMR 0735). We thank Shao Jidong, Shang Hengseng and Tao Jixiong of the Geological Survey Institute of Inner Mongolia for their assistance during the field work and thoughtful discussion. And we appreciate the guidance and help of Lu Songnian.?Meanwhile, thanks are due to Shi Yuruo for the fruitful discussion with him on the zircon.?We also thank You Zhendong, Liu Jiajun and Tian Shihong for their riview of the paper. Single zircon selection was made by Wang Xiaoyan in TCNBCMGB;?LA-ICP?MS, Lu-Hf?isotope analysis and CL were carried out in Northwestern University; reflection photographs and data processing were completed by Liu Yong; molybdenite Re-Os dating by Li Chao and Qu Wenjun from the Chinese Academy of Geological Sciences. To them we are deeply indebted. |
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| 摘 要： | The Wurinitu molybdenum deposit, located in Honggor, Sonid Left Banner of Inner Mongolia, China, is recently discovered and is considered to be associated with a concealed fine-grained granite impregnated with molybdenite.?The wall rocks are composed of Variscan porphyritic-like biotite granite and the Lower Ordovician Wubin’aobao Formation.?LA-ICP-MS zircon U-Pb dating of the fine-grained granite reveals two stages of zircons,?one were formed at 181.7±7.?4 Ma and?the other at 133.6±3.3 Ma. The latter age is believed to be the formation age of the fine-grained granite, while the former may reflect the age of inherited zircons, based on the morphological study of the zircon and regional geological setting. The Re-Os model age of molybdenite is 142.2±2.5?Ma, which is older than the diagenetic age of the fine-grained granite.?Therefore the authors believe that the metallogenic age of the Wurinitu molybdenum deposit should be?nearly 133.6±3.3 Ma or slightly later, i.e., Early Cretaceous.?Combined with regional geological background research, it is speculated that the molybdenum deposits were formed at the late Yanshanian orogenic cycle in the Hingganling-Mongolian orogenic belt, belonging to the relaxation epoch posterior to the compression and was associated with the closure of the Mongolia-Okhotsk?Sea.
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| 关 键 词： | fine-grained granite LA-ICP-MS zircon U-Pb geochronology molybdenite Re-Os dating Wurinitu molybdenum deposit Inner Mongolia |
| 收稿时间： | 2010/6/11 0:00:00 |
| 修稿时间： | 2010/11/15 0:00:00 |
LA‐ICP‐MS Zircon U‐Pb Geochronology of the Fine‐grained Granite and Molybdenite Re‐Os Dating in the Wurinitu Molybdenum Deposit,Inner Mongolia,China |
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| Authors: | LIU Cui DENG Jinfu KONG Weiqiong XU Liquan ZHAO Guochun LUO Zhaohua and LI Ning |
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| Institution: | 1 State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 The Fourth Institute of Geological and Mineral Exploration of Gansu Province, Jiuquan, Gansu 735000, China; 4 Geological Survey Institute of Inner Mongolia, Hohhot, Inner Mongolia 010020, China,1 State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 The Fourth Institute of Geological and Mineral Exploration of Gansu Province, Jiuquan, Gansu 735000, China; 4 Geological Survey Institute of Inner Mongolia, Hohhot, Inner Mongolia 010020, China,1 State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 The Fourth Institute of Geological and Mineral Exploration of Gansu Province, Jiuquan, Gansu 735000, China; 4 Geological Survey Institute of Inner Mongolia, Hohhot, Inner Mongolia 010020, China,1 State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 The Fourth Institute of Geological and Mineral Exploration of Gansu Province, Jiuquan, Gansu 735000, China; 4 Geological Survey Institute of Inner Mongolia, Hohhot, Inner Mongolia 010020, China,1 State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 The Fourth Institute of Geological and Mineral Exploration of Gansu Province, Jiuquan, Gansu 735000, China; 4 Geological Survey Institute of Inner Mongolia, Hohhot, Inner Mongolia 010020, China,1 State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 The Fourth Institute of Geological and Mineral Exploration of Gansu Province, Jiuquan, Gansu 735000, China; 4 Geological Survey Institute of Inner Mongolia, Hohhot, Inner Mongolia 010020, China and 1 State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 The Fourth Institute of Geological and Mineral Exploration of Gansu Province, Jiuquan, Gansu 735000, China; 4 Geological Survey Institute of Inner Mongolia, Hohhot, Inner Mongolia 010020, China |
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| Abstract: | The Wurinitu molybdenum deposit, located in Honggor, Sonid Left Banner of Inner Mongolia, China, is recently discovered and is considered to be associated with a concealed fine‐grained granite impregnated with molybdenite. The wall rocks are composed of Variscan porphyritic‐like biotite granite and the Lower Ordovician Wubin'aobao Formation. LA‐ICP‐MS zircon U‐Pb dating of the fine‐grained granite reveals two stages of zircons, one were formed at 181.7±7. 4 Ma and the other at 133.6±3.3 Ma. The latter age is believed to be the formation age of the fine‐grained granite, while the former may reflect the age of inherited zircons, based on the morphological study of the zircon and regional geological setting. The Re‐Os model age of molybdenite is 142.2±2.5 Ma, which is older than the diagenetic age of the fine‐grained granite. Therefore the authors believe that the metallogenic age of the Wurinitu molybdenum deposit should be nearly 133.6±3.3 Ma or slightly later, i.e., Early Cretaceous. Combined with regional geological background research, it is speculated that the molybdenum deposits were formed at the late Yanshanian orogenic cycle in the Hingganling‐Mongolian orogenic belt, belonging to the relaxation epoch posterior to the compression and was associated with the closure of the Mongolia‐Okhotsk Sea. |
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| Keywords: | fine-grained granite LA-ICP-MS zircon U-Pb geochronology molybdenite Re-Os dating Wurinitu molybdenum deposit Inner Mongolia |
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