| Late Jurassic–Early Cretaceous Plutonism in the Northern Part of the Precambrian North China Craton: SHRIMP Zircon U–Pb Dating of Diorites and Granites from the Yunmengshan Geopark, Beijing |
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| 作者姓名： | SHI Yuruo ZHAO Xitao MA Yinsheng HU Daogong LIU Qisheng WU Zhenhan ZHAO Yuanyi LIU Dunyi |
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| 作者单位： | Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| 基金项目： | This study is financially supported by the National Natural Science Foundation of China (no.: 40703012), the Basic Outlay of Scientific Research Work from the Ministry of Science and Technology of the People’s Republic of China (no.: J0809), and Miyun Tourism Administration for the Yunmengshan National Geopark. |
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| 摘 要： | The Yunmengshan Geopark in northern Beijing is located within the Yanshan range. It contains the Yunmengshan batholith, which is dominated by two plutons: the Yunmengshan gneissic granite and the Shicheng gneissic diorite. Four samples of the Yunmengshan gneissic granite give SHRIMP zircon U–Pb ages from 145 to 141 Ma, whereas four samples of the Shicheng gneissic diorite have ages from 159 Ma to 151 Ma. Dikes that cut the Yunmengshan diorite record SHRIMP zircon U–Pb age of 162±2 and 156±4 Ma. The cumulative plots of zircons from the diorites show a peak age of 155 Ma, without inherited zircon cores, and the peak age of 142 Ma for granite is interpreted as the emplacement age of the Yunmengshan granitic pluton, whose igneous zircons contain inherited zircon cores. The data presented here show that there were two pulses of magmatism: early diorites, followed c13 Ma later by true granites, which incorporated material from an older continental crust.
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| 关 键 词： | SHRIMP zircon U–Pb age Yunmengshan Geopark North China Craton |
| 收稿时间： | 2008/3/24 0:00:00 |
| 修稿时间： | 2008/12/11 0:00:00 |
Late Jurassic–Early Cretaceous Plutonism in the Northern Part of the Precambrian North China Craton: SHRIMP Zircon U–Pb Dating of Diorites and Granites from the Yunmengshan Geopark,Beijing |
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| Authors: | Yuruo SHI Xitao ZHAO Yinsheng MA Daogong HU Qisheng LIU Zhenhan WU Yuanyi ZHAO Dunyi LIU |
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| Institution: | 1. Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;4. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | The Yunmengshan Geopark in northern Beijing is located within the Yanshan range. It contains the Yunmengshan batholith, which is dominated by two plutons: the Yunmengshan gneissic granite and the Shicheng gneissic diorite. Four samples of the Yunmengshan gneissic granite give SHRIMP zircon U–Pb ages from 145 to 141 Ma, whereas four samples of the Shicheng gneissic diorite have ages from 159 Ma to 151 Ma. Dikes that cut the Yunmengshan diorite record SHRIMP zircon U–Pb age of 162±2 and 156±4 Ma. The cumulative plots of zircons from the diorites show a peak age of 155 Ma, without inherited zircon cores, and the peak age of 142 Ma for granite is interpreted as the emplacement age of the Yunmengshan granitic pluton, whose igneous zircons contain inherited zircon cores. The data presented here show that there were two pulses of magmatism: early diorites, followed c13 Ma later by true granites, which incorporated material from an older continental crust. |
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| Keywords: | SHRIMP zircon U–Pb age Yunmengshan Geopark North China Craton |
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