| 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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| 作者单位： | SHI Yuruo,LIU Dunyi(Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China);ZHAO Xitao(Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China);MA Yinsheng,HU Daogong,LIU Qisheng,WU Zhenhan(Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China);ZHAO Yuanyi(Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China)
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| 基金项目： | 国家自然科学基金，Basic Outlay of Scientific Research Work from the Ministry of Science and Technology of the People's Republic of China，Miyun Tourism Administration for the Yunmengshan NationalGeopark |
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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 UPb age of 162±2 and 156±4 Ma.The cumulative pl...
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| 关 键 词： | 锆石SHRIMP 片麻状花岗岩 地质公园 云蒙山 闪长岩 晚侏罗世 前寒武纪 早白垩世 |
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: | SHI Yuruo ZHAO Xitao MA Yinsheng HU Daogong LIU Qisheng WU Zhenhan ZHAO Yuanyi LIU Dunyi Beijing SHRIMP Center |
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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 hatholith, which is dominated by two phitons: 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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