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
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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DOI：
10.1111/j.1755-6724.2009.00033.x
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发表时间：
2009-04
期刊：
影响因子：
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通讯作者：
Yuruo Shi;Xitao Zhao;Yin-sheng Ma;D. Hu;Qisheng Liu;Zhenhan Wu;Yuanyi Zhao;Dunyi Liu
中科院分区：
文献类型：
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作者：
Yuruo Shi;Xitao Zhao;Yin-sheng Ma;D. Hu;Qisheng Liu;Zhenhan Wu;Yuanyi Zhao;Dunyi Liu
北京北方云蒙山地质公园位于燕山山脉内。云蒙山岩基主要由云蒙山片麻状花岗岩和石城片麻状闪长岩两个岩体组成。云蒙山片麻状花岗岩中4个样品的SHRIMP锆石U-Pb年龄为145 ~ 141 Ma，石城片麻状闪长岩中4个样品的SHRIMP锆石U-Pb年龄为159 ~ 151 Ma。切割云蒙山闪长岩的脉岩记录了162±2和156±4 Ma的SHRIMP锆石U-Pb年龄。闪长岩中锆石的峰值年龄为155 Ma，无继承锆石核;花岗岩的峰值年龄为142 Ma，表明云蒙山花岗岩体的侵位年龄，其岩浆锆石中含有继承锆石核。这里提供的数据表明，有两个脉冲的岩浆作用：早期的闪长岩，其次是c13马后真正的花岗岩，其中包括来自一个古老的大陆地壳的材料。
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.