| Magmatic Event at the End of the Archean in Eastern Hebei Province and Its Geological Implication |
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| 作者姓名： | GENG Yuansheng LIU Fulai and YANG Chonghui Institute of Geology Chinese Academy of Geological Sciences Beijing |
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| 作者单位： | GENG Yuansheng，LIU Fulai and YANG Chonghui Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037 |
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| 摘 要： | 1 Introduction With a wide distribution of the early Precambrian rocks, eastern Hebei Province is one of the classical regions for early Precambrian study of China. From the 1960s up to now, a great deal of geological surveys and researches have been undertaken in the region. The region was well-known among geologists of the world for the first report of the isotopic age of c. 3500 Ma (Rb-Sr Group, Laboratory of Isotopic Geology and Composite Research Group, Institute of Geology, Academ…
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| 关 键 词： | 太古代 河北 地质运动 花岗岩 |
| 收稿时间： | 2006-04-17 |
| 修稿时间： | 2006-08-21 |
Magmatic Event at the End of the Archean in Eastern Hebei Province and Its Geological Implication |
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| Authors: | GENG Yuansheng LIU Fulai and YANG Chonghui Institute of Geology Chinese Academy of Geological Sciences Beijing |
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| Abstract: | Abstract: By using the SHRIMP U‐Pb and single zircon stepwise evaporation methods, the authors have obtained some results for granitoids from eastern Hebei Province. The Yuhuzhai hyperthene tonalitic granite was formed 2550 Ma ago, the Qingyangshu gabbroic gneiss 2536 Ma, the Yinmahe granodioritic gneiss near Lücao, Lulong County, 2533 Ma, the gabbro‐dioritic gneiss near Longwan, Qianxi County, 2518‐2515 Ma, the Qiuhuayu trondjemitic gneiss at Zunhua 2515 Ma, the Xiaoguanzhuang tonalitic gneiss at Zunhua 2495 Ma, and the Cuizhangzi gneiss in Qianxi County 2492 Ma. These geochronilogical data demonstrate that, though diverse in composition, type and origin, the granitic gneisses in eastern Hebei Province were emplaced and crystallized in a rather short period of magmatic activity. The formation of such a great amount of gneisses in this small time gap suggests that it was a critical crust accretion stage at the end of Neoarchean. The fact that granitoids of various types occurred at the same time implies a large‐scale underplating (mantle plume) activity, which was then responsible for the crust accretion. |
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| Keywords: | orthogneiss magmatic event Neoarchean zircon age eastern Hebei Province |
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