Exposed Cross-section of the Archaean Lower Crustin the Shanxi-Hebei-Inner Mongolia Border Region: Problems and Prospects |
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| Authors: | ZHAO Jing |
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| Institution: | ZHAO JingDepartment of Geology,China University of Geosciences,Xueyuan R,Beijing and QIAN Xianglin Department of Geology,Peking University,Beijing Wang Yi Fei Zhenbi |
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| Abstract: | The Archaean lower crust represented by granulite facies rocks, which is rare in China, is found to be exposed in the Shanxi-Hebei-Inner Mongolia border region. Studies of the regional structure and deformation and metamorphism of the region indicate that there occurred at least two phases of deformation and metamorphism in the region. Early-phase nearly E-W-directed deformational structure is well preserved in the Zhangjiakou-Xuanhua area. Observations of the features of the geological structure from north to south (in the Hengshan metamorphic terrain) have revealed a possible exposed cross-section through the Archaean lower crust. The structure was superimposed by a NE-SW-trending high-temperature ductile shear zone in the Datong area in the late phase, thus reworking the Archaean sequence. |
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| Keywords: | Archaean cross-section of the lower crust Datong area Zhangjiakou-Xuanhua area high-temperature ductile shear zone |
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