| The Yaean Metamorphic Core Complex and Extensional Detachment Fault in Inner Mangolia, China |
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| 作者姓名： | Zheng Yadong and Zhang Qing |
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| 作者单位： | Zheng Yadong and Zhang QingDepartment of Geology，Peking University |
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| 基金项目： | Project 49070135 supported by the National Natural Science Foundation of China |
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| 摘 要： | The article describes the characteristics of the Yagan metamorphic core complex, especially the associated detachment fault and various extensional structures in its footwall. The age of the complex is discussed in some detail as well. The basic features of the Yagan metamorphic complex (Jurassic in age) are similar to those of the metamorphic core complex (Tertiary in age) in the Cordilleran area; they are as follows: (a) mylonitic gneisses in the footwall, (b) chloritized sheared mylonitic rocks, (c) pseudotachylites and flinty cataclasites or microbreccias, (d) unmetamorphosed or epimetamorphic rocks in the hanging wall with a layer of fault gouges or incohesive fault breccia next to the detachment fault. In contrast to its Cordilleran counterpart, however, there are many extensional faults with different styles (from dactile low-angle normal faults through brittle-ductile to brittle high-angle normal faults)in the footwall.
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The Yaean Metamorphic Core Complex and Extensional Detachment Fault in Inner Mangolia, China |
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| Authors: | Zheng Yadong and Zhang Qing |
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| Institution: | Zheng Yadong and Zhang QingDepartment of Geology,Peking University |
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| Abstract: | The article describes the characteristics of the Yagan metamorphic core complex, especially the associated detachment fault and various extensional structures in its footwall. The age of the complex is discussed in some detail as well. The basic features of the Yagan metamorphic complex (Jurassic in age) are similar to those of the metamorphic core complex (Tertiary in age) in the Cordilleran area; they are as follows: (a) mylonitic gneisses in the footwall, (b) chloritized sheared mylonitic rocks, (c) pseudotachylites and flinty cataclasites or microbreccias, (d) unmetamorphosed or epimetamorphic rocks in the hanging wall with a layer of fault gouges or incohesive fault breccia next to the detachment fault. In contrast to its Cordilleran counterpart, however, there are many extensional faults with different styles (from dactile low-angle normal faults through brittle-ductile to brittle high-angle normal faults)in the footwall. |
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| Keywords: | mylonite ultracataclasite pseudotachylite brittle-ductile fault in the footwall |
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