| Cenozoic Tectonic Deformation and Related Geodynamics in the Western Part of Sichuan and Yunnan,Southwest China |
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| 作者姓名： | Gao MingxiuInstitute of Geology SSB Beijing China |
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| 作者单位： | Gao MingxiuInstitute of Geology，SSB，Beijing 100029，China |
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| 摘 要： | Tectonic deformation of Cenozoic strata,youthful tectonontorphology,and high seismicity in the western part of Sichuan and Yunnan(Southwest China)marked intensive tectonism there during the Ceno7oic.It is a good place for studying the continental geodynamics because it is far away from those active plate boundaries surrounding the East Asian continent but near the southeastern margin of the Qinghai-Xizang(Tibet)plateau.The present study discriminated two phases of tectonic deformation with quite different styles in Cenozoic.Early compression deformation,expressed by folds,thrust,and even nappe structure,mainly occurred between the middle and late Eocene.Late extension deformation expressed by block-faulting started at least in the late Pliocene.Nonconformity,absence of strata,nonsuccessive tectonism,and inverse movement of the faults in late stages illustrated that two different deformation phases should be caused by different geodynamic processes.The early compression deformation would be related to Ar
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Cenozoic Tectonic Deformation and Related Geodynamics in the Western Part of Sichuan and Yunnan,Southwest China |
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| Gao MingxiuInstitute of Geology,SSB,Beijing ,China.Cenozoic Tectonic Deformation and Related Geodynamics in the Western Part of Sichuan and Yunnan,Southwest China[J].Earthquake Research in China,1995(4). |
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| Authors: | Gao MingxiuInstitute of Geology SSB Beijing China |
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| Institution: | Gao MingxiuInstitute of Geology,SSB,Beijing 100029,China |
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| Abstract: | Tectonic deformation of Cenozoic strata,youthful tectonontorphology,and high seismicity in the western part of Sichuan and Yunnan(Southwest China)marked intensive tectonism there during the Ceno7oic.It is a good place for studying the continental geodynamics because it is far away from those active plate boundaries surrounding the East Asian continent but near the southeastern margin of the Qinghai-Xizang(Tibet)plateau.The present study discriminated two phases of tectonic deformation with quite different styles in Cenozoic.Early compression deformation,expressed by folds,thrust,and even nappe structure,mainly occurred between the middle and late Eocene.Late extension deformation expressed by block-faulting started at least in the late Pliocene.Nonconformity,absence of strata,nonsuccessive tectonism,and inverse movement of the faults in late stages illustrated that two different deformation phases should be caused by different geodynamic processes.The early compression deformation would be related to Arakan Yoma orogeny rather than directly to the Himalayas,but the late extension deformation in both the Himalayas and the western part of Sichuan and Yunnan can be traced to the same source,which should be related to the deeper geodynamic process,not directly derived from Himalayan collision.If so,current simple models,which suggest that Himalayan collision is responsible for deformation in western Sichuan,and Yunnan,and even throughout Asia,can hardly be proved. |
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| Keywords: | geodynamics compressional deformation tectonic movement Sichuan western Yunnan |
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