| Structural Analysis of Jianglang Metamorphic Core Complex in Western Margin of yangtze Crston,Sichuan Province |
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| 作者姓名： | Song Honglin Fu Zhaoren Yan Danping |
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| 作者单位： | Song Honglin Fu Zhaoren Yan DanpingDepartment of Geology and Mineral Resources，China University of Geosciences，Beijing 100083 |
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| 基金项目： | The study is supported by the key project of science and technology of the Ministry of Geology and Mineral Resources (NO .85-01-005-1 ) |
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| 摘 要： | There is a belt of metamorphic core complexes in the western margin of the Yangtze craton . The geological setting of the belt is similar to that of the Cordilleran metamorphic core complexes . A typical one in this belt is the Jianglang metamorphic core complex , which has a configuration consisting of three layers :a core complex consisting of Mesoproterozoic schist sequence , a ductile middle slab consisting of Paleozoic meta-sedimentary-basalt characterized by the development of "folding layer" and an upper cover consisting of Xikang Group which has suffered both buckling and flattening . A detachment fault developed along the contact boundary between the cover and basement causes the omission of Upper Sinian and Cambrian at the base of cover . A lot of normal ductile shear zones developed in the cover causes the thinning of it . All the features show that the early extension results in the thinning of crust , but the formation of the dome and exposure of basement rocks may be the results of superimp
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Structural Analysis of Jianglang Metamorphic Core Complex in Western Margin of Yangtze Craton , Sichuan Province* |
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| Song Honglin,Fu Zhaoren,Yan Danping.Structural Analysis of Jianglang Metamorphic Core Complex in Western Margin of yangtze Crston,Sichuan Province[J].Journal of China University of Geosciences,1995(2). |
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| Authors: | Song Honglin Fu Zhaoren Yan Danping |
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| Institution: | Song Honglin Fu Zhaoren Yan DanpingDepartment of Geology and Mineral Resources,China University of Geosciences,Beijing 100083 |
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| Abstract: | There is a belt of metamorphic core complexes in the western margin of the Yangtze craton . The geological setting of the belt is similar to that of the Cordilleran metamorphic core complexes . A typical one in this belt is the Jianglang metamorphic core complex , which has a configuration consisting of three layers : a core complex consisting of Mesoproterozoic schist sequence . a ductile middle slab consisting of Paleozoic meta- sedimentary -basalt characterized by the development of " folding layer" and an upper cover consisting of Xikang Group which has suffered both buckling and flattening . A detachment fault developed along the contact boundary between the cover and basement causes the omission of Upper Sinian and Cambrian at the base of cover . A lot of normal ductile shear zones developed in the cover causes the thinning of it . All the features show that the early extension results in the thinning of crust , but the formation of the dome and exposure of basement rocks may be the results of superimposing of the E-W directed contraction and the following southward thrusting during Indosinian to Yanshanian orogeny . Syntectonic plutonism and pervasive thermo - metamor-phism in the cover suggest that the thermal uplift also causes the uplift of the MCC . |
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| Keywords: | metamorphic core complex extensional structure western margin of Yangtzecraton thermal uplift |
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