| Post-Collisional Ductile Extensional Tectonic Framework in the UHP and HP Metamorphic Belts in the Dabie-Sulu Region, China |
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| 作者姓名： | SUO Shutian ZHONG Zengqiu YOU Zhendong and ZHANG Zeming Faculty of Earth Sciences China University of Geosciences Wuhan Institute of Geology Chinese Academy of Geological Science Beijing |
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| 作者单位： | SUO Shutian，ZHONG Zengqiu，YOU Zhendong and ZHANG Zeming Faculty of Earth Sciences，China University of Geosciences，Wuhan 430074 Institute of Geology，Chinese Academy of Geological Science，Beijing 100037 |
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| 摘 要： | The present-day observable tectonic framework of the ultrahigh-pressure (UHP) and high-pressure (HP) metamorphic belts in the Dabie-Sulu region was dominantly formed by an extensional process, mostly between 200 and 170 Ma, following the Triassic collision between the Sino-Korean and Yangtze cratons. The framework that controls the present spatial distribution of UHP and HP metamorphic rocks in particular displays the typical features of a Cordilleran-type metamorphic core complex, in which at least four regional-scale, shallow-dipping detachment zones are recognized. Each of these detachment zones corresponds to a pressure gap of 0.5 to 2.0 GPa. The detachment zones separate the rocks exposed in the region into several petrotectonic units with different P-T conditions. The geometry and kinematics of both the detachment zones and the petrotectonic units show that the exhumation of UHP and HP metamorphic rocks in the Dabie-Sulu region was achieved, at least in part, by non-coaxial ductile flow in the mul
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Post-Collisional Ductile Extensional Tectonic Framework in the UHP and HP Metamorphic Belts in the Dabie-Sulu Region, China |
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| Authors: | SUO Shutian ZHONG Zengqiu YOU Zhendong and ZHANG Zeming Faculty of Earth Sciences China University of Geosciences Wuhan Institute of Geology Chinese Academy of Geological Science Beijing |
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| Institution: | 1. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074;2. Institute of Geology, Chinese Academy of Geological Science, Beijing 100037 |
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| Abstract: | The present-day observable tectonic framework of the ultrahigh-pressure (UHP) and high-pressure (HP) metamorphic belts in the Dabie-Sulu region was dominantly formed by an extensional process, mostly between 200 and 170 Ma, following the Triassic collision between the Sino-Korean and Yangtze cratons. The framework that controls the present spatial distribution of UHP and HP metamorphic rocks in particular displays the typical features of a Cordilleran-type metamorphic core complex, in which at least four regional-scale, shallow-dipping detachment zones are recognized. Each of these detachment zones corresponds to a pressure gap of 0.5 to 2.0 GPa. The detachment zones separate the rocks exposed in the region into several petrotectonic units with different P-T conditions. The geometry and kinematics of both the detachment zones and the petrotectonic units show that the exhumation of UHP and HP metamorphic rocks in the Dabie-Sulu region was achieved, at least in part, by non-coaxial ductile flow in the multi-layered detachment zones, and by coaxial vertical shortening and horizontal stretching in the metamorphic units, under amphibolite- to greenschist-facies conditions, and in an extensional regime. All ductile extensional deformations occurred at depths below 10 to 15 km, i.e. below the brittle/ductile deformation transition. |
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| Keywords: | Dabie-Sulu region UHP-HP metamorphic belt ductile extension detachment zone exhumation |
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