| 大别山早白垩世变质核杂岩的结构与演化 |
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| 引用本文： | 冀文斌,林伟,石永红,王清晨,褚杨.大别山早白垩世变质核杂岩的结构与演化[J].地质科学,2011,46(1):161-180. |
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| 作者姓名： | 冀文斌 林伟 石永红 王清晨 褚杨 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所岩石圈演化国家重点实验室北京 100029；2.中国科学院研究生院北京 100049； 3.合肥工业大学资源与环境工程学院 合肥 230009 |
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| 基金项目： | 国家重点基础研究发展计划项目子课题，* |
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| 摘 要： | 大别山中部混合岩-片麻岩穹隆的构造属性认识方面一直众说纷纭.通过对中大别杂岩及其边界剪切带或断裂带的构造解析,并结合对前人相关研究的总结,我们将中大别杂岩厘定为早白垩世的变质核杂岩,其中商麻断裂与晓天-磨子潭断裂和水吼-五河剪切带构成了一个完整的拆离断层带,并将变质核杂岩的形成时间限定在145～120 Ma.中大别杂岩...
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| 关 键 词： | 大别山 变质核杂岩 伸展构造 超高压变质作用 华北克拉通破坏 |
| 收稿时间： | 2010-10-26 |
| 修稿时间： | 2010-11-25 |
Structure and evolution of the Early Cretaceous Dabieshan metamorphic core complex |
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| Ji Wenbin,Lin Wei,Shi Yonghong,Wang Qingchen,Chu Yang.Structure and evolution of the Early Cretaceous Dabieshan metamorphic core complex[J].Chinese Journal of Geology,2011,46(1):161-180. |
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| Authors: | Ji Wenbin Lin Wei Shi Yonghong Wang Qingchen Chu Yang |
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| Institution: | 1.State Key Laboratory of Lithospheric Evolution, institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029;2.Graduate University of Chinese Academy of Sciences,Beijing 100049;3.School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009 |
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| Abstract: | The nature of the extension dome in the Central Dabieshan Domain remains in debates for a long history.Based on the structural analysis of the core complex as well as its boundary shear zones or fracture zones and associated with a comprehensive review of the relative studies，we define this migmatite gneiss dome as a metamorphic core complex(MCC)developed during 145～120 Ma.The Shangma fault，Xiaotian Mozitan fault and Shuihou Wuhe shear zone constitute the detachment faults of the Dabieshan MCC.The ductile deformation of the core complex and the detachment faults with the same kinematics of top to NW shearing indicates that they initiated as a uniform，flat lying shear zone，possibly corresponding to the decoupled suface between the exhumated HP UHP slabs and middle lower crust.The Early Cretaceous migmatization and magmatism in Dabieshan was manifestations of the same tectonic thermal event，the formation of the orogen scale MCC intensively reconstructed the Early Mesozoic tectonic framework.Comparing with the extension tectonics in the east China，we propose that the occurrence of the Dabieshan MCC was the combined effects of three different geological processes in different levels：the gravitational collapse and delamination of the orogenic root，the ductile flow of the middle lower crust towards SE and the detachment and unroofing of the hanging wall，which shares the same tectonic settings as the destruction of the North China Craton under the Late Mesozoic regional extension in the east China. |
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| Keywords: | Dabieshan Extensional tectonics Metamorphic core complex UHP metamorphism The destruction of the North China Craton |
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