| Structural features and deformational ages of the northern Dabashan thrust belt |
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| 作者姓名： | Pengyuan Li Jinjiang Zhang Lei Guo Xiongying Yang |
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| 基金项目： | This research was financially supported by National Natural Science Foundation of China，major project of China Petrochemical Corporation (Sinopec Group) for fundamental research (Continental Tectonics，Prospects of Marine Origin Hydrocarbon Resource in The Middle-Upper Yangtze Region |
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| 摘 要： | A large-scale pop-up structure occurs at the front of the northern Dabashan thrust belt (NDTB),bound by the NNE-dipping Chengkou fault to the south,and the SSW-dipping Gaoqiao fault to the north.The pop-up structure shows different features along its strike as a direct reflection of the intensity of tectonic activity.To the northwest,the structure is characterized by a two-directional thrust system forming a positive flower-like structure.In contrast,the southeastern part is composed of the vertical Chengkou fault and a series of N-directed backthrusts.showing a semi-flower-like structure. We present results from Ar-Ar dating of syntectonic microthermal nietamorphic sericite which show that the Chengkou fault experienced intense deformation during the mid-Mesozoic Yanshanian epoch(about 143.3 Ma),causing rapid uplift and thrusting of the northern Dabashan thrust belt.During the propagation of this thrust,a series of backthrusts formed because of the obstruction from the frontier of Dabashan thrust belt,leading to the development of the pop-up structure.
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| 关 键 词： | Northern Dabashan Thrust belt Backthrust Tectonics Pop-up structure Ar-Ar geochronology |
| 收稿时间： | 31 May 2011 |
| 修稿时间： | 9/1/2011 12:00:00 AM |
http://www.sciencedirect.com/science/article/pii/S1674987111001010 |
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| Pengyuan Li,Jinjiang Zhang,Lei Guo,Xiongying Yang.Structural features and deformational ages of the northern Dabashan thrust belt[J].Geoscience Frontiers,2012,3(1):41-49. |
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| Authors: | Pengyuan Li Jinjiang Zhang Lei Guo Xiongying Yang |
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| Institution: | 1. The Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China
2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | A large-scale pop-up structure occurs at the front of the northern Dabashan thrust belt
(NDTB), bound by the NNE-dipping Chengkou fault to the south, and the SSW-dipping Gaoqiao fault
to the north. The pop-up structure shows different features along its strike as a direct reflection of the
intensity of tectonic activity. To the northwest, the structure is characterized by a two-directional thrust
system forming a positive flower-like structure. In contrast, the southeastern part is composed of the
vertical Chengkou fault and a series of N-directed backthrusts, showing a semi-flower-like structure.
We present results from Ar-Ar dating of syntectonic microthermal metamorphic sericite which show that
the Chengkou fault experienced intense deformation during the mid-Mesozoic Yanshanian epoch (about
143.3 Ma), causing rapid uplift and thrusting of the northern Dabashan thrust belt. During the propagation
of this thrust, a series of backthrusts formed because of the obstruction from the frontier of Dabashan
thrust belt, leading to the development of the pop-up structure. |
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| Keywords: | Northern Dabashan Thrust belt Backthrust Tectonics Pop-up structure Ar-Ar geochronology |
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