http://www.sciencedirect.com/science/article/pii/S1674987111001010 |
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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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