| Mesozoic thrusts and extensional structures in the Daqingshan orogen, Inner Mongolia, and their temporal and spatial relationship |
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| 作者姓名： | QI Guowei ZHANG Jinjiang WANG Xinshe GUO Lei |
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| 作者单位： | 1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, China； School of Earth and Space Sciences, Peking University, Beijing 100871, China； 2. Institute of Geology， Chinese Academy of Geological Sciences, Beijing 100037, China |
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| 基金项目： | Supported by the Special Project of the National Best Ph. D. Dissertations in College and University (200022)，National Natural Science Foundation of China (Grant No. 40572115) |
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| 摘 要： | Three large-scale thrusts developed in the Daqingshan orogen, Inner Mongolia, with a northeast-east trending from Louhuashan to Suletu are described in this paper. These northwest-directed thrusts, together with the four tectonic belts (or tectonic sheets) separated by these faults, formed a typical thrusting system. The originally defined Hohhot metamorphic core complex may be a tectonic sheet, making the uppermost tectonic unit of the thrusting system and truncated by the Daqingshan detachment fault on top. The existing tectono-chronological studies showed that the thrusting of this region possibly happened at the same time as the extension along the top detachment fault. This presents that the contraction and extension in Daqingshan orogen were probably simultaneous. The structural pattern of the Daqingshan orogen can be correlated to the Himalayan orogen, and models for simultaneous thrusting and detachment in Himalaya may give a hint for explaining the development of the Daqingshan orogen.
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| 关 键 词： | Daqingshan thrust metamorphic core complex detachment fault contraction-extension transform Himalaya. |
Mesozoic thrusts and extensional structures in the Daqingshan orogen, Inner Mongolia, and their temporal and spatial relationship |
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| Authors: | QI Guowei ZHANG Jinjiang WANG Xinshe GUO Lei |
| |
| Abstract: | Three large-scale thrusts developed in the Daqingshan orogen, Inner Mongolia, with a northeast-east trending from Louhuashan to Suletu are described in this paper. These northwest-directed thrusts, together with the four tectonic belts (or tectonic sheets) separated by these faults, formed a typical thrusting system. The originally defined Hohhot metamorphic core complex may be a tectonic sheet, making the uppermost tectonic unit of the thrusting system and truncated by the Daqingshan detachment fault on top. The existing tectono-chronological studies showed that the thrusting of this region possibly happened at the same time as the extension along the top detachment fault. This presents that the contraction and extension in Daqingshan orogen were probably simultaneous. The structural pattern of the Daqingshan orogen can be correlated to the Himalayan orogen, and models for simultaneous thrusting and detachment in Himalaya may give a hint for explaining the development of the Daqingshan orogen. |
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| Keywords: | Daqingshan thrust metamorphic core complex detachment fault contraction-extension transform Himalaya |
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