Relationship between the Altyn Tagh strike-slip fault and the Qaidam Basin：New insights from superposed buckle folding in Hongsanhan |
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| Authors: | Wei Du Daowei Zhang Xiangjiang Yu Xiang Cheng Zhendong Wang Qing Bian |
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| Institution: | 1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University , Beijing, China;2. Department of Natural Resources of Guizhou Province, Guiyang, Guizhou Research Institute of Petroleum Exploration &3. Development , Guizhou, China;4. Qinghai Oilfield Company, PetroChina , Dunhuang, Gansu, China;5. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University , Beijing, China |
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| Abstract: | ABSTRACT The relationship between the sinistral strike-slip Altyn Tagh Fault (ATF) and the internal tectonic deformation of the Qaidam Basin remains a controversial issue. Uncovering the relationship between the structures along the southern slope of the ATF is a viable solution to this problem. The ‘snake-like’ Hongsanhan superposed fold is located on the southern slope of the ATF. The Hongsanhan structure is controlled by the superposition of two generations of folds. The first-generation NW–SE-trending f1 fold, which developed during the Oligocene, constitutes the principal component of the present-day Hongsanhan fold, while the second-generation NE–SW-trending f2 folds formed during the middle Miocene. The structure of the Hongsanhan superposed fold proves that the large-scale sinistral strike-slip movements along the ATF began during the Oligocene. In addition, a flower structure associated with the ATF continuously extends into the Qaidam Basin. |
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| Keywords: | Cenozoic tectonic Altyn Tagh Fault Qaidam Basin superposed fold Hongsanhan fold |
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