| 青藏高原东北隅马衔山断裂带及周缘白垩纪—新生代沉积和构造变形历史 |
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| 关键词:Maxian Mountain fault zone northeastern Tibetan Plateau Cretaceous–Cenozoic fault kinematics paleostress field |
| 基金项目:国家自然科学基金项目(编号: 41472178);中国地质调查局项目(编号: 12120114002201) |
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| 摘要点击次数: 2008 |
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| 摘要: |
| Kinematics of the Maxian Mountain Fault, Northeastern Tibetan Plateau: The History of Cretaceous–Cenozoic Sedimentary and Tectonic Deformation |
| Situated in the central Longzhong basin in northeast Tibetan Plateau, the Maxian Mountain fault zone separates the Lanzhou basin to the north and the Linxia basin to the south. The deformation of the fault zone records the Cretaceous to Cenozoic tectonic evolution of this area. Based on new structural measurements and fault kinematic analysis, together with regional depositional sequences, the authors established a three-stage deformation history. The first stage was featured by WNW–ESE extension resulting in the formation of Maxian Mountain faulted basin which was filled with Early-Cretaceous fluvial-lacustrine deposits; subsequent NNW–SSE compression by Late Cretaceous to Early Paleocene (~80–60 Ma) resulted in dextral-slip inversion of the basin. This tectonic phase might have possibly been a far-field effect associated with the subduction of Neo-Thethys and Paleo-Pacific oceanic plates along the south and the east margin of East Asia continent, respectively. The second stage during the Paleogene (~60–23 Ma) was dominated by NNE–SSW compression and the formation of strike-slip pull-apart basins, such as Xining basin, Lanzhou basin and Linxia Maxian Mountain. This tectonic phase recorded the far-field effect of India-Eurasia collision. The third stage in Early Miocene (~23–13 Ma) was dominated by normal-slip faulting along the Maxian Mountain fault zone, resulting from NNW–SSE extensional stress regime and controlling Miocene red clay deposits along its southeastern segment. Since Late Miocene (~13 Ma), the tectonic stress regime has changed into ENE–WSW compression which has had weakly influenced this area. |
| HE Chi-cheng,ZHANG Yue-qiao,LI Jian,LI Hai-long,SUN Dong-xia,XIONG Jin-hong.2019.Kinematics of the Maxian Mountain Fault, Northeastern Tibetan Plateau: The History of Cretaceous–Cenozoic Sedimentary and Tectonic Deformation[J].Acta Geoscientica Sinica,40(4):563-587. |
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