| 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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| 引用本文：贺赤诚,张岳桥,李建,李海龙,孙东霞,熊金红.2019.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[J].地球学报,40(4):563-587. |
| DOI：10.3975/cagsb.2018.111901 |
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| 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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| 中文摘要:马衔山断裂带地处青藏高原东北隅陇中盆地的腹地, 分隔了北部的兰州盆地和南部临夏盆地, 该断裂带的变形特征记录了该地区白垩纪—新生代时期的构造演化历史。本文通过对马衔山断裂带的运动学分析并结合区域地层序列, 建立了三阶段的变形历史。第一阶段近WNW–ESE向伸展作用控制了马衔山断陷盆地的伸展断陷和早白垩世河湖相沉积, 在晚白垩世晚期—古新世早期(~80–60 Ma)在NNW–SSE向挤压作用下, 断裂发生右旋走滑活动, 盆地挤压反转。该阶段的断层活动和盆地发育的板块动力主要来自亚洲大陆南部和东部陆缘新特提斯洋—古太平洋俯冲汇聚。第二阶段表征为古近纪(~60–23 Ma)构造挤压与走滑拉分盆地的发育, 晚古新世—晚始新世地层主要分布在西宁盆地、兰州盆地、马衔山东南段等区域, 在马衔山地区这期挤压应力方向为NNE向, 是印度—欧亚大陆碰撞的远程响应。第三阶段为中新世(~23 Ma–)时期。早期(~23–13 Ma)马衔山北缘断裂以正断层活动为主, 控制了断裂带东南段中新世红黏土沉积, 引张应力方向为NNW–SSE。中新世晚期(~13 Ma起)以来, 构造应力体制转变为ENE–WSW挤压, 其造成马衔山地区周缘山系的快速隆升。 |
| 中文关键词:马衔山断裂带 青藏高原东北隅 白垩纪—新生代 断层运动学 古构造应力场 |
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| Kinematics of the Maxian Mountain Fault, Northeastern Tibetan Plateau: The History of Cretaceous–Cenozoic Sedimentary and Tectonic Deformation |
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| Abstract: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. |
| keywords:Maxian Mountain fault zone northeastern Tibetan Plateau Cretaceous–Cenozoic fault kinematics paleostress field |
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