Cenozoic Deformation and Evolution of the Niushou Shan——Luo Shan Fault Zone in the Northeast Margin of the Tibetan Plateau
详细信息
- 责任者：Chen Hong (Key Laboratory of Paleomagnetism and Tectonic Reconstruction ; Ministry of Land and Resources ; Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100081 ; China) ; Hu Jianmin
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(4)
- 关键词：构造变形 ; tectonic deformation ; 构造演化 ; structural evolution ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.18-35
- 图表：illus., 1 table, 51 refs.
- 分类号：0300
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The Niushou Shan Luo Shan fault zone is located in the outer edge of the northeastern Tibet Plateau and separates the northeast margin of the Tibet Plateau from the Ordos block.The structural features of the main faults and regional tectonic analysis indicate that the Niushou Shan Luo Shan fault zone may have undergone four stages of paleo-stress field in the Cenozoic.Combined with the geochronological information,the Cenozoic tectonic evolution may be constrained as follows: N-S compression and thrust in the Late Eocene Oligocene,NW SE compression and sinistral strike-slip in the Late Miocene to the Pliocene,NNE SSW compression and dextral strike-slip in the Late Pliocene to the Middle Pleistocene,and E-W compression and extension since the Late Pleistocene.The intensive structural deformation of the fault zone commenced at the Late Miocene,implying that the margin of the Northeastern Tibet Plateau had extended to the Niushou Shan Luo Shan fault zone at the time.Our study indicates that the Cenozoic tectonic evolution of the Niushou Shan Luo Shan fault zone was closely related to the Indian Eurasian continental collision and the Tibet Plateau uplifting,recording the northeastward growth of the Tibet Plateau and the Cenozoic tectonic transition of the Ordos block.
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