The Role of Pre-existing Crustal Weaknesses in the Uplift of the Eastern Tibetan Plateau: 2D Thermo-Mechanical Modeling
文献类型：期刊论文
| 作者 | Xie, Renxian2,3; Chen, Lin4; Xiong, Xiong5; Wang, Kai2; Yan, Zhiyong1,6 |
| 刊名 | TECTONICS
 |
| 出版日期 | 2021-04-01 |
| 卷号 | 40期号:4页码:21 |
| ISSN号 | 0278-7407 |
| 关键词 | crustal melting pre‐ existing weaknesses thermo‐ mechanical modeling Tibetan Plateau |
| DOI | 10.1029/2020TC006444 |
| 英文摘要 | The crust of the eastern Tibetan Plateau is cut through by several ancient fracture zones, which existed prior to the Cenozoic uplift of eastern Tibet. However, the role of these pre-existing crustal weak zones (CWZs) in the Cenozoic evolution of eastern Tibet is still poorly understood. Here, we conduct a series of 2D thermo-mechanical simulations to investigate the role of CWZs in the uplift of eastern Tibet. Our results show that CWZs embedded in the continental lithosphere facilitate crustal thickening via folding and thrusting deformation and uplift of a rugged surface at the early stage of convergence. As crustal thickening continues, the lowermost crust begins to partially melt due to strain and radioactive heating. With continued thickening and heating, melt volume gradually increases, leading to the lower crust melt preferentially accumulating where the CWZs are situated. At a later stage, the partially molten layer becomes thick enough and starts to flow in a channel with respect to its upper and lower solid layers. CWZs behave as windows to steer the ascension of the partial melts, leading to melt doming through the CWZs. The melt doming contributes to a second local surface uplift. Parameter tests demonstrate that increasing the number of CWZs can accelerate such geodynamical processes, and that the CWZ orientation controls the polarity of lithospheric underthrusting. We suggest that the Cenozoic episodic uplift of the eastern Tibetan Plateau, revealed by thermochronological studies, was likely caused by a combination of pure shear crustal thickening and melt doming along the pre-existing CWZs. |
| WOS关键词 | LONGMEN SHAN ; TECTONIC EVOLUTION ; BENEATH EASTERN ; GEOCHRONOLOGICAL CONSTRAINTS ; COLLISIONAL OROGENS ; YIDUN ARC ; DEFORMATION ; MARGIN ; FLOW ; RHEOLOGY |
| 资助项目 | National Key R&D Program of China[2017YFC1500305] ; National Natural Science Foundation of China[41731072] ; National Natural Science Foundation of China[91955311] ; National Natural Science Foundation of China[41974110] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000643942000025 |
| 资助机构 | National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101187]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Chen, Lin |
| 作者单位 | 1.Huazhong Univ Sci & Technol, Inst Geophys, Wuhan, Peoples R China 2.Chinese Acad Sci, State Key Lab Geodesy & Earths Dynam, Innovat Acad Precis Measurement Sci & Technol, Wuhan, Peoples R China 3.Univ Chinese Acad Sci, Chinese Acad Sci, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 5.China Univ Geosci, Inst Geophys & Geomat, Wuhan, Peoples R China 6.Huazhong Univ Sci & Technol, PGMF, Wuhan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xie, Renxian,Chen, Lin,Xiong, Xiong,et al. The Role of Pre-existing Crustal Weaknesses in the Uplift of the Eastern Tibetan Plateau: 2D Thermo-Mechanical Modeling[J]. TECTONICS,2021,40(4):21. |
| APA | Xie, Renxian,Chen, Lin,Xiong, Xiong,Wang, Kai,&Yan, Zhiyong.(2021).The Role of Pre-existing Crustal Weaknesses in the Uplift of the Eastern Tibetan Plateau: 2D Thermo-Mechanical Modeling.TECTONICS,40(4),21. |
| MLA | Xie, Renxian,et al."The Role of Pre-existing Crustal Weaknesses in the Uplift of the Eastern Tibetan Plateau: 2D Thermo-Mechanical Modeling".TECTONICS 40.4(2021):21. |
入库方式： OAI收割
来源：地质与地球物理研究所
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