Crustal melting beneath orogenic plateaus: Insights from 3-D thermo-mechanical modeling
文献类型：期刊论文
| 作者 | Chen, Lin1; Song, Xiaodong2; Gerya, Taras, V3; Xu, Tao1,4; Chen, Yun1 |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2019-06-20 |
| 卷号 | 761页码:1-15 |
| 关键词 | Numerical modeling Continental collision Crustal melting Radioactive heating Shear heating Tibetan plateau |
| ISSN号 | 0040-1951 |
| DOI | 10.1016/j.tecto.2019.03.014 |
| 英文摘要 | Mid-crustal melting is widely documented under orogenic plateaus. However, the mechanism for its generation and its role in the evolution of orogenic plateaus remain poorly understood. Here we investigate the physical controls and consequences of crustal melting in plateau evolution using 3-D thermo-mechanical modeling method. Our simulations demonstrate that the convergence causes orogenic crust to have more upper crustal compositions and more radiogenic elements. The persistent radioactive and shear heating provides heat source required for in situ partial melting of felsic rocks at mid-crustal depths. Slower convergence rate favors earlier emergence and larger concentration of mid-crustal melt. Radioactive heating accumulated during crustal thickening plays the primary role in generating mid-crustal partial melting, which is consistent with previous 2-D model results. Shear heating promotes crustal melting, but its role is secondary to radioactive heating. Our simulations also show that basal heating produces a broad-area increase of the crust temperature and surface elevation and, to a lesser extent, promotes mid-crustal melting, because convergence-driven heat advection dominates the transport of the newly-added heat. The significant mid-crustal melting dramatically reduces the viscosity of the middle crust and eventually leads to channelized outward flow of the melt-weakened layer. This has the potential to cause mechanical decoupling of the layers above and below the melt channel and the marginal dominance of mid-crustal melting. We suggest that the widespread low velocity or resistivity zones observed in Tibet are caused by interconnected mid-crustal melting, which is an inherent feature of large hot orogenic plateaus. |
| WOS关键词 | TIBETAN PLATEAU ; CONTINENTAL-CRUST ; CHANNEL FLOW ; COLLISIONAL OROGENS ; TECTONIC EVOLUTION ; DEFORMATION ; CONSEQUENCES ; RHEOLOGY ; DELAMINATION ; EXTRUSION |
| 资助项目 | Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000] ; National Key Research and Development of China[2016YFC0600406] ; National Natural Science Foundation of China[41888101] ; National Natural Science Foundation of China[41474084] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000470941500001 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | 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 Research and Development of China ; National Key Research and Development of China ; National Key Research and Development of China ; National Key Research and Development 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 Research and Development of China ; National Key Research and Development of China ; National Key Research and Development of China ; National Key Research and Development 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 Research and Development of China ; National Key Research and Development of China ; National Key Research and Development of China ; National Key Research and Development 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 Research and Development of China ; National Key Research and Development of China ; National Key Research and Development of China ; National Key Research and Development 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/92525]  |
| 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.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Illinois, Dept Geol, Urbana, IL 61801 USA 3.Swiss Fed Inst Technol, Inst Geophys, CH-8092 Zurich, Switzerland 4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Lin,Song, Xiaodong,Gerya, Taras, V,et al. Crustal melting beneath orogenic plateaus: Insights from 3-D thermo-mechanical modeling[J]. TECTONOPHYSICS,2019,761:1-15. |
| APA | Chen, Lin,Song, Xiaodong,Gerya, Taras, V,Xu, Tao,&Chen, Yun.(2019).Crustal melting beneath orogenic plateaus: Insights from 3-D thermo-mechanical modeling.TECTONOPHYSICS,761,1-15. |
| MLA | Chen, Lin,et al."Crustal melting beneath orogenic plateaus: Insights from 3-D thermo-mechanical modeling".TECTONOPHYSICS 761(2019):1-15. |
入库方式： OAI收割
来源：地质与地球物理研究所
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