| 印度与欧亚板块俯冲—碰撞过程岩石圈热结构模拟 |
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| 引用本文： | 江万.印度与欧亚板块俯冲—碰撞过程岩石圈热结构模拟[J].地球学报,2002,23(4):301-304. |
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| 作者姓名： | 江万 |
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| 作者单位： | 中国地质科学院地质力学研究所，北京，100081 |
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| 基金项目： | 自然科学青年基金(49902006)，中国地质调查局地调项目(DKD2001005) |
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| 摘 要： | 研究中采用了非线性非稳态的二维热传导－平流方程，首次考虑了俯冲角度及地球物质材料的性质对摩擦生热率的影响，对拉萨地块中部100－40Ma期间印度与欧亚板块俯冲－碰撞过程岩石热结构演化过程数值模拟进行了尝试，在模拟板块俯冲－碰撞过程中高原中部热结构的同时探讨了岩石圈的拆层作用对高原（尤其是对拉萨地块）热结构的影响。模拟结果显示，在俯冲阶段岩石圈热结构能较好地解释冈底斯花岗岩带中花岗闪长岩及其中铁镁质微粒包体存在壳幔二元体系这一认识。
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| 关 键 词： | 热结构 数值模拟 青藏高原 俯冲碰撞过程 |
Lithospheric Thermotectonic Simulation on the Indian-Eurasian Subduction and Collision |
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| JIANG Wan.Lithospheric Thermotectonic Simulation on the Indian-Eurasian Subduction and Collision[J].Acta Geoscientia Sinica,2002,23(4):301-304. |
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| Authors: | JIANG Wan |
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| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081 |
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| Abstract: | In this paper, the authors dealt tentatively with the lithospheric thermotectonic evolution via a numerical analysis of the middle part of Lhasa block from 100 Ma to 40 Ma, and used non linear unsteady advective heat transfer fracture to calculate the thermal sequences of two geological blocks, namely Lhasa block and Ocean plate. During this work, the effects of the subduction angle and the earth material on the production of the friction heat were considered for the first time. An 'upwind' finite element method was employed to simulate the thermotectonics, the calculated results were compared with the observations, and some discussions were made on the possibility and effect of delamination that occurred after collision. The subduction period thermotectonics agree well with the existence of the crust mantle system in granodiorite and its mafic microgranular enclaves from Gangdise batholith. |
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| Keywords: | thermotectonics numerical simulation Tibetan plateau subduction and collision |
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