| 大别-苏鲁超高压变质带P-T-t轨迹的动力学模拟 |
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| 引用本文： | 范桃园,石耀霖.大别-苏鲁超高压变质带P-T-t轨迹的动力学模拟[J].地球物理学报,2001,44(5):627-635. |
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| 作者姓名： | 范桃园 石耀霖 |
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| 作者单位： | 中国科学院中国科技大学研究生院,北京100039 |
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| 基金项目： | 国家自然科学基金项目 (4 97742 3 6) |
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| 摘 要： | 综合现有的地质、地球化学资料以及同位素年龄等研究成果，同时结合新西兰南岛北端陆壳俯冲的最新发现，提出了超高压变质岩的形成四阶段演化模式：板片俯冲形成增生楔、板片俯冲驱动角落流、板片拆离浮力抬升至Moho深度和后期上地壳伸展阶段.以此为定量模拟的出发点，利用二维有限元对大别-苏鲁超高压变质带的形成演化进行了动力学和热演化模拟，追踪超高压变质岩形成演化过程中的质点路径以及对应的P-T-t轨迹.计算的P-T-t轨迹及其空间分布特征均能与实测结果较好吻合.
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| 关 键 词： | 大别-苏鲁地区 超高压变质作用 P-T-t轨迹 有限元模拟 地球动力学 |
| 文章编号： | 0001-5733(2001)05-0627-09 |
| 收稿时间： | 2000-09-01 |
THERMO-DYNAMIC MODELING OF P-T-t PATHS OF DABIE—SULU ULTRA-HIGH PRESSURE METAMORPISM |
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| FAN TAO-YUAN SHI YAO-LIN.THERMO-DYNAMIC MODELING OF P-T-t PATHS OF DABIE—SULU ULTRA-HIGH PRESSURE METAMORPISM[J].Chinese Journal of Geophysics,2001,44(5):627-635. |
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| Authors: | FAN TAO-YUAN SHI YAO-LIN |
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| Institution: | Graduate School of University of Science and Technology of China, Beijing 100039,China |
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| Abstract: | HTBased on integrated study of geology, geochemistry, isotopic dating, and latest findings of continent subduction at northern South Island in New Zealand, we propose an evolution model on the ultra-high pressure metamorphic (UHPM) rocks. This model which includes four stages: plate subduction with wedge accretion, plate subduction with corner-flow driven by the slab, break-off of the slab and buoyant uplifting of the wedge to the normal Moho depth, and final exhumation with upper crust extension. Based on this model, we make 2-D finite element numerical modeling to simulate the dynamics and thermo-tectonics of UHPM belts of Dabie-Sulu, and trace trajectories of rocks at different locations and their corresponding P-T-t paths. The calculated P-T-t paths and the UHPM spatial distribution are in good agreement with the observations. HTH |
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| Keywords: | HTZK(Dabie-Sulu Ultra high pressure metamorphism (UHPM) P-T-t path Finite element modeling Geodynamics |
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