| 峨眉地幔柱动力学数值模拟的初步研究 |
| 点此下载全文 |
| 引用本文：李建康,王登红.2004.峨眉地幔柱动力学数值模拟的初步研究[J].地球学报,25(5):509-514. |
| DOI： |
| 摘要点击次数: 2459 |
| 全文下载次数: 2094 |
|
| 基金项目:国家重点基础发展规划“973”项目(G1999043203课题);国土资源部百名优秀青年科技人才计划项目;地质大调查项目(编号:200310200002和K1.4-3-4) |
|
| 中文摘要:在地幔柱的研究中 ,计算机数值模拟是一种常用的重要方法。地幔柱动力学定量模型主要由质量守恒方程、动量守恒方程和能量守恒方程组成 ,经计算模拟最终得到了温度场时空变化曲线。模拟结果表明 :①峨眉地幔柱上升到地壳大约需要 10 0× 10 6a,而后在短期内喷发 ;②地幔柱演化过程中上升阶段和壳幔相互作用阶段所消耗的时间最长 ;③证明了地幔柱的脉动性 ,地幔柱的物质和能量是以脉动的形式向上传输的 ,同时也提供了板块运移的动力 ;④物质的粘度对于地幔柱的形成和发展起着重要作用 ;⑤地幔柱对地壳的重熔作用持续时间很长 ,这为大规模矿床的形成提供了时间条件。 |
| 中文关键词:峨眉地幔柱 数值模拟 有限元 |
| |
| A Preliminary Research on the Numerical Simulation of the Emei Mantle Plume |
|
|
| Abstract:Numerical simulation is an important method in the study of mantle plume. The dynamical model developed in this paper consists of density and continuity equation, momentum equation and energy equation. With the finite element method, the model can be described by two equations depending on temperature and stream function. By means of Numerical Simulation, some important conclusions have been reached: ① The Emei mantle plume penetrated the mantle and migrated upward into the crust in a period of about 100×106 a, and then the main eruptiontook place in a short time; ② Inthe process of mantle plume evolution, the phase of upwelling and plume-lithosphere interaction lasteda long time; ③ The Emei mantle plume migrated upward in a way of pulzation. Thematerial and energy of the Emei mantle plume were transported by pulse, and thepulse caused the plate to move; ④ Viscosity played an important role in the process of mantle plume upwelling; ⑤ The melting of lithosphere and the eruption of continental flood basalts lasted a long time,which provided enough time for large scale mineralization. |
| keywords:Emei mantle plume numerical simulation finite element |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|
