| 全球地幔三维结构模型及动力学研究新进展 |
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| 引用本文： | 朱介寿.全球地幔三维结构模型及动力学研究新进展[J].地球科学进展,1996,11(5):421-431. |
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| 作者姓名： | 朱介寿 |
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| 作者单位： | 成都理工学院 |
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| 摘 要： | 介绍了地幔三维地震模型及地球动力学最新进展，特别是１９９５年７月ＩＵＧＧ第２１届大会展示的新成果。地幔三维速度分布主要由全球数字地震台网资料求得。１００ｋｍ深度速度分布主要与板块构造有关，３５０ｋｍ深度显示了大陆与海洋的差异，１９００ｋｍ深度表现环太平洋的高速异常带。
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| 关 键 词： | 地幔 地震模型 地幔柱 动力学 地幔结构 |
THE RECENT DEVELOPMENT OF THREE-DIMENSIONAL MODELS AND GEODYNAMICS OF THE EARTH'S MANTLE |
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| Zhu Jieshou.THE RECENT DEVELOPMENT OF THREE-DIMENSIONAL MODELS AND GEODYNAMICS OF THE EARTH''''S MANTLE[J].Advance in Earth Sciences,1996,11(5):421-431. |
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| Authors: | Zhu Jieshou |
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| Institution: | Chengdu Institute of Technology,Chengdu 610059 |
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| Abstract: | Accurate models of the distribution of the elastic properties and density in the Earth's mantle are important in wide areas of geophysics,geochemistry,and astronomy.The purpose of this paper is to describe the recent three-dimensional seismic model and geodynamics of the Earth's mantle,especially been presented in IUGG XXI Assembly in Boulder,Colorado,USA in July 1995.The three-dimensional seismic models are constructed mainly by the data of broadband digital seismic networks.The velocity anomalies at different depths in mantle are characterized as follows.At a depth of 100km they follow the plate tectonic signature at surface.At a depth of 350km the principal expression of lateral variations are the differences between the continents and oceans.A ring of high velocities surrounding the Pacific basin.The topography on three internal mantle discontinuities(410km,660km,Core-Mantle Boundary)is shown.Two super-upwelling of mantle flow appear in south Pacific and west Africa in the lower mantle.The super downwelling plume underneath Asia is the dominant pattern of vertical mantle flow in the modern Earth.The mantle convection patterns in the upper mantle tend to be strongly controlled by the upwelling and downwelling superplumes in the lower mantle.The central Asia,from Indian subcontinent to Tibet,Xijiang,Mongolia and Baikal regions tend to be swallowed into the cold superplume forming the present largest collision and amalgamation places in the world. |
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| Keywords: | Three-dimensional seismic model of Earth's mantle Topography on three internal mantle discontinuities Super-plumes in the mantle and geodynamics |
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