下地幔及核幔边界结构及地球动力学

doi:10.11867/j.issn.1001-8166.2000.02.0139

地球科学进展 ›› 2000, Vol. 15 ›› Issue (2): 139 -142. doi: 10.11867/j.issn.1001-8166.2000.02.0139

下地幔及核幔边界结构及地球动力学

朱介寿

成都理工学院,四川成都 610059

收稿日期:1999-05-28 修回日期:1999-07-08 出版日期:2000-04-01
通讯作者: 朱介寿,男,1936年10月出生于江苏省,教授,主要从事地球内部物理学及应用地球物理学研究。
基金资助:
国家自然科学基金重点项目“中国及邻区地球内部各圈层三维结构及地球动力学”(编号:49734150)及国土资源部“九五”基础研究基金
项目联合资助。

STRUCTURE OF LOWER MANTLE AND CORE-MANTLE BOUNDARY REGION AND ITS GEODYNAMICS

ZHU Jieshou

Chengdu University of Technology,Chengdu 610059,China

Received:1999-05-28 Revised:1999-07-08 Online:2000-04-01 Published:2000-04-01

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新一代高分辨率下地幔及核幔边界的地震层析成像,改变了我们对全球构造模式及地球动力过程的认识。古海洋岩石圈板片一直俯冲到下地幔底部,其残留体在核幔边界积累,并支持了地幔整体对流模式。位于核幔边界上的D″层有着十分复杂而精细的结构。紧靠核幔边界的地幔一侧发现了超低速层(ULVZ),它们可能是D″层内的局部熔融物,是引起地表热点的上升地幔柱的源头。

关键词: 地震层析成像, 下地幔, 核幔边界, 地球动力学

The new generation of high-resolution seismic tomographic images of lower mantle and core-mantle boundary region have provided amazing insights for global tectonics and the dynamic processes of the Earth. The ancient oceanic lithospheric slabs sank into the bottom of the lower mantle, and the material of remnants slabs accumulated at the core-mantle boundary. The model of convective flow of the whole mantle was supported by the new seismic images. The D" discontinuity above the core-mantle boundary has a fine and complicated structure and interpreted as a chemical or phase transition zone, and add the possibility that the cold thermal anomaly associated ancient slabs leads to the velocity anomaly.One of the most exciting discovery is the ultralow velocity zone (ULVZ) which close the core-mantle boundary in lower mantle side, it may be the partial molten layer and the sources of the upwelling plume which cause the hot spots at the Earth' s surface.

Key words: Seismic tomography, Lower mantle, Core-mantle boundary, Geodynamics.

中图分类号:

P541

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