THERMAL AND CHEMICAL HETEROGENEITY IN THE MANTLE - A SEISMIC AND GEODYNAMIC STUDY OF CONTINENTAL ROOTS

被引：24

作者：

FORTE, AM ^{[1
]}

DZIEWONSKI, AM ^{[1
]}

OCONNELL, RJ ^{[1
]}

机构：

[1] HARVARD UNIV,DEPT EARTH & PLANETARY SCI,CAMBRIDGE,MA 02138

来源：

PHYSICS OF THE EARTH AND PLANETARY INTERIORS | 1995年 / 92卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0031-9201(95)03060-A

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Chemical differences in the mantle below continents and oceans are investigated in the context of a recent seismic model of three-dimensional mantle structure. This analysis of the existence and magnitude of deep continent-ocean chemical differences is based on a model of a viscous flowing mantle and it suggests that this continent-ocean heterogeneity is internally supported and thus produces little flow. This stabilization reduces the vertical flow of mass and heat across the upper mantle and results in a large continent-ocean signal in the surface gravity and topography fields. The stabilization of continent-ocean heterogeneity also provides an explanation for the large amplitude of the nonhydrostatic ellipticity in the Earth's geoid.

引用

页码：45 / 55

页数：11

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