SEISMIC CONSTRAINTS ON MANTLE FLOW AND TOPOGRAPHY OF THE 660-KM DISCONTINUITY - EVIDENCE FOR WHOLE-MANTLE CONVECTION

被引：53

作者：

MORGAN, JP

SHEARER, PM

机构：

[1] Institute of Geophysics and Planetary Physics, University of California at San Diego, San Diego

来源：

NATURE | 1993年 / 365卷 / 6446期

关键词：

D O I：

10.1038/365506a0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Recent seismic models of three-dimensional mantle structure and topography on the transition-zone seismic discontinuities permit the direct evaluation of the buoyancy forces that drive large-scale mantle flow. This buoyancy distribution, coupled with radial viscosity models that are consistent with the observed geoid, predicts flow patterns with significant vertical flow through the 660-km phase boundary. The observed topography on the 660-km discontinuity acts to inhibit convection across the boundary, but is two to four times too small to prevent whole-mantle convection.

引用

页码：506 / 511

页数：6

共 39 条

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