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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
收藏
页码：506 / 511
页数：6
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