INTERACTION OF CHEMICALLY STRATIFIED SUBDUCTED OCEANIC LITHOSPHERE WITH THE 660 KM DISCONTINUITY

被引：4
|
作者：
KARATO, S
机构：
[1] Department of Geology and Geophysics, University of Minnesota., Minneapolis
来源：
PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES | 1995年 / 71卷 / 07期
关键词：
TRANSITION ZONE; SUBDUCTED OCEANIC LITHOSPHERE; GARNET; 660 KM DISCONTINUITY;
D O I：
10.2183/pjab.71.203
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：
Subducted oceanic lithosphere is composed of two chemically distinct layers, namely basaltic (crustal) and peridotitic (mantle) layers. Recent mineral physics observations suggest that the crustal and mantle components of subducted oceanic lithosphere have distinct densities and viscosities. The deformation of such stratified oceanic lithosphere as it collides with the 660 km discontinuity is examined using a simple analytical model. It is shown that the separation of the crustal component can occur through a small scale folding (10-20 km) if the viscosity of the crustal (garnetite) layer is significantly higher than that of the surrounding mantle (similar to 10(21) Pa s) but is less than similar to 10(23) Pa s, leading to a garnet-enriched transition zone behind subduction zones.
引用
收藏
页码：203 / 207
页数：5
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