EFFECT OF IRON CONTENT ON THE ELECTRICAL-CONDUCTIVITY OF PEROVSKITE AND MAGNESIOWUSTITE ASSEMBLAGES AT LOWER MANTLE CONDITIONS

被引：37

作者：

LI, XY ^{[1
]}

JEANLOZ, R ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY, DEPT GEOL & GEOPHYS, BERKELEY, CA 94720 USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS | 1991年 / 96卷 / B4期

关键词：

D O I：

10.1029/90JB02632

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We have measured the electrical conductivity of (Mg0.76Fe0.24)SiO3 perovskite and of an assemblage of (Mg0.89Fe0.11)SiO3 perovskite + (Mg0.70Fe0.30)O magnesiowustite at pressures of 45-80 GPa and temperatures from 295 to 3600 K. The apparent activation energy for electrical conduction is 0.24 (+/- 0.10) eV for the perovskite and 0.20 (+/- 0.08) eV for the perovskite + magnesiowustite assemblage. Comparing our present results with those derived previously for Fe-poor samples, we find that the electrical conductivities of both the silicate perovskite and the perovskite + magnesiowustite assemblage depend strongly on iron content. Thus the electrical conductivity distribution inside the Earth could provide an important constraint in modeling the composition of the lower mantle.

引用

页码：6113 / 6120

页数：8

共 31 条

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