High-pressure transformation of pyrope (Mg3Al2Si3O12) in a sintered diamond cubic anvil assembly

被引：60

作者：

Ito, E ^{[1
]}

Kubo, A

Katsura, T

Akaogi, M

Fujita, T

机构：

[1] Okayama Univ, Inst Study Earths Interior, Tottori 6820192, Japan

[2] Gakushuin Univ, Dept Chem, Toshima Ku, Tokyo 1710031, Japan

来源：

GEOPHYSICAL RESEARCH LETTERS | 1998年 / 25卷 / 06期

关键词：

D O I：

10.1029/98GL00519

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Transformation of pyrope garnet was investigated at 1600 degrees C and at pressures higher than 35 GPa using a sintered diamond cubic anvil assembly in a double-staged split-sphere apparatus. Pyrope transformed into orthorhombic perovskite at ca. 37 GPa, whereas a small amount of corundum coexisted with perovskite at lower pressures. The unit cell dimensions of perovskite were determined to be a = 4.771(2) Angstrom, b = 4.947(2) Angstrom, c = 6.950(3) Angstrom and V = 164.0(2) Angstrom(3). A trace of stishovite observed in the run products may be evidence of nonstoichiometry in the perovskite. These results support the view that perovskite is the major host phase of Al2O3 in the lower mantle.

引用

页码：821 / 824

页数：4

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