A new hydrous silicate, a water reservoir, in the upper part of the lower mantle

被引：52

作者：

Ohtani, E

Mizobata, H

Kudoh, Y

Nagase, T

Arashi, H

Yurimoto, H

Miyagi, I

机构：

[1] TOHOKU UNIV,DEPT MACHINE INTELLIGENCE & SYST ENGN,SENDAI,MIYAGI 980,JAPAN

[2] TOKYO INST TECHNOL,DEPT EARTH & PLANETARY SCI,TOKYO 152,JAPAN

[3] GEOL SURVEY JAPAN,TSUKUBA,IBARAKI 305,JAPAN

来源：

GEOPHYSICAL RESEARCH LETTERS | 1997年 / 24卷 / 09期

关键词：

D O I：

10.1029/97GL00874

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We synthesized a new hydrous silicate in the pressure range from 20 GPa to 24 GPa at 800-1300 degrees C. This phase, named tentatively as phase G, has a hexagonal unit cell, a=4.790(3)Angstrom and c=4.344(3)Angstrom, and V=86.3(2)Angstrom(3) and the atomic ratio Mg/Si=0.66+/-0.03. SIMS analysis revealed that it contains 14.5+/-2.0wt% water. Phase G has a chemical formula of Mg1.14Si1.73H2.81O6 and a density of 3.37g/cm(3). Phase G coexists with periclase and Mg-perovskite under the lower mantle conditions, and thus it can be a reservoir of water in cold slabs penetrating into the lower mantle.

引用

页码：1047 / 1050

页数：4

共 17 条

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