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Ohtani et al. 1997

Ohtani, E., Mizobata, H., Kudoh, Y., Nagase, T., Arashi, H., Yurimoto, H. and Miyagi, I. (1997). A new hydrous silicate, a water reservoir, in the upper part of the lower mantle. Geophysical Research Letters 24: doi: 10.1029/97GL00874. issn: 0094-8276.

We synthesized a new hydrous silicate in the pressure range from 20 GPa to 24 GPa at 800--1300 ¿C. This phase, named tentatively as phase G, has a hexagonal unit cell, a=4.790(3) ¿ and c=4.344(3) ¿, and V=86.3(2) ¿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 3.37 g/cm3. 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.¿ 1997 American Geophysical Union

BACKGROUND DATA FILES

	Abstract

Keywords
Geochemistry, Composition of the core, Geochemistry, Composition of the mantle

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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