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

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

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1047o&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 9, p. 1047-1050

Physics

18

Geochemistry: Composition Of The Core, Geochemistry: Composition Of The Mantle

Scientific paper

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)Å and c=4.344(3)Å, and V=86.3(2)Å3 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/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.

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