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

Ohtani Eiji | Zendy; Mizobata Hiroki | Zendy; Kudoh Yasuhiro | Zendy; Nagase Toshiro | Zendy; Arashi Haruo | Zendy; Yurimoto Hisayoshi | Zendy; Miyagi Isoji | Zendy

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

Author(s) -

Ohtani Eiji,

Mizobata Hiroki,

Kudoh Yasuhiro,

Nagase Toshiro,

Arashi Haruo,

Yurimoto Hisayoshi,

Miyagi Isoji

Publication year - 1997

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/97gl00874

Subject(s) - silicate , periclase , mantle (geology) , geology , mineralogy , formula unit , phase (matter) , stishovite , analytical chemistry (journal) , chemical composition , geochemistry , chemistry , crystallography , quartz , crystal structure , environmental chemistry , paleontology , organic chemistry , spinel

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 Mg 1.14 Si 1.73 H 2.81 O 6 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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