TY - JOUR
T1 - Stability of hydrous phase H MgSiO4H2 under lower mantle conditions
AU - Ohtani, Eiji
AU - Amaike, Yohei
AU - Kamada, Seiji
AU - Sakamaki, Tatsuya
AU - Hirao, Naohisa
N1 - Publisher Copyright:
© 2014. American Geophysical Union. All Rights Reserved.
PY - 2014/12/16
Y1 - 2014/12/16
N2 - We report the stability field of a new high-pressure hydrous phase, phase H MgSiO4H2, and its implications for water transport into the deep lower mantle. We observed the existence of hydrous phase H at pressures around 50 GPa, and this phase was stable up to 60 GPa. Our results, together with those of previous works, indicate that pure phase H MgSiO4H2 has a very narrow stability field in the pressure range 35 < P < 60 GPa, equivalent to the uppermost part of the lower mantle. The stability field expands significantly toward higher pressures and temperatures on dissolution of the hydrous AlOOH component. The hydrous phase H-phase δ solid solution (aluminous phase H), (MgSi,Al2)O4H2, is potentially the most important hydrous phase present under the deep lower mantle conditions.
AB - We report the stability field of a new high-pressure hydrous phase, phase H MgSiO4H2, and its implications for water transport into the deep lower mantle. We observed the existence of hydrous phase H at pressures around 50 GPa, and this phase was stable up to 60 GPa. Our results, together with those of previous works, indicate that pure phase H MgSiO4H2 has a very narrow stability field in the pressure range 35 < P < 60 GPa, equivalent to the uppermost part of the lower mantle. The stability field expands significantly toward higher pressures and temperatures on dissolution of the hydrous AlOOH component. The hydrous phase H-phase δ solid solution (aluminous phase H), (MgSi,Al2)O4H2, is potentially the most important hydrous phase present under the deep lower mantle conditions.
KW - DHMS
KW - hydrous phase H
KW - lower mantle
KW - stability field
KW - water
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U2 - 10.1002/2014GL061690
DO - 10.1002/2014GL061690
M3 - Article
AN - SCOPUS:84921541002
VL - 41
SP - 8283
EP - 8287
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 23
ER -