Water partitioning at 660 km depth and evidence for very low water solubility in magnesium silicate perovskite

Details Water partitioning at 660 km depth and evidence for very low water solubility in magnesium silicate perovskite Water partitioning at 660 km depth and evidence for very low water solubility in magnesium silicate perovskite

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30qsde3b&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 17, pp. SDE 3-1, CiteID 1905, DOI 10.1029/2003GL017182

Physics

15

Mineralogy And Petrology: Crystal Chemistry, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: Defects, Mineral Physics: Optical, Infrared, And Raman Spectroscopy, Tectonophysics: Rheology-Mantle

Scientific paper

Water partitioning experiments were performed in MgO +/- FeO +/- Al2O3-SiO2-H2O systems at 24 GPa and 1400°C and 1750°C in the multi-anvil press. In high-temperature experiments, water was not detected in near-infrared spectra of perovskite. In samples synthesized at 1400°C, in Al-free systems, (Mg,Fe)SiO3 perovskite coexisting with hydrous ringwoodite contained 1-2 ppm wt H2O. The partition coefficient Dringwoodite/perovskite of water between perovskite and ringwoodite varies between ~1050 and 1400. In the presence of aluminium at 1400°C, perovskite coexisted with superhydrous phase B. Raman analysis of the samples reveals the presence of superhydrous phase B and brucite as small inclusions in the perovskite, explaining the peaks near 3690, 3410 and 3350 cm-1, frequently seen in the infrared spectra of aluminous perovskites, but which are absent in perfectly clear regions. Consequently, the water solubility in aluminous perovskite appears to be very low. The partition coefficient Dmagnesiowüstite/perovskite varies between 60 and 75 in Fe- and Al-bearing systems, respectively.

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