Pressure dependence of H solubility in magnesiowüstite up to 25 GPa: Implications for the storage of water in the Earth's lower mantle

Details Pressure dependence of H solubility in magnesiowüstite up to 25 GPa: Implications for the storage of water in the Earth's lower mantle Pressure dependence of H solubility in magnesiowüstite up to 25 GPa: Implications for the storage of water in the Earth's lower mantle

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j..89b&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 10, pp. 89-1, CiteID 1449, DOI 10.1029/2001GL014457

Physics

6

Mineral Physics: Defects, Mineralogy, Petrology, And Mineral Physics: Crystal Chemistry, Mineral Physics: Optical, Infrared, And Raman Spectroscopy, Tectonophysics: Rheology-Mantle, Geochemistry: Geochemical Cycles (0330)

Scientific paper

The solubility of hydrogen in (Mg0.93Fe0.07)O was studied from 5 to 25 GPa at 1200°C under oxidizing conditions, using FTIR spectroscopy on quenched single crystals. OH solubility increases with increasing pressure, concomitant with a decrease in ferric iron content. This result suggests that under lower mantle conditions, the charge neutrality condition could change from [FeMe.] = 2[V''Me] to [(OH)O.] = 2[V''Me], which would have important implications for the rheology of that region. The OH solubility data are well explained by incorporation of H as isolated hydroxyl groups via reduction of ferric iron. The amount of H incorporated at 25 GPa and 1200°C is ~100 H/106 Me (Me = Mg, Fe), i.e. ~20 ppm wt H2O, under water-saturated conditions. When integrated over the entire mass of the lower mantle, these 20 ppm wt H2O amount to about 7.3 × 1018 kg H2O, a storage capacity of ~0.5% of the ocean mass.

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