Инд. авторы:	Litasov K.D.
Заглавие:	The influence of Al2O3 on the H2O content in periclase and ferropericlase at 25 GPa
Библ. ссылка:	Litasov K.D. The influence of Al2O3 on the H2O content in periclase and ferropericlase at 25 GPa // Russian Geology and Geophysics. - 2010. - Vol.51. - Iss. 6. - P.644-649. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2010.05.005; SCOPUS: 2-s2.0-77952960073;
Реферат:	eng: In this paper I present results of IR spectroscopic measurements of water solubility in Al-bearing periclase and ferropericlase (Mg# = 88) synthesized at 25 GPa and 1400-2000 °C. The IR spectra of their crystals show narrow absorption peaks at 3299, 3308, and 3474 cm-1. The calculated H2O contents are 11-25 ppm in periclase (Al2O3 = 0.9-1.2 wt.%) and 14-79 ppm in ferropericlase (Al2O3 = 0.9-2.9 wt.%). Ferropericlase contains more H2O and Al2O3 than periclase at 1800-2000 °C. I suggest that addition of Al2O3 does not influence the solubility of water in ferropericlase but can favor the additional incorporation of Fe2O3 into the structure. The incorporation of Fe3+ into ferropericlase increases water solubility as a result of iron reduction to Fe2+. It is shown that water has limited solubility in ferropericlase from mantle peridotite; therefore, ferropericlase cannot be considered an important hydrogen-bearing mineral in the lower mantle. © 2010.
Ключевые слова:	pressure; water; solubility; periclase; mineral synthesis; lower mantle; infrared spectroscopy; aluminum compound; water; periclase; lower mantle; IR spectroscopy; peridotite; ferropericlase;
Издано:	2010
Физ. характеристика:	с.644-649