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The influence of Al (sub 2) O (sub 3) on the H (sub 2) O content in periclase and ferropericlase at 25 GPa

K. D. Litasov
The influence of Al (sub 2) O (sub 3) on the H (sub 2) O content in periclase and ferropericlase at 25 GPa
Russian Geology and Geophysics (June 2010) 51 (6): 644-649

Abstract

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 degrees C. The IR spectra of their crystals show narrow absorption peaks at 3299, 3308, and 3474 cm (super -1) . The calculated H (sub 2) O contents are 11-25 ppm in periclase (Al (sub 2) O (sub 3) = 0.9-1.2 wt.%) and 14-79 ppm in ferropericlase (Al (sub 2) O (sub 3) = 0.9-2.9 wt.%). Ferropericlase contains more H (sub 2) O and Al (sub 2) O (sub 3) than periclase at 1800-2000 degrees C. I suggest that addition of Al (sub 2) O (sub 3) does not influence the solubility of water in ferropericlase but can favor the additional incorporation of Fe (sub 2) O (sub 3) into the structure. The incorporation of Fe (super 3+) into ferropericlase increases water solubility as a result of iron reduction to Fe (super 2+) . 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.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 51
Serial Issue: 6
Title: The influence of Al (sub 2) O (sub 3) on the H (sub 2) O content in periclase and ferropericlase at 25 GPa
Author(s): Litasov, K. D.
Affiliation: Russian Academy of Sciences, Siberian Branch, V. S. Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 644-649
Published: 201006
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 42
Accession Number: 2021-071738
Categories: Mineralogy of non-silicatesIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202123
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