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Fe (super 2+) -Ti (super 4+) charge-transfer in a garnets from mantle eclogites

Alexej N. Platonov, Klaus Langer, Stanislas S. Matsuk, Mikhail N. Taran and Yiaorui Hu
Fe (super 2+) -Ti (super 4+) charge-transfer in a garnets from mantle eclogites
European Journal of Mineralogy (February 1991) 3 (1): 19-26


A broad band centred at 23500 cm (super -1) , with a half band width of 7000 cm (super -1) is observed in the optical absorption spectra of yellow to orange pyrope-almandine-grossular garnets from mantle-derived kyanite-eclogites or inclusions in diamonds from such rocks. This band is assigned to Fe (super 2+) -Ti (super 4+) charge-transfer on the basis of its large half band width and the strong correlation with Fe (super 2+) -Ti (super 4+) concentration product, alpha (sub 23500) = -1235 + 901.78 . (X (sub Fe2+) -X (sub Ti4+) ), with correlation coefficient r = 0.978 (X = no. of atoms per formula unit). The electronic transition involves edge sharing, Fe (super 2+) -centred triangular dodecahedra and Ti (super 4+) -centred octahedra of the garnet structure.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 3
Serial Issue: 1
Title: Fe (super 2+) -Ti (super 4+) charge-transfer in a garnets from mantle eclogites
Affiliation: Acad. Sci. Ukrainian SSR, Inst. Geochem. Phys. Mineral., Kiev, Ukraine
Pages: 19-26
Published: 199102
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 1 p.
Accession Number: 1994-052607
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, 12 anals.
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 199424
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