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XANES study of titanium coordination in natural diopsidic pyroxenes

Simona Quartieri, Gianni Antonioli, Gilberto Artioli and Pier Paolo Lottici
XANES study of titanium coordination in natural diopsidic pyroxenes
European Journal of Mineralogy (December 1993) 5 (6): 1101-1109

Abstract

A series of five diopsidic pyroxenes previously reported to have Si and Al deficiency in the tetrahedral sites were used for an X-ray absorption near-edge study, the geometrical features being interpreted on the basis of Ti (super 4+) right arrow Si substitution. The XANES spectral features confirm that Ti (super 4+) preferentially enters the tetrahedral site in two of the diopsides in which Al (super 3+) is absent. In the other three pyroxenes, Ti (super 4+) appears to be distributed among the tetrahedral and octahedral sites. The Fe K-edge spectra of all five pyroxenes show no evidence of tetrahedrally coordinated iron; the prevalent iron oxidation state appears to be Fe (super 2+) .


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 5
Serial Issue: 6
Title: XANES study of titanium coordination in natural diopsidic pyroxenes
Affiliation: Universita di Modena, Dipartimento di Scienze della Terra, Modena, Italy
Pages: 1101-1109
Published: 199312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 31
Accession Number: 1994-001545
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 tables
Secondary Affiliation: Universita di Parma, ITA, ItalyUniversita di Milano, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199401
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