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Elasticity of tephroite (alpha -Mn (sub 2) SiO (sub 4) ) and a comparison of the elastic properties of silicate olivines

Chung-Cherng Lin and Chien-Chih Chen
Elasticity of tephroite (alpha -Mn (sub 2) SiO (sub 4) ) and a comparison of the elastic properties of silicate olivines
European Journal of Mineralogy (January 2011) 23 (1): 35-43

Abstract

The elastic constants of pure tephroite (alpha -Mn (sub 2) SiO (sub 4) ) have been determined by Brillouin spectroscopy. From measurements, the average aggregate bulk and shear moduli at ambient conditions are 129.8+ or -0.5 and 53.1+ or -0.4 GPa, respectively, which also confirm the reality of the unexpected high elastic moduli in tephroite. An analysis based on the present data and those in literature has revealed the relative orders: fayalite>tephroite> or =forsterite for bulk modulus and forsterite>>tephroite>fayalite for shear modulus. It also indicates that the propagation velocity of a sound wave inside forsterite will be considerably changed by dissolving a small amount of Mn (super 2+) and/or Fe (super 2+) (for shear wave) and Ni (super 2+) cations (for compressional wave). The causes for the significant difference between forsterite and the 3d silicate olivines and the unexpected elastic behavior in tephroite have been explored by considering the nature of both electron orbitals and MO (sub 6) octahedra.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 23
Serial Issue: 1
Title: Elasticity of tephroite (alpha -Mn (sub 2) SiO (sub 4) ) and a comparison of the elastic properties of silicate olivines
Affiliation: Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan
Pages: 35-43
Published: 201101
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 62
Accession Number: 2011-026556
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: National Central University, TWN, Taiwan
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201115
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