Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Axial thermal expansion and related thermophysical parameters in the Mg,Fe olivine solid-solution series

Herbert Kroll, Armin Kirfel and Rolf Heinemann
Axial thermal expansion and related thermophysical parameters in the Mg,Fe olivine solid-solution series
European Journal of Mineralogy (October 2014) 26 (5): 607-621

Abstract

The successful parameterization of the volume thermal expansion in the Mg,Fe olivine solid-solution series stimulated us to carry the analysis further in view of the orthorhombic symmetry of the olivines and thus augment the available thermophysical data. To this purpose we studied the three axial expansivities, alpha (sub a,b,c) , on the basis of the same body of data and the same model as used for our parameterization of the volume expansion. The results are applied to various thermophysical parameters that possess a significant dependence on alpha (sub a,b,c) . In particular, the temperature variations of the axial adiabatic and isothermal moduli (a), the axial thermodynamic Gruneisen parameters (b), and the axial isothermal Anderson-Gruneisen parameters (c) are obtained for both forsterite (Fo) and fayalite (Fa). This allowed us to also study the response of alpha (sub a,b,c) axial expansivities to pressure. Since Fo and Fa are isomorphous, it is striking that the axial thermophysical properties of Fo are distinctly less anisotropic than those of Fa. Whereas in Fo, both the axial compressibilities and the axial expansivities follow the same sequence, i.e. beta (sub T,b) > beta (sub T,c) > beta (sub T,a) and alpha (sub b) > alpha (sub c) > alpha (sub a) , respectively, this expectation is violated in Fa where alpha (sub c) > alpha (sub a) > alpha (sub b) above 400 K. It is shown that the different anisotropies of the expansivities and hence of the alpha -dependent thermophysical properties can be related to differing structural responses to heating.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 26
Serial Issue: 5
Title: Axial thermal expansion and related thermophysical parameters in the Mg,Fe olivine solid-solution series
Affiliation: Westfaelische Wilhelms-Universitaet, Institut fuer Mineralogie, Munster, Germany
Pages: 607-621
Published: 201410
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 48
Accession Number: 2014-085356
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Steinmann Institut, DEU, Germany
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: 201444
Close Modal

or Create an Account

Close Modal
Close Modal