• journal_title：European Journal of Mineralogy
• Contributor：Herbert Kroll ; Armin Kirfel ; Rolf Heinemann ; Bruno Barbier
• Publisher：E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
• Date：2012-10-01
• Format：text/html
• Language：en
• Identifier：10.1127/0935-1221/2012/0024-2235
• journal_abbrev：Eur J Mineral
• issn：0935-1221
• volume：24
• issue：6
• firstpage：935
• section：Articles

The thermal expansion of the Mg,Fe olivine solid-solution series was investigated from a total of 316 V(T) data, 141 of which were collected in this work by single-crystal X-ray diffraction over a wide range of temperatures. Functional forms currently in use for modelling thermal expansion are compared. The Kumar equation was found most useful for high-temperature extrapolation. With four parameters (θ^Fo_D, θ^Fa_D, k_Fo, k_Fa) fixed at values reported in the literature, it suffices to refine only two parameters (Q^Fo₀, Q^Fa₀ ) along with the composition-specific V(0 K) in order to describe the thermal expansion in the whole olivine series. The chosen data set is internally consistent as the thermal expansions of forsterite (Fo) and fayalite (Fa) are correctly predicted, even if only V(T) data of compositionally intermediate olivines are used. These results resolve the discrepancies between the thermal expansivities of Fo and Fa reported in the literature and are applied to a variety of thermophysical parameters with a significant dependence on the thermal expansion, as follows.