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The effect of iron on the P2 (sub 1) /c to C2/c transition in (Mg,Fe)SiO (sub 3) clinopyroxenes

Nancy L. Ross and Bruno Reynard
The effect of iron on the P2 (sub 1) /c to C2/c transition in (Mg,Fe)SiO (sub 3) clinopyroxenes
European Journal of Mineralogy (June 1999) 11 (3): 585-589

Abstract

High-P Raman spectroscopy has been used to study the effect of iron on the low-clinoenstatite (P2 (sub 1) /c) to high-density clinoenstatite (C2/c) transition for clinopyroxenes along the MgSiO (sub 3) -FeSiO (sub 3) join. For the MgSiO (sub 3) end-member, with rising P the transition to the C2/c structure occurs at 7.89 GPa and reverts to P2 (sub 1) /c symmetry with decreasing P. Both the transition P and the hysteresis of the transition decreases markedly with addition of iron; the transition has been bracketed to + or - 0.5 GPa for compositions with X (sub Fe) > or = 30 %. The variation of the transition P with increasing Fe can be described in the equation: P (sub t) (GPa) = (5.97 + or - 0.14) - (4.26 + or - 0.23)X (sub Fe) . The decrease in transition P and the hysteresis of the P2 (sub 1) /c to C2/c transition observed in Fe-bearing clinopyroxenes may be due, in part, to crystal field stabilization energy arising from iron in the octahedral sites of the C2/c structure.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 3
Title: The effect of iron on the P2 (sub 1) /c to C2/c transition in (Mg,Fe)SiO (sub 3) clinopyroxenes
Affiliation: University College London, Department of Geological Sciences, London, United Kingdom
Pages: 585-589
Published: 199906
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 18
Accession Number: 1999-046907
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Ecole Normale Superieure de Lyon, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199916
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