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The Ca-Eskola component in eclogitic clinopyroxene as a function of pressure, temperature and bulk composition: an experimental study to 15 GPa with possible implications for the formation of oriented SiO2-inclusions in omphacite

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Abstract

Experiments have been conducted in the P-T range 2.5–15 GPa and 850–1,500°C using bulk compositions in the systems SiO2–TiO2–Al2O3–Fe2O3–FeO–MnO–MgO–CaO–Na2O–K2O–P2O5 and SiO2–TiO2–Al2O3–MgO–CaO–Na2O to investigate the Ca-Eskola (CaEs Ca0.5□0.5AlSi2O6) content of clinopyroxene in eclogitic assemblages containing garnet + clinopyroxene + SiO2 ± TiO2 ± kyanite as a function of P, T, and bulk composition. The results show that CaEsss in clinopyroxene increases with increasing T and is strongly bulk composition dependent whereby high CaEs-contents are favoured by bulk compositions with high normative anorthite and low diopside contents. In this study, a maximum of 18 mol% CaEsss was found at 6 GPa and 1,350°C in a kyanite-eclogite assemblage garnet + clinopyroxene + kyanite + rutile + coesite. By comparison, no significant increase in CaEsss with increasing P could be observed. If the formation of oriented SiO2-rods frequently observed in eclogititc clinopyroxenes is due to the retrogressive breakdown of a CaEs-component then these textures are a cooling rather than a decompression phenomenon and are most likely to be found in kyanite-bearing eclogites cooled from temperatures ≥750°C. The presence of clinopyroxene with approx. 4 mol% CaEsss in an experiment conducted at 2.5 GPa/850°C confirms earlier suggestions based on field data that vacancy-rich clinopyroxenes are not necessarily restricted to ultrahigh pressure metamorphic conditions.

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Acknowledgments

The setup of the multianvil press at the University of Innsbruck would not have been possible without the knowhow and experience of the BGI generously made available by Dave Rubie, Kurt Klasinski and Georg Hermannsdörfer. Their support is gratefully acknowledged. We would also like to thank three anonymous reviewers for their thorough reviews that helped to straighten out various mistakes and inaccuracies. This study was financially supported by the Austrian Science Foundation (grant No. P14851-N04) and conducted under the University of Innsbruck, Faculty of Geo and Atmospheric Sciences’ research program “geodynamics–geomaterials”

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  1. Institut für Mineralogie und Petrographie, Universität Innsbruck, Innrain 52, 6020, Innsbruck, Austria

    Jürgen Konzett

  2. Bayersisches Geoinstitut, Universität Bayreuth, 95440, Bayreuth, Germany

    Daniel J. Frost

  3. Institut für Erdwissenschaften, Fachbereich Mineralogie und Petrologie, Universität Graz, Universitätsplatz 2/II, 8010, Graz, Austria

    Alexander Proyer

  4. Institut für Mineralogie und Petrographie, ETH-Zentrum, 8092, Zurich, Switzerland

    Peter Ulmer

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  1. Jürgen Konzett
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Konzett, J., Frost, D.J., Proyer, A. et al. The Ca-Eskola component in eclogitic clinopyroxene as a function of pressure, temperature and bulk composition: an experimental study to 15 GPa with possible implications for the formation of oriented SiO2-inclusions in omphacite. Contrib Mineral Petrol 155, 215–228 (2008). https://doi.org/10.1007/s00410-007-0238-0

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