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Pseudosection modelling for a selected eclogite body from the Koralpe (Hohl), Eastern Alps

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Abstract

In the Kor-, Saualpe and Pohorje regions of the Eastern Alps eclogite bodies occur within metapelitic gneisses. The bodies are between 1 meter and several hundreds of meters in size and some of them were defined by Haüy (1822) as the type locality for the rock type “eclogite”. A growing body of petrological work has documented the metamorphic evolution of the metapelites surrounding the eclogites. However, few phase diagrams have been constructed for the eclogite bodies themselves. Here we use recently available activity models for amphiboles to present new thermodynamic pseudosections for the Hohl locality of the Koralpe eclogites. We show that this eclogite reached peak conditions in a narrow PT field obliquely oriented in PT space between 16.5 and 20.5 kbar and 620°C to 720°C and that its metamorphic evolution was likely to have occurred under water saturated conditions. We conclude that eclogite and the surrounding metapelites have certainly undergone the same metamorphic peak in Eo-alpine time. Comparison of our results with different PT estimates on the eclogite from Pohorje, suggest that a PT gradient from Koralpe to Pohorje is likely.

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Acknowledgements

The authors wish to thank W Postl for sampling and discussion, R Powell for his files and precious advices on pseudosection calculations and C Hauzenberger for the XRF analyses. Grateful thanks are also to F Zaccharini for the help provided with the microprobe analyses. The paper was written with financial support of FWF project P19366-N10.

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  1. Institut für Erdwissenschaften, Karl-Franzens-Universität, Universitätsplatz 2, 8010, Graz, Austria

    Emilie Bruand, Kurt Stüwe & Alexander Proyer

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  1. Emilie Bruand
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Correspondence to Emilie Bruand.

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Bruand, E., Stüwe, K. & Proyer, A. Pseudosection modelling for a selected eclogite body from the Koralpe (Hohl), Eastern Alps. Miner Petrol 99, 75–87 (2010). https://doi.org/10.1007/s00710-009-0097-7

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