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

Emilie Bruand, K. Stuwe, A. Proyer

    Research output: Contribution to journalArticlepeer-review

    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.
    Original languageEnglish
    Pages (from-to)75-87
    Number of pages13
    JournalMineralogy and Petrology
    Volume99
    Issue number1-2
    DOIs
    Publication statusPublished - 2009

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