Metamorphic history of glaucophane-paragonite-zoisite eclogites from the Shanderman area, northern iran

H. Omrani, M. Moazzen, R. Oberhänsli, T. Tsujimori, R. Bousquet, M. Moayyed

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    The Shanderman eclogites and related metamorphosed oceanic rocks mark the site of closure of the Palaeotethys ocean in northern Iran. The protolith of the eclogites was an oceanic tholeiitic basalt with MORB composition. Eclogite occurs within a serpentinite matrix, accompanied by mafic rocks resembling a dismembered ophiolite. The eclogitic mafic rocks record different stages of metamorphism during subduction and exhumation. Minerals formed during the prograde stages are preserved as inclusions in peak metamorphic garnet and omphacite. The rocks experienced blueschist facies metamorphism on their prograde path and were metamorphosed in eclogite facies at the peak of metamorphism. The peak metamorphic mineral paragenesis of the rocks is omphacite, garnet (pyrope-rich), glaucophane, paragonite, zoisite and rutile. Based on textural relations, post-peak stages can be divided into amphibolite and greenschist facies. Pressure and temperature estimates for eclogite facies minerals (peak of metamorphism) indicate 15-20 kbar at ~600 °C. The pre-peak blueschist facies assemblage yields <11 kbar and 400-460 °C. The average pressure and temperature of the post-peak amphibolite stage was 5-6 kbar, ~470 °C. The Shanderman eclogites were formed by subduction of Palaeotethys oceanic crust to a depth of no more than 75 km. Subduction was followed by collision between the Central Iran and Turan blocks, and then exhumation of the high pressure rocks in northern Iran.

    Original languageEnglish
    Pages (from-to)791-812
    Number of pages22
    JournalJournal of Metamorphic Geology
    Volume31
    Issue number8
    DOIs
    Publication statusPublished - Oct 1 2013

    Keywords

    • Eclogite
    • Late Palaeozoic
    • North Iran
    • P-T path
    • Palaeotethys
    • Shanderman

    ASJC Scopus subject areas

    • Geology
    • Geochemistry and Petrology

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  • Cite this

    Omrani, H., Moazzen, M., Oberhänsli, R., Tsujimori, T., Bousquet, R., & Moayyed, M. (2013). Metamorphic history of glaucophane-paragonite-zoisite eclogites from the Shanderman area, northern iran. Journal of Metamorphic Geology, 31(8), 791-812. https://doi.org/10.1111/jmg.12045