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High-pressure metamorphism in gneisses and pelitic schists in the East Rhodope zone (N. Greece)

Hochdruck-Metamorphose in Gneisen und pelitischen Schiefern der östlichen RhodopeZone, Nord-Griechenland

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Summary

The high-alumina metapelites and the orthogneisses of the lower tectonic unit of East Rhodope underwent high P/T metamorphism followed by partial reequilibration during decompression under epidote-amphibolite/amphibolite facies to greenschist facies conditions. The high P/T mineral paragenesis in the orthogneisses is: quartz + albite + microcline + phengite (Simax = 7 atoms p.f.u.) + biotite and in the high alumina metapelites: garnet + chloritoid + chlorite + phengite (Simax. = 6.85 atoms p.f u.) + paragonite + quartz. Pressures between 14 and 15.5 kbar, for Tmin = 550°C, are estimated for the high P/T metamorphism. During continuing uplift, staurolite + chlorite, staurolite + biotite and finally andalusite + Fe-ripidolite are grown at the expense of chloritoid in metapelites, while in the orthogneisses oligoclase, still coexisting with albite, is formed; in both rock types the Si content of white K-mica decreases considerably from almost pure phengite to pure muscovite.

Zusammenfassung

Die Aluminium-reichen Metapelite und die Orthogneise der unteren tektonischen Einheit der östlichen Rhodope-Zone wurde unter hohen Drucken und Temperaturen metamorphosiert. Darauf folgte eine teilweise Reequilibration unter Druck-Entlastung bei Bedingungen der Epidot-Amphibolit/Amphibolit bis Grünschiefer Fazies. Die Hoch-P/T Mineral-Assoziation in den Orthogneisen besteht aus: Quarz + Albit + Mikroklin + Phengit (Simax = 7 atoms p.f.u.) + Biotit und in den Aluminium-reichen Metapeliten: Granat + Chloritoid + Chlorit + Phengit (Simax = 6.85 atoms p.f.u.) + Paragonit + Quarz. Drucke zwischen 14 and 15.5 kbar für Tmin = 550°C wurden für die Hoch- P/T Metamorphose berechnet. Während andauernder Anhebung bildeten sich Staurolit + Chlorit, Staurolit + Biotit und schließlich Andalusit + Fe-Ripidolit auf Kosten von Chloritoid in den Metapeliten, während in den Orthogneisen Oligoklas der noch mit Albit koexistiert, gebildet wurde; in beiden Gesteinstypen nimmt der Si-Gehalt heller Kaliglimmer von fast reinem Phengit bis zu reinem Muskowit ab.

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Authors and Affiliations

  1. Department of Geological Sciences, National Technical University, Patission 42, 10 682, Athens, Greece

    E. Mposkos

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Mposkos, E. High-pressure metamorphism in gneisses and pelitic schists in the East Rhodope zone (N. Greece). Mineralogy and Petrology 41, 25–39 (1989). https://doi.org/10.1007/BF01164808

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