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Eclogite-facies metamorphism at the eastern margin of the Bohemian Massif — subduction prior to continental underthrusting?

Jií KONOPÁSEK^1,*, Karel SCHULMANN¹ and Vra JOHAN²

¹ Universita Karlova, Institute of Petrology and Structural Geology, Albertov 6, 128 43 Praha 2, Czech Republic
² Bureau des Recherches Géologiques et Minières, Orléans, France

^* Corresponding author, present address: Tektonophysik — Institut für Geowissenschaften, Johannes-Gutenberg Universität Mainz, Becherweg 21, D-55099 Mainz, Germany e-mail: konopase{at}mail.uni-mainz.de

In garnetiferous micaschists occurring at the northern termination of the Moravian domain, metabasites were found containing relics of eclogite-facies assemblages. In these rocks, minimum pressure conditions of 13 kbar at temperatures of 625–655 °C were followed by decompression to amphibolite-facies conditions. Surrounding metapelites contain Fe-rich chloritoid and Fe-rich staurolite preserved as inclusions in garnet porphyroblasts indicating early PT conditions of 570 °C at pressures of 6–7 kbar. The matrix assemblage shows an increase of temperature and pressure to about 615 °C at 6.5–9 kbar. The PT paths of both metapelite and amphibolitized eclogite are suggested to converge at the peak temperature conditions of the metasediments.

The PT evolution of the eclogitic sample and of the surrounding metapelites is different from the PT history of the same rocks occurring in the Moldanubian domain but similar to that of the Moravian metasediments. Thus, the presence of eclogite-facies metamorphism at the eastern margin of the Bohemian massif suggests early subduction and subsequent collision of the Brunovistulian foreland with the internal Variscan orogenic root domain.

Key-words: eclogite, metapelite, PT conditions, Moravian domain, Bohemian Massif.

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				K. Schulmann, A. Kroner, E. Hegner, I. Wendt, J. Konopasek, O. Lexa, and P. Stipska Chronological constraints on the pre-orogenic history, burial and exhumation of deep-seated rocks along the eastern margin of the Variscan Orogen, Bohemian Massif, Czech Republic Am J Sci, May 1, 2005; 305(5): 407 - 448. [Abstract] [Full Text] [PDF]