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Eclogitic micaschists in the central part of the Kruné hory Mountains (Bohemian Massif)

Jií KONOPÁSEK^*

Institute of Petrology and Structural Geology, Faculty of Science, Charles University, Albertov 6, 128 43, Prague 2, Czech Republic
Geophysical Institute, Czech Academy of Science, Boní II/1401, 141 31, Prague 4, Czech Republic

^* e-mail: kony{at}natur.cuni.cz

In the central part of the Kruné hory (Erzgebirge) Mountains (Saxothuringian domain of the Bohemian Massif) in the Czech Republic, mafic eclogites are associated with a horizon of garnetiferous micaschists. In these rocks, analysis of stable mineral assemblages together with thermodynamic modelling of their evolution shows that the two-phase AFM assemblage garnet-kyanite in the Mdnec area has equilibrated at 640°C and 22 kbar, whereas the two-phase assemblage garnet-chloritoid in the Srní area represents amphibolite-facies conditions. The matrix mineral assemblages show that subsequent decompression is not associated with temperature increase. The observed metamorphic evolution suggests rapid exhumation of the eastern margin of the Saxothuringian domain after its subduction below an already thickened orogenic root.

Key-words: metasediments, eclogites, high-pressure metamorphism, Erzgebirge, Bohemian Massif.

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