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

In the central part of the Krusne 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 AM assemblage garnet-kyanite in the Medenec area has equilibrated at 640 degreesC and 22 kbar, whereas the two-phase assemblage garnet-chloritoid in the Smi 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.