caa a22 4500 467890145 CHVBK 20180406152746.0 cr unu---uuuuu 170328e20060301xx s 000 0 eng 10.1007/s00710-005-0114-4 doi (NATIONALLICENCE)springer-10.1007/s00710-005-0114-4 Kinematic and rheological model of exhumation of high pressure granulites in the Variscan orogenic root: example of the Blanský les granulite, Bohemian Massif, Czech Republic [Elektronische Daten] [J. Franěk, K. Schulmann, O. Lexa] Summary: A large-scale relict domain of granulite facies deformation fabrics has been identified within the Blanský les granulite body. The granulite facies mylonitic fabric is discordant to the dominant amphibolite facies structures of the surrounding retrograde granulite. The complex geometry of retrograde amphibolite facies fabric indicates a large-scale fold-like structure, which is interpreted to be a result of either crustal-scale buckling of an already exhumed granulite sheet or active rotation of a rigid granulite facies ellipsoidal domain in kinematic continuity with the regional amphibolite facies deformation. We argue that both concepts allow similar restoration of the original granulite facies fabrics prior to the amphibolite facies deformation and "folding”. The geometry of the granulite facies foliations coincides with the earliest fabrics in the nearby mid-crustal units suggesting complete mechanical coupling between the deep lower crust and the mid-crustal levels during the vertical movements of crustal materials. Microstructures indicate grain-size sensitive flow enhanced by the presence of silicate melts at deep crustal levels and a beginning of an exhumation process of low viscosity granulites through a vertical channel. The amphibolite facies fabrics developed at middle crustal levels and their microstructures indicate significant hardening of feldspar-made rigid skeleton of the retrograde granulite. Increase in the strength of the granulite allowed an active buckling or a rigid body rotation of the granulite sheet, which acted as a strong layer inside the weaker metasediments. Springer-Verlag/Wien, 2006 Franěk J. Centre de Géochimie de Surface, UMR CNRS 7516, Strasbourg, France aut Schulmann K. Centre de Géochimie de Surface, UMR CNRS 7516, Strasbourg, France aut Lexa O. Centre de Géochimie de Surface, UMR CNRS 7516, Strasbourg, France aut Mineralogy and Petrology Springer-Verlag 86/3-4(2006-03-01), 253-276 0930-0708 86:3-4<253 2006 86 710 https://doi.org/10.1007/s00710-005-0114-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-005-0114-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Franěk J. Centre de Géochimie de Surface, UMR CNRS 7516, Strasbourg, France aut NATIONALLICENCE 700 1- Schulmann K. Centre de Géochimie de Surface, UMR CNRS 7516, Strasbourg, France aut NATIONALLICENCE 700 1- Lexa O. Centre de Géochimie de Surface, UMR CNRS 7516, Strasbourg, France aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer-Verlag 86/3-4(2006-03-01), 253-276 0930-0708 86:3-4<253 2006 86 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer