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Geological position and origin of augen gneisses from the Policka Unit, eastern Bohemian Massif
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Augen gneisses are a peculiar lithological type of the Policka Unit (PU), which can be divided into two main petrographic groups: augen metagranitoids and migmatitic augen gneisses. Both of the groups represent products of magmatic and metamorphic processes along the contact between the Svratka and Policka units in the eastern Bohemian Massif.
Tonalitic to granodioritic synkinematic intrusions were emplaced into metasedimentary rocks of the Policka Unit during the Late Variscan orogeny, forming plutonic bodies and dykes. Residual fluids from granitic melts pervasively infiltrated the ...
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Two Types of "Augen Gneisses" in the Snieznik Metamorphic Unit, West Sudetes, Poland
Magazine article from: Geolines
; ...orientation and complication of their fabric and, most of all, position and genesis of title "augens". In the Snieznik augen gneisses (metagranites), the augen structure results from the constriction and flattening of the original porphyritic granite...
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Discussion on the evolution of the Southern Menderes Massif in SW Turkey as revealed by zircon dating / Reply
Magazine article from: Journal of the Geological Society
; ...evidence (single zircon ages) from the augen gneisses of the southern Menderes Massif (SW...formation of tectonic lenses of the augen gneisses within the schists and vice versa...scatter of single zircon ages from the augen gneisses, Bozkurt et al. (1995) pointed...
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Foreword to the special volume on "Geological development of the region at the NE periphery of the Moldanubian Zone, eastern part of the Bohemian Massif"
Magazine article from: Journal of Geosciences
; ...lithological type termed "pearl gneiss" in the lower part of the Policka Unit (Bohemicum) and exceptionally present in the tectonic segments...present melting related to the tonalit intrusions in the Policka Unit (Budislav and Mietin plutons) produced porphyroblastic...
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The evolution of the southern Menderes Massif in SW Turkey as revealed by zircon dating
Magazine article from: Journal of the Geological Society
; ...U-Pb methods. We have analysed zircons from granitic augen gneisses of the core as well as from quartzites of the metasedimentary...that are variably deformed and often develop the texture of augen gneisses, and which contain plagioclase, K-feldspar, quartz...
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Ordovician metagranites and migmatites of the Svratka and Orlice-Snezník units, northeastern Bohemian Massif
Magazine article from: Journal of Geosciences
; ...lithotectonic units - the Moldanubian Zone in the SE (exhumed lower- to midcrustal Variscan crust; Urban and Synek 1995) and the Policka Unit in the NE (Burianek et al. 2003) (Fig. 1). In general, the metamorphic fabrics in the SU are roughly parallel to...
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Studies from L. Pinarelli and co-authors have provided new information about mineralogy and petrology.
Newspaper article from: Mining & Minerals
; ...and colleagues. The researchers concluded: The observed chemical and isotope patterns, as well as the vicinity of the augen gneisses to the Ordovician intrusions, lead us to conclude that the Ceneri augengneisses and Hbl augengneisses are the result of...
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Early Palaeozoic Syntectonic Migmatization Preceded Variscan Metamorphism in the Orlica-Snieznik Dome, Sudetes: U-Pb SHRIMP Evidence
Magazine article from: Geolines
; ...data from the eastern OSD, has recently been reached by Lange et al. (in prep.). Our studies revealed that although augen gneisses and migmatitic gneisses outcropped in the Miedzygorze structure display little differences in geochemistry, they differ...
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The orthogneisses of the Orlica-Snieznik complex (West Sudetes, Poland): geochemical characteristics, the importance of pre-Variscan migmatization and constraints on the cooling history
Magazine article from: Journal of the Geological Society
; ...Grzeskowiak & Zelazniewicz 2002). At other places, migmatitic rocks apparently developed at the expense of the augen-gneisses (e.g. Don 2001). It is unclear whether the latter type records a single process or documents multiple episodes of...
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Nature and distribution of deep crustal reservoirs in the southwestern part of the Baltic Shield: Evidence from Nd, Sr and Pb isotope data on late Sveconorwegian granites
Magazine article from: Journal of the Geological Society
; ...granites are similar in Sr and Nd characteristics to some of the older (1.05 Ga) Sveconorwegian granitic intrusions (`augen gneisses') in the region in terms of radiogenic isotope systematics, but Pb isotopes suggest that the magmas did not form by simple...
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