Article: Geological position and origin of augen gneisses from the Policka Unit, eastern Bohemian Massif

Article: Two Types of "Augen Gneisses" in the Snieznik ...
Geolines;  January 1, 2006 ;     700+ words ... ... 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 ...

Article: Discussion on the evolution of the Southern Menderes Massif in SW ...
Journal of the Geological Society;  March 1, 2001 ;     700+ words ... ... 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 ...

Article: Foreword to the special volume on "Geological development of the ...
Journal of Geosciences;  April 1, 2009 ;     700+ words ... ... 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 ...

Article: The evolution of the southern Menderes Massif in SW Turkey as ...
Journal of the Geological Society;  September 1, 1999 ;     700+ words ... ... 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 ...

Article: Ordovician metagranites and migmatites of the Svratka and ...
Journal of Geosciences;  April 1, 2009 ;     700+ words ... ... 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 ...

Dictionary definition: augen-gneiss
A Dictionary of Earth Sciences;      314 words ... ... banding is due to variations in the modal proportions (see MODAL ANALYSIS ) of the mineral phases constituting the rock. The best-developed augen-gneisses are formed by high-grade metamorphism of aluminous sediments. See also GNEISS .

Article: Studies from L. Pinarelli and co-authors have provided new ...
Mining & Minerals;  September 12, 2008 ;     700+ words ... ... 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 ...