ASGP (2009), vol. 79: 41-52

DEFORMATION STRUCTURES IN THE GNEISSIC EXOTIC PEBBLES FROM THE AREA OF WOŁOSATE (CISNA SANDSTONE, DUKLA TECTONIC UNIT, OUTER CARPATHIANS, POLAND)

Maciej KANIA & Anna WOLSKA

Institute of Geological Sciences, Jagiellonian University, ul. Oleandry 2a, 30-063 Kraków, Poland, e-mails: maciej.kania at uj.edu.pl, a.wolska at uj.edu.pl

Kania, M. & Wolska, A., 2009. Deformation structures in the gneissic exotic pebbles from the area of Wołosate (Cisna sandstone, Dukla tectonic unit, Outer Carpathians, Poland). Annales Societatis Geologorum Poloniae, 79: 41-52.

Abstract: Gneissic exotic pebbles from the Cisna beds (Dukla tectonic unit) in the region of Wołosate (Biesz- czady Mts., Eastern Carpathians) were investigated. These exotic pebbles are from 9.5 to 13 cm in size. Basing on the structural features, the following groups of exotic pebbles were distinguished: granitic gneisses, laminated gneisses, flaser gneisses and mylonitic gneisses. Granite - granodiorite protolith was deformed in the shear zone; strain partitioning was probably an important process during deformation. The observed structures allow to determine the temperature of metamorphism as 500-550°C. The lower limit of pressure was determined basing on phengite geobarometer as 5 kbar. The nature and localization of the source area can be similar to the Bretila sequence from the Romanian Eastern Carpathians.