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Post-collisional Late Middle Miocene (Sarmatian) Pieniny Volcanic Arc, Western Carpathians

Birkenmajer K.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2003

Vol. 51, nr 1

79-89

The late Middle Miocene (Sarmatian) volcanics of the Pieniny Mts (West Carpathians, Poland) form a swarm of small- to moderate-scale hypabyssal andesitic bodies - dykes and sills. They intruded Palaeogene flysch rocks of the Magura Nappe (Outer Carpathians), and Jurassic-Cretaceous deep-water marine deposits of the Grajcarek Unit - the northernmost tectonic unit of the Pieniny Klippen Belt. The intrusives are represented by high-K basaltic andesites and medium-K andesites, with mayor and trace elements characteristics within the range of subduction- to collision-related magmas, and multi-element patterns characteristic of subduction-related magmas. 40 K-Ar dates obtained from 27 andesite sites, determine the intrusive activity at between 13.5 Ma and c. 11 Ma, the most preferable age interval being 12.5-10.8 Ma. The Pieniny andesite intrusions belong to a post-collisional volcanic arc located in the innermost zone of the Outer Carpathian accretionary prism. They post-date the Savian collision (c. 23 Ma) in the Western Carpathians by about 10 Ma. Magmatic chamber of the andesites was probably located at the depth of 10-12 kms below the surface, within the Outer Carpathian accretionary prism, above the underthrust slab of the North-European platform.