Sedimentological and tectonic features of the Poprad sandstone member, Eocene, Magura Nappe: case study of the Klikuszowa quarry, Outer West Carpathians, Poland
This paper gives an overview of principal sedimentological and structural features observed within the uppermost Eocene, thick-bedded turbidites of the Krynica subunit, Magura Nappe, that are exposed at Klikuszowa in a zone of change of the dominant orientation of thrusts and folds, from NE-SW in the west, to W-E in the east. The succession exposed in the Klikuszowa quarry represents the middle-fan distributary channel depositional system. Flute casts indicate palaeocurrent directions from the south-east and south. The distribution of transparent heavy minerals in these sandstones is characterised by the predominance of garnet, which content distinctly increases as compared to that of the underlying Szczawnica Formation and the lower part of the Magura Formation, with mixed garnet-zircon-tourmaline-rutile-apatite spectra. The presence of chromite throughout the entire succession of the Krynica subunit is noteworthy. The specific location of the study area enabled us to reconstruct a sequence of structural events recorded by small-scale tectonic features. The following post-folding episodes of faulting have been recognised: submeridional compression and thrust-wrenching, pure strike-slip faulting, N 20 degrees W extension and wrenching, and three subsequent events of normal faulting, associated with the WNW-, ENE- and NE-orientated extension. These events took place between the early Oligocene and late Serravallian times.
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