International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

Deformation record and revised tectonic evolution of the Nízke Tatry Mts. in the Tatric – Veporic junction area: Insights from structural analysis

Published: Jun 2023

Pages: 197 - 210



Abstract: The Nízke Tatry Mts. is a mountain range located in the central part of the Western Carpathians. Throughout history, the studied area has been affected by at least two orogenetic cycles – Variscan and Alpine. Based on structural analyses, it is possible to determine several deformation events. The older deformations (DV), which were accompanied by the Variscan higher-grade metamorphism, are characterised by penetrative tectonic foliations, such as schistosity and gneissic banding, and go hand in hand with folds and lineations. In contrast, the younger deformations (DA) are marked by structural evolution under low-grade (retrograde) metamorphism, phyllitic foliations, crenulation foliation, cataclasis, and minor recrystallisation. The Variscan deformation (DV2) is the earliest pervasive deformation with pronounced evolution of SV2 metamorphic foliation, locally with preserved isoclinal and rootless folds of SV1 planar fabric. Stretching and mineral lineations (LV2) are usually oriented in the ENE–WSW direction. The fabric of DV2 is intensively affected by folds (FV3) and, in many places, marked by development of SV3 axial planes. The Alpine deformation (DA1) was accompanied by low-grade metamorphism and depicted by space to zonal with pervasive foliation (SA1) in some areas. This deformation is characterised by a typical crenulation cleavage, where SV2 planes are folded and produced SA1 foliation. The crenulation and intersection lineations (LA1c) have NE–SW to E–W trends. The DA1 deformation is also accompanied by pronounced evolution of NNW–SSE groove, stretching, and mineral lineation (LA1t). Shortening in the NNW–SSE direction is also evidenced by asymmetric folds with an ENE–WSW orientation of fold axes (FA1) and line intersections (LA1c) with pronounced top-to-the-NNW tectonic transport. The youngest observed Alpine deformation (DA2) is related to an extension of the Tatric crystalline basement with top-to-the-east transport defined by Alpine lineations (LA2) on spaced planar structures (SA2) and correspond to C surfaces.

Keywords: Central Western Carpathians, Nízke Tatry Mts., Variscan deformation, Alpine deformation, fabric

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