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

TECTONIC AND STRUCTURAL IMPLICATIONS OF PALEOMAGNETIC AND AMS STUDY OF HIGHLY METAMORPHOSED PALEOZOIC ROCKS FROM THE GEMERIC SUPERUNIT, SLOVAKIA

Pages: 133 - 144

Authors: JADWIGA KRUCZYK, MAGDALENA KADZIALKO-HOFMOKL, MARIA JELENSKA, IGOR TUNYI, PAVOL GRECULA, DANIEL NAVESNAK

Abstract: Paleozoic highly metamorphosed rocks were sampled in 4 localities situated along the Kosice-Margecany shearing zone (East-Carpathian dextral system), on two sites situated close to the Dobsina shearing zone (West-Carpathian sinistral system), and on one site situated within the Gemeric Superunit. The West-Carpathian and East-Carpathian shearing systems resulted in the division of Gemeric Superunit into a mosaic of small tectonic blocks. Each site sampled for this study represents one such block. Our paleomagnetic study revealed that the rocks became remagnetized in the Middle Miocene after a regional CCW rotation, probably during the period between anomaly 6 (20 Ma) and anomaly 5 (10 Ma). After the remagnetization epizodes the blocks underwent rotations (around their vertical axes) associated with activity of respective dextral or sinistral shearing zones. The results of the AMS study suggest a correlation between the magnetic fabric and the Alpine tectonic deformation episodes.

Keywords: Gemeric Superunit, Paleozoic, paleomagnetism, AMS, tectonic deformations

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