Reconstruction of stress directions in the Magura and Silesian Nappes (Polish Outer Carpathians) based on analysis of regional folds

Authors

  • Ryszard Szczęsny Faculty of Geology, University of Warsaw, Al. Zwirki i Wigury 93, PL-02-089 Warszawa, Poland

Keywords:

Polish Outer Carpathians, stress reconstruction, regional folds, axes directions

Abstract

Statistic analysis of the bed orientation in the Magura and Silesian Nappes was performed in order to establish the directions of regional fold axes. On this ground, variations of the main horizontal stress directions were inferred for both nappes. In the Late Oligocene, in the foreland of the northwards moving Adriatic Microplate, a fan-like pattern of the s1 stress trajectories was formed. Initiation of the Magura Nappe and the related regional folds began in such conditions. Evolution of the regional compression involved clockwise rotation from S-N to SW-NE direction. The rotation was caused by the Early Miocene oblique collision of the Carpathian Orogen with the East European Platform. The pattern of fold axes in the Silesian Nappe reflects this rotation.

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Published

2010-03-27

Issue

Vol. 47 No. 3 (2003)

Section

Articles

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