STUCTURAL EVOLUTION OF THE GNIE¬DZISKA SYNCLINE - REGIONAL IMPLICATIONS FOR THE SW MESOZOIC MARGIN OF THE HOLY CROSS MOUNTAINS (CENTRAL POLAND)

Andrzej KONON & Leonard MASTELLA

Institute of Geology, University of Warsaw, Al. ¯wirki i Wigury 93, 02-089 Warszawa

Konon, A. & Mastella, L., 2001. Stuctural evolution of the Gnie¼dziska Syncline - regional implications for the SW Mesozoic margin of the Holy Cross Mountains (Central Poland). Annales Societatis Geologorum Poloniae, 71: 189-199.

Key words: mechanisms of fold deformation, palaeostress reconstruction, Holy Cross Mountains, Poland.
Abstract: Basing on analysis of tectonic mesostructures, the structural evolution stages of the Gnie¼dziska Syncline have been determined. The structure represents a typical example of folds occurring in the SW margin of the Holy Cross Mountains. The well-exposed syncline displays a wide variety of structures, including: shear and extension joints, stylolites, cleavage, strike-slip and dip-slip faults as well as master joints. Tectonic structures resulting from flexural slip indicate that the Gnie¼dziska Syncline developed as a flexural-slip fold as a result of horizontal NE-SW compression. The subsequent deformation phase included mesostructures pointing to the increasing activity of a nearby Gnie¼dziska-Wola Morawiecka dextral strike-slip fault of regional extent. In the terminal phase of the post-kinematic uplift of the Holy Cross Mountains, T joints and master joints appeared.
Annales
Societatis
Geologorum
Poloniae

 

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