ASGP (2001), vol. 71: 189-199

STUCTURAL EVOLUTION OF THE GNIEŹDZISKA 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. Żwirki i Wigury 93, 02-089 Warszawa

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

Abstract: Basing on analysis of tectonic mesostructures, the structural evolution stages of the Gnieździska 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 Gnieździska 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 Gnieździska-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.