Structural evolution of the Gnieździska Syncline - regional implications for the SW Mesozoic margin of the Holy Cross Mountains (Central Poland)

Andrzej Konon, Leonard Mastella


Ewolucja strukturalna synkliny Gnieździsk - regionalne imlikacje dla południowo-zachodniego mezozoicznego obrzeżenia Gór Świętokrzyskich

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.

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