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Character and structural evolution of the Mała Łąka Fault in the Tatra Mts., Carpathians, Poland

Dąbrowska M., Jurewicz E.

Acta Geologica Polonica

2013

Vol. 63, no. 1

137-151

Dąbrowska, M. and Jurewicz, E. 2013. Character and structural evolution of the Mała Łąka Fault in the Tatra Mts., Carpathians, Poland. Acta Geologica Polonica, 63 (1), 137-151. Warszawa. The Mała Łąka Fault in the Tatra Mts. is a synsedimentary normal fault responsible for the variable thickness of Eocene deposits in the area. Its main activity took place in the interval from the sedimentation of red conglomerates to the appearance of nummulitic limestones. The estimated throw is up to 350 m. Near the northern margin of the Tatra Mts., the trend of the fault changes from N.S to NE.SW. This part of the fault could have been activated during the Neogene uplift of the Tatra Mts. and rejuvenated as a sinistral fault. In the upper reach of the Mała Łąka Stream, the fault trend does not follow the course of the Mała Łąka Valley. Here, the flowing stream waters used extensional fractures within a damage zone associated with the Mała Łąka Fault rather than the lithological boundary at the tectonic contact between the Triassic dolomites and the Eocene conglomerates. The fault has a hingelike character; its hinge was located in the present-day Kościeliska Valley, c. 2.5 km west of the Mała Łąka Valley.

Przestrzenny model utworów eocenu numulitowego pomiędzy Doliną Małej Łąki a Doliną Lejową w Tatrach

Tomaszczyk M., Rubinkiewicz J., Borecka A.

Przegląd Geologiczny

2009

Vol. 57, nr 1

68-68

The study area is located in the northern part of the Tatra Mts. The 3D geological model of the nummulitic Eocene is based on geological surface data, cross-sections as well as digital elevation model. Model contains six lithological units: nummulitic limestones, detritic limestones, dolomitic sandstones, grey conglomerates, red conglomerates and also comprise two vertical faults. Geological model allows to create solids, surfaces and various horizontal and vertical sections. Based on these it was possible to estimate spatial distribution and thickness variations of modeling units and verify position of geological contacts. An analysis of the model defined fault’s displacement parameters and confirmed synsedimentary origin of faults.