--> Abstract: Tectonic Evolution of the Outer Ukrainian Carpathians and Their Foreland in Miocene Time, by Ihor M. Bubniak; #90039 (2005)

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Tectonic Evolution of the Outer Ukrainian Carpathians and Their Foreland in Miocene Time

Ihor M. Bubniak
Franko Lviv University, Lviv, Ukraine

The tectonic model of the evolution of the Outer Ukrainian Carpathians and their foreland during Miocene time is presented. This model is based on a multidisciplinary approach, including flexural modelling of the Western Ukraine lithosphere, subsidence analysis of the sedimentary fill and mesostructural analysis in the fold and thrust belt. Flexural modelling indicates that formation of regional structure was connected with retreating continental subduction zones and that the load of the thrusts, sediments and water were not sufficient to create the present-day structures observed. Subsidence in the front of the orogen was coeval with the nappe emplacements in the Carpathian area which influenced the character of the subsidence in the foredeep. The distribution of sedimentation ratios indicate that supply of sediment was from both the craton and the accretionary wedge. Paleostress analysis based on the investigations of the jointing, fault-slip analysis and local folds reveals that stress fields have changed in the direction and type. The deformational sequence in the Ukrainian Carpathians includes NE and E directed thrusting from Oligocene to Miocene, wrench faulting with a similar orientation and extension with a different orientation that is of unknown age. In the foredeep and on the SW slope of the East-European platform normal faulting developed in Miocene times. In summary the development of the western part of the Ukraine in the Miocene was reflects the transition from a passive continental margin through a remnant flysch basin to a foredeep.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005