--> Abstract: The Dynamic Model of the Polish Carpathian Foredeep, by N. Oszczypko; #90942 (1997).

Datapages, Inc.Print this page

Abstract: The dynamic model of the Polish Carpathian Foredeep

OSZCZYPKO, NESTOR

The Outer Western Carpathians are built up of a stack of nappes and thrust sheets overthrust onto the Miocene deposits of the Carpathian Foredeep. Recognized by boreholes, the depth of the platform basement ranges from few hundred meters up to 3 500 m in the Carpathian Foredeep, whereas in the south of the Carpathian margin, this value ranges from 500 to 7000 m. The depth of magneto-telluric basement varies from 3-5 km in the northern part of the Carpathians, dips to approximately 15-20 km at its deepest point, then peaks at about 8-10 km in the southernmost part. The axis of the basement depression coincides more or less with the axis of the gravimetric minimum. The outer foredeep is filled up with Badenian and Sarmatian marine deposits up to 3500 m in thickness, whereas the inner foredeep located beneath the Carpathians is composed of the Lower to Middle Miocene autochthonous deposits up to 1500 m thick. The Miocene subsidence in the Carpathian Foredeep was due to the foredeep sediments and thrust-induced load. The total subsidence was 1.6 - 2.1 times higher than tectonic subsidence. During the Lower to Middle Miocene the mean rate of the frontal Carpathian thrusting, is approximated as 7.7- 12.3 mm/yr. During that time, the loading effect of thickening Carpathian wedge on foreland plate increased. It caused an increase in total subsidence. During the Late Badenian-Sarmatian time the rate of overthrusting was less than that of pinch-out migration (138 mm/yr) and this resulted in basin widening. The Early to Middle Miocene shifting of the Carpathian wedge resulted in migration of depocenters and onlapping of the successively younger deposits onto the foreland plate.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria