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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Tertiary Kinematics of the Intra-Carpathian
Area
By
1Eotvos University, 1088 Budapest,
Muzeum korut 4/A, Hungary
2Slovakian Academy of Sciences, 81473 Bratislava,
Czech and Slovakian Republics
3Rice
University, Houston, Texas 77251-1892, USA
The extensional Pannonian basin of the intra-Carpathian
area formed synchronously with the compression
along the Carpathian loop during the Neogene (middle to
late Miocene). Recent reconstructions of the original position
of flysch nappes in the Western Carpathians indicate
that the magnitude
of shortening in this thrust-fold belt is
much higher than it was previously thought. Based on this
estimate we restored the pre-Neogene geometry of the
intra-Carpathian area. The resulting kinematic picture
assumes significant strike-slip and extensional displacements
on major transtensional structural features in the
Pannonian basin.
The Neogene back-arc basin is superimposed on a set of dissected Paleogene (middle Eocene to lowermost Miocene) basins of apparently different origin. Indeed, these basins do not form a single basin in the reconstructed middle Miocene kinematic picture. The same holds for Mesozoic facies successions showing a peculiar inverted paleogeography. This controversy can be resolved by a further step in the kinematic reconstruction, namely by a late Oligocene-early Miocene episode of eastward directed continental escape of the present-day northwestern part of the Pannonian basin from the Alpine realm. The escaping unit was bordered by the Pieniny Klippen Belt in the north and the Mid-Hungarian Line in the south. The latter shear zone has accommodated roughly 400 km of right-lateral displacement, using the offset between the Paleogene basins of Hungary and Slovenia, as kinematic markers. In the restored pre-escape kinematic picture, the Paleogene basins of the intra-Carpathian area line up in a single basin and the Mesozoic facies distribution also ends up in a consistent pattern.
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