HR: 11:05h
AN: T52B-04    [Abstracts]
TI: Rapid Lateral Transition Between Crustal and Llithospheric Folding In Post-Collisional Orogenic Setting: An Example From The SE Carpathians Foreland
AU: * Matenco, L
EM: liviu.matenco@falw.vu.nl
AF: Netherlands Centre for Integrated Solid Earth Sciences, Vrije Universiteit, Faculty of Earth and Life Sciences, De Boelelaan 1085, Amsterdam, 1081HV Netherlands
AU: Bertotti, G
AF: Netherlands Centre for Integrated Solid Earth Sciences, Vrije Universiteit, Faculty of Earth and Life Sciences, De Boelelaan 1085, Amsterdam, 1081HV Netherlands
AU: Cloetingh, S
AF: Netherlands Centre for Integrated Solid Earth Sciences, Vrije Universiteit, Faculty of Earth and Life Sciences, De Boelelaan 1085, Amsterdam, 1081HV Netherlands
AU: Marin, M
AF: Geologisch - Palaeontologisches Institut, University of Basel, Bernoullistr. 32, Basel, 4056 Switzerland
AU: Schmid, S
AF: Geologisch - Palaeontologisches Institut, University of Basel, Bernoullistr. 32, Basel, 4056 Switzerland
AU: Tarapoanca, M
AF: Institut Francais du Petrole, Direction Geologie-Geochimie, 1-4 Avenue de Bois-Preau, Paris Cedex, Rueil-Malmaison, 92852 France
AU: Dinu, C
AF: University of Bucharest, Faculty of Geology and Geophysics, 6 Traian Vuia str., Bucharest, 70139 Romania
AB: Post-collisional basin evolution studies demonstrate significant differential vertical motions along and across the Carpathians arc. On the overall, subsidence takes place in the SE foreland associated with coeval uplift of the neighbouring Carpathians orogenic wedge and the northern foredeep. These features are associated at lithospheric levels with coeval, late-stage slab-pull resulting from thermal re-equilibration of an inherited slab in a system locked during the Late Miocene collision. The apparent coincidence in time of these differential movements acting at all depth levels demonstrate a complex 3D mechanism accommodating coeval different types of deformation in localised places along the coupled orogen - foredeep - backarc basin. In this respect, intra-plate folding due to the Pliocene to Quaternary inversion of the locked Carpathians - foreland system appears to play a more important role than hitherto assumed. In the central-northern part of the East Carpathians this folding reflects a lithospheric wavelength, larger than the scale of the local system. In the southern part of the East Carpathians, the collision has favoured during the Pliocene - Quaternary significant crustal folding with km amplitudes both in subsidence taking place in the foreland and uplift in the adjacent thin-skinned units. In the back-arc domain, the differential vertical movements associated with the overall compressional stress regime in the corridor between the SE Carpathians foreland and the easternmost Pannonian basin suggest a significant role for a crustal folding mechanisms with large scale effects in the neotectonic, climate and surface processes, previously not taken into account. Analysis of the vertical movements amplitudes indicates a gradual decrease from kilometres magnitude in the Carpathians foreland to hundreds of meters near the Pannonian basin, with a time migration of the folding null-point.
DE: 8102 Continental contractional orogenic belts
DE: 8105 Continental margins and sedimentary basins
DE: 8107 Continental neotectonics
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting