Geophysical Model of the Carpathian-Pannonian Lithosphere: Geological and Geophysical Data Analyses

book

English

This book illustrates the application of multidisciplinary data analysis to the Carpathian-Pannonian region and presents verification of a Complex model of the Carpathian-Pannonian lithosphere and new Tertiary development model by the recent data sets and geophysical data analyses. Besides the traditionally used geological (sedimentological and volcanological data) and geomorphological data (Remote Sensing), emphasis was laid on geodetic, grav/mag data, seismic, seismological and other geophysical data (magnetotelluric, heat flow, paleomagnetic etc.). All available geonomic (geologic, geodetic, geophysical, geomorphological) data were verified and unified on the basis of the same scale and in the Western Carpathians on the Remote Sensing data. At the same time a model of the Western Carpathian neotectonic blocks and a model of recent lithosphere is presented and the principal problems of the tectogenesis in the Western Carpathians are defined: the different and ambiguous interpretations of the structure, different criteria for modelling the tectogenesis, the relations between Late Alpine active faults, and relations between the Late Alpine faults and older tectonic systems and especially to presence of the possibility to solve position of such problematic unit - as Penninicum on the base of geophysical data. The Carpathians and eastern parts of the Alps started to occupy the region of the present Carpathians during the Early Miocene. The oceanic plate underlying the rCFB subducted south-Western-wards, later Western-wards, while the north-eastward and eastward migration velocity of the accreting plate boundary decreased through time. The slower subduction rate caused: a steeper dip of the subducting slab; the beginning of the Eggenburgian (22-19 Ma) and following duration of extension in the orogenic hinterland accompanied by the asthenosphere up-welling; the onset of the crustally derived volcanism above the risen asthenosphere and the younger mantle-derived volcanism, progressively less contaminated by the crustal material, all contemporaneous with a shortening in the Carpathian accretionary wedge. The subduction of the rCFB finally led, at the end of the Early Miocene, to a collision with the continental margin along the Westernmost part of the present Carpathian Arc. The subduction roll-back of the subducting slab of the rCFB under the advancing Inner Carpathians, the oblique closure of the basin, the progressive change of the subduction to collision from the Western to the east along the Carpathian Arc drove a scissors-like break-off of the subducting oceanic slab along the Western Carpathians. The break-off in the East Carpathians was driven by the weight of a subducting oceanic slab and buoyancy of the attached continental slab. The break-off started in the Western of the Carpathian Arc in the Early Miocene, ran along the arc to its present position in the bend area between the East and South Carpathians and separated the oceanic slab, that subducted passively under its own weight, from the European continental margin. The lateral propagation rate of the slab tear decreased with time. The break-off-related volcanism was synchronous with the final stages of the collision. The record of all dynamic processes in the lithosphere can be identified, described and verified by the geophysical methods and on the obtained results. In this publication of authors has gathered all important data and results gained during his 30 years praxis.

Geophysical Data; seimics, seismology, Grav/Mag Data; Recent vertical movements; Heat flow; subduction; roll back, break off; slab; collision; Carpathians; Pannonian Basin;

Pospíšil, L., Nemčok, M.

2010

15. 11. 2010

LAP Lambert Academic Publisning

Germany

978-3-8433-7227-5

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