Department of General Geology and Geotourism

geotourism, sedimentology, regional geology, micropaleontology, dendrochronology, cartography, GIS, spatial modelling, geostatistics

Geotectonics, local and regional paleogeography

The paleogeographic maps are constructed using a plate tectonic model, which describes the relative motions between approximately 300 plates and terranes and generated as Intergraph design files and PostScript-Corel Draws files using computer software and databases. The plate tectonic model used is based on GPLATES, PLATES and PALEOMAP software. The plate tectonic reconstruction programs PLATES and PALEOMAP, generated palaeocontinental base maps. It takes tectonic features in the form of digitised data files, assembles those features in accordance with user specified rotation criteria. The maps illustrate the geodynamic evolution of Earrth from Precambrian to the present day, that is spreding. origin and closure of oceans continental collisions and supercontinets assembly.

The Carpathian is roconstructed using the global plate tectonic model. Th capathian terranes are linked to the lithostratigraphy of the various facies zones as well as occurrence of hydrocarbon source rocks. Several paleogeographic elements have been described: the Alpine Tethys, Magura Basin, Silesian Ridge, Severin-Moldavidic Basin and North European Platform. The uplifted and basinal zones were distinguished within the platform. The Baška-Inwałd Ridge and Pavlov Carbonate Platform belong to the uplifted elements, while Bachowice and Mikulov basins represent the basinal zones.The Alpine Tethys, which constitutes important paleogeographic elements of the future Outer Carpathians, developed as an oceanic basin during Jurassic as a result of the Pangea break-up. The NE part of the Alpine Tethys between Carpathian-Eastern Alpine terrane and North European Platform is known as Pieniny Magabasin. The NW part of this megabasin is Magura Basin (Figs 1, 2). This basin is separated by the Czorsztyn Ridge from the Pieniny Klippen Belt Basin. The Silesian Ridge is an uplifted area, originally part of the North European platform separating during Jurassic-Early Cretaceous times Magura Basin and the Severin-Moldavidic Basin (Figs 1, 2). It is known only from exotics and olistoliths occurring within the various allochthonous units of the Outer Carpathians. The shallow-water marine sedimentation prevailed on the Silesian Ridge during Late Jurassic and earliest Cretaceous times. The carbonate material was transported from the ridge toward the Severin-Moldavidic Basin. Severin-Moldavidic Basin developed within the North European Platform as rift and/or back-arc basin. Its basement is represented by the attenuated crust of the North European plate with perhaps incipient oceanic fragments. The sedimentary cover is represented by several sequences of Late Jurassic – Early Miocene age belonging recently to various tectonic units in Poland and Czech Republic. The large continental plate, amalgamated during Precambrian and Paleozoic times is known as the North European Platform. The Proterozoic, Vendian (Cadomian), Caledonian, and Variscan fragments occur within this platform. The southern part of the North European Platform, adjacent to the Alpine Tethys is known as Peritethys. The uplifted and basinal zones were distinguished within the platform. The Baška-Inwałd Ridge and Pavlov Carbonate Platform belong to the uplifted elements, while Bachowice and Mikulov basins represent the basinal zones. The carbonate material was transported from the uplifted zones toward the Severin-Moldavidic Basin during latest Jurassic-earliest Cretaceous times.

The reconstruction of Precambrin and Paleozoic Protocarpathians, their paleogeography and plate tectonic evolution is based on the Actually the Protocarpathian basement lays below thick Cretaceous and Paleogene flysch rocks cover of the Outer Carpathians and is not available for direct observations. The fragments of crystalline rocks were preserved, however, in Carpathian sandstones and conglomerates as grains of size between sandy fractions to 2m blocks in size. These fragments were derived from the uplifted Protocarpathian ridges and deposited in the deeper Carpathian basins . We expect that geochemical, petrological and geochemical analyses of crystalline rocks of the Carpathian basement will provide the results allowing assignment of the Protocarpathians to the paleogeographic elements existing during Paleozoic and Precambrian times; reconstruction of plate tectonic evolutionary processes of the Protocarpathian during Paleozoic times;answer to the question whether final consolidation of the Protocarpathian element is the result of Variscan orogeny or may be older orogenic episodes. The global palegeographic maps are also constructed to support the potential of Paleozoic rocks, especially Ordovician and Silurian shales rich in organic matter.