A Method for Lithogenetic Subdivision of Pannonian (s. l.) Sedimentary Rocks
Published:January 01, 1988
Á. Szalay, K. Szentgyörgyi, 1988. "A Method for Lithogenetic Subdivision of Pannonian (s. l.) Sedimentary Rocks", The Pannonian Basin: A Study in Basin Evolution, Leigh H. Royden, Ferenc Horváth
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A method is presented here for subdividing the Neogene sedimentary rocks of the Pannonian basin based on the fact that these Neogene sediments are made up almost exclusively of pelite and psammite. The alternation of pelitic and psammitic layers and their thicknesses are known from geophysical well logs. We construct lithologic trend diagrams for several drill holes, and for each drill hole we obtain a characteristic trend diagram. Changes in lithologic trends can be used to define lithogenetic units, which may be used as a basis for subdividing the Pannonian strata. Similar lithologic trend diagrams from neighboring boreholes allow for local correlation of lithogenetic units. This correlation has been extended to a regional system of lithogenetic units through analysis of many lithogenetic trend curves and reflection seismic sections.
The Pannonian (s. 1.) complex of the Great Hungarian Plain was divided into (from deepest to shallowest) units . The lowermost units can be shown to occur only in the deep basin areas where sedimentation was probably uninterrupted from Sarmatian to Quaternary time.
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The Pannonian Basin: A Study in Basin Evolution
The Pannonian basin system is an integrap part of the Alpine mountain belts of east-central Europe. It is completely encircled by the Carpathian Mountains to the north and east, the Dinaric Alps to the south, and the Southern and Eastern Alps to the west. In 1912, Kober defined the Pannonian basin as one of the type “Zwischengebirge,” a relatively un-deformed region characterized by block faulting and situated between externally vergent thrust belts. More recent studies using subsurface data have shown that the Pannonian area was extensively deformed by Mesozoic thrusting and subsequently disrupted by a complex system of Cenozoic normal and wrench faults. Thus, the Pannonian “massif” has undergone several types of deformation, which are partly hidden by a thick sequence of sedimentary rocks of Neogene-Quaternary age. The Pannonian basin is actually a system of small, deep basins separated by relatively shallow basement blocks. The Neogene-Quaternary sedimentary rocks exceed 7 km in thickness in some areas, and the basin system (including the Transylvanian basin) is about 400 km from north to south and 800 km from east to west. It is currently interpreted by most workers as a Mediterranean back arc extensional basin of the middle Miocene age. The Carpathians, Eastern Alps, and Dinarides, which surround the Pannonian basin, are the result of Mesozoic and Cenozoic continental collision between Europe and several continental fragments to the south, including Africa. Thrusting was direted outward from the present Pannonian basin toward the European platform and the Adriatic region. In all the orogenic belts, the interior parts of the thrust belts were deformed in Mesozoic time, while the outer parts were deformed in Tertiary time. The volume presents 26 papers and eight regional maps resulting from a joint five-day symposium held in Veszprem, Hungary, in 1982 entitled “Evolution of Extensional Basins within Regions of Compression with Emphasis on the Intra-Carpathian Region.” The symposium was sponsored jointly by the Hungarian Oil and Gas Trust, the Hungarian Geological Survey, and the U.S. National Science Foundation.