Acta Geologica 40. (1997)

1. szám - R. Kemenci - M. Canović: Geologic setting of the Pre-Tertiary basement in Vojvodina (Yugoslavia) Part I.: The Tisza Mega-unit of North Vojvodina

303203 Acta Gcologica Hungarica Vol. 40/1 pp. 1-36 (1997) Geologic setting of the Pre-Tertiary basement in Vojvodina (Yugoslavia) Part I: The Tisza Mega-unit of North Vojvodina Ru2a Kemenci, Miruna íanovic "Nafta-Gas " Exploration Department, Novi Sad Using the database acquired by lithostratigraphic, biostratigraphic and petrographic analysis of borehole samples, information on horizontal and vertical facial extensions and the recognized general stratigraphic relations in the FruSka Gora and southern margins of the Pannonian Low, three major structural units are distinguished in the Pre-Tertiary Complex of Vojvodina. Their developments are important for the paleogeographic reconstruction of the Pre-Tertiary events: 1) The Tisza Mega-unit of North Vojvodina, 2) the Ophiolitic and Flysch Belts of Central and Southern Vojvodina, 3) the South Carpathian-Balkanian and Serbo-Macedonian Belts of south-eastern Vojvodina. Paleontological analyses indicate that the complete Mesozoic system is developed in the Pre-Terdary basement of the Pannonian Basin in Vojvodina. The Tertiary complex in Vojvodina, together with the Mesozoic formations is also underlain by crystalline schists and granitoids, to date interpreted as of Proterozoic and Paleozoic age, and by the recently recognized Younger Paleozoic rocks affected only by very low-grade metamorphic processes. This study will consist of two parts, the first dedicated to the geologic formations underlying the Tertiary in North Vojvodina, identified by their lithofacial and structural characteristics as part of the Tisza Mega-unit, the second part will deal with the southern part of Vojvodina. The Northern part of the Tisza Mega-unit in Vojvodina is made up of the Precambrianf?) or Cambrian HorgoS Series, composed of polymetamorphic paraseries with granitoids. In the southern part of North Vojvodina are developed the Mokrin Series. They are a metavolcanogenic-sedimentary association intruded by granodiorites with migmatites. The crystalline complex is overlain partly by Devonian-Lower Carboniferous metaclastics or by Permian continental clastites and volcanites, followed by Lower Triassic transgressive clastites and Middle and Upper Triassic (generally shallow-water) limestones. On the southern margin of the Tisza Unit, the crystalline basement is partly overlain by clastic-carbonate or flysch deposits of the Campanian-Maastrichtian. During Alpine tectogenesis, the granite-metamorphite complex with its Triassic cover was subjected to compressional folding and overthrusting in North Vojvodina. Key words: Vojvodina, Pre-Tertiary basement, wells, geologic formation, stratigraphic analysis, lithostructural units Introduction Within the region of Vojvodina, surface outcrops of crystalline and Mesozoic formations are found only on Vr§ac and FruSka Gora mountains (Fig. 1). Attracting the attention of many researchers, they were subject of investigations Addresses: R. Kemenci: YU-21000 Novi Sad, M. Dimitrijevica 2/a, Yugoslavia, M. Canovic: YU-11000 Beograd, Svetozara Markovica 69, Yugoslavia Received: 20 June, 1995 0236-5278/97/$ 5.00 © 1997 Akadi<miai Kiadó, Budapest

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