Sedimentology of a Permian playa lake: the Boda Claystone Formation, Hungary

• Autorzy: Konrád Gyula , Sebe Krisztina , Halász Amadé , Babinszki Edit

Identyfikatory

DOI

10.2478/v10118-010-0002-1

• Języki publikacji: EN

Abstrakty

EN

The Upper Permian Boda Claystone Formation (BCF) in SW Hungary has been previously been identified as a saline lake deposit. A country-wide screening found this 800-1000 m thick succession the most suitable for the disposal of high-level radioactive waste in Hungary, and research into this formation has consequently been intensified since. The investigations included a detailed study of the sedimentological characteristics. Data obtained by mapping of the 25 km2 outcrop area of the formation and from more than 40 boreholes were processed. The sedimentary structures were investigated on outcrop to microscopic scales, and cycles in the succession were interpreted. The main lithofacies, sedimentary structures and ichnofossils are presented. They indicate that the major part of the succession was deposited in a playa mudflat and is not of lacustrine origin in a strict sense. The lake sediments are represented by laminated and ripple-marked/flaser-type cross-laminated claystones and siltstones and by massive dolomites; trace fossils include crawling traces and burrows. Partial or complete drying out of the lake commonly occurred after the formation of carbonate mud by evaporation. Periodic fluvial influx is recorded by cross-bedded sandstones and unsorted gravelly sandstones of up to pebble-sized angular grains. Fenestral and stromatolitic structures reflect the repeated appearance of playa mudflat conditions. The silty claystones, which compose the major part of the succession, lost their primary structures due to pedogenic processes and indicate prolonged subaerial intervals with soil formation and only ephemeral inundations. The presence of pedogenic carbonate concretions supports the interpretation of an arid climate and a relatively shallow groundwater table. Drying-out events shown by desiccation cracks and authigenic breccias can be traced all over the succession. The various facies form small-scale sedimentary cycles showing a shallowing-upward trend and the growing influence of aridity and subaerial exposure.

Słowa kluczowe

EN

Late Permian; Boda Claystone Formation; Hungary; playa

PL

późny Perm; Węgry

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2010
• Tom: Vol. 16, No. 1
• Strony: 27--41
• Opis fizyczny: Bibliogr. 23 poz.

Twórcy

autor

Konrád Gyula

• Department of Geology, University of Pécs, 7634 Pécs, Ifjúság ú. 6., Hungary

autor

Sebe Krisztina

• Department of Geology, University of Pécs, 7634 Pécs, Ifjúság ú. 6., Hungary

autor

Halász Amadé

• Institute of Environmental Science, University of Pécs, 7634 Pécs, Ifjúság ú. 6., Hungary

autor

Babinszki Edit

• Geological Institute of Hungary, Budapest, 1143 Budapest, Stefánia út 14., Hungary

Bibliografia

• Árkai, P., Balogh, K., Demény, A., Fórizs, I., Nagy, G. & Máthé, Z., 2000. Composition, diagenetic and post-diagenetic alterations of a possibile radioactive waste repository site: the Boda Albitic Claystone Formation, southern Hungary. Acta Geologica Hungarica 43, 351-378.
• Barabás-Stuhl Á., 1981. Microflora of the Permian and Lower Triassic sediments of the Mecsek Mountains (South Hungary). Acta Geologica Hungarica 24, 49-97.
• Barabás, A. & Barabásné Stuhl, Á., 1998. A Mecsek és környéke perm képződményeinek rétegtana [Stratigraphy of Permian formations of the Mecsek Mts. and their surroundings]. [In:] Bérczi, I. & Jámbor, Á. (Eds): Magyarország képződményeinek rétegtana. MOL Rt. - MÁFI, Budapest, 187-215.
• Buatois, L.A. & Mángano, M.G., 2004. Animal B substrate interactions in freshwater environments: applications of ichnology in facies and sequence stratigraphic analysis of fluvio-lacustrine succession [In:] McIlroy, D. (Ed.): The application of ichnology to palaeoenvironmental and stratigraphic analysis. Geological Society of London Special Publication 228, 311-333.
• Csontos, L. & Vörös, A., 2004. Mesozoic plate tectonic reconstruction of the Carpathian region. Palaeogeography, Palaeoclimatology, Palaeoecology 210, 1-56.
• Fazekas, V., Majoros, Gy. & Szederkényi, T., 1981. Late Paleozoic subsequent vulcanism of Hungary. Newsletter of IGCP Project No 5 3 (Padova).
• Fülöp J., 1994. Magyarország geológiája. Paleozoikum II. [Geology of Hungary. Paleozoic II.]. Akadémiai Kiadó, Budapest, 447 pp.
• Haas, J. & Péró, Cs., 2004. Mesozoic evolution of the Tisza Mega-unit. International Journal of Earth Sciences 93, 297-313.
• Hámos, G., Majoros, Gy., Máthé, Z. 1996. The geology of Boda site, Hungary. Surface and URL based investigations. TOPSEAL ’96 Transactions II, Stockholm, 196-199.
• Jámbor, Á., 1964. A Mecsek hegység alsópermi képződményei [The Early Permian formations of the Mecsek Mts.]. Mecsekérc Ltd. Archives, Pécs, 127 pp.
• Konrád, Gy. & Hámos, G., 2006. A magyarországi nagy aktivitású radioaktív hulladéktároló telephely kijelölésének földtani szempontjai és az eddigi kutatások eredményei [Geological aspects of determining high Sedimentology of a Permian playa lake: the Boda Claystone Formation, Hungary 41 activity radioactive waste depository sites in Hungary and the results of the recent research.]. Acta Geographica, Geologica et Meteorologica 1, 33-39.
• Konrád, Gy., 1999. The Boda Claystone Formation. - ’The Geology of today for tomorrow’. Excursion Guide Book (A satellite conference of the World Conference of Science, Budapest), 65-75.
• Kovács, L., Hámos, G. & Csicsák, J., 2000. Actual state of the site characterisation programme of the Boda Siltstone Formation. Bulletin of the Hungarian Geological Society 130, 197-206.
• Majoros, Gy. (Ed.), 1999. Nagy léptékű földtani vizs- vizsgálatok, regionális tektonikai és szedimentológiai modell kidolgozása. A Bodai Aleurolit Formáció minősítésének Rövidtávú Programja [Large-scale geological studies, elaboration of a regional tectonic and sedimentological model] Final report of the Short-term Investigation Program of the Boda Siltstone Formation 2. Mecsekérc Ltd. Archives, Pécs, 100 pp.
• Máthé, Z. (Ed.), 1999. Ásvány-kőzettani, kőzetgeokémiai és izotóptranszport vizsgálatok [Mineralogical, petrographical, rock geochemical and isotope transport studies]. Final report of the Short-term Investigation Program of the Boda Siltstone Formation 4. Mecsekérc Ltd. Archives, Pécs, 153 pp.
• McCann, T., Kiersnowski, H., Krainer, K., Vozárová A, Peryt, T., Oplustil, S., Stollhofen, H., Schneider, J., Wetzel, A., Boulvain, F., Dusar, M., Török Á., Haas J., Tait, J. & Körner, F., 2008. Permian. In: McCann, T. (Ed.): The Geology of Central Europe, Vol. 1: Precambrian and Paleozoic. Geological Society, London, pp. 531-598.
• Németh, T., Horváth, P. & Judik, K., 2005. Az Ibafa-4 számú fúrás alaphegységi képződményeinek ásvány-kőzettani vizsgálatai (I. csomag) [Mineralogical and petrographical investigations of the basement rocks of the borehole Ibafa-4, Package I] Mecsekérc Ltd. Archives, 137 pp.
• Pemberton, S.G., MacEachern, J.A. & Frey, R.W., 1992. Trace fossil facies models: environmental and allostratigraphic significance. [In:] Walker, R.G. & James, N.P. (Eds): Facies models - Response to sea level change. Geological Association of Canada, 47-72.
• Schneider, J., Körner, F., Roscher, M. & Kroner, U., 2006. Permian climate development in the northern peri-Tethys area - the Lodève basin, French Massif Central, compared in a European and global context. Palaeogeography, Palaeoclimatology, Palaeoecology 240, 161-183.
• Torell, O.M., 1870. Petrificata suecana formationis cambricae. Acta Universitatis Lundensis (Lunds Universit Årsskrift) 2, 1-14.
• Varga, A.R., Szakmány, Gy., Raucsik, B. & Máthé, Z., 2005. Chemical composition, provenance and early diagenetic processes of playa lake deposits from the Boda Siltstone Formation (Upper Permian), SW Hungary. Acta Geologica Hungarica 48, 49-68.
• Vozárová, A., Ebner, F., Kovács, S., Kräutner, H-G., Szederkényi, T., Kristić, B, Sremac, J., Aljinovič, D., Novak, M & Skaberne, D., 2009. Late Variscan (Carboniferous to Permian) environments in the Circum Pannonian Region. Geologica Carpathica 60, 71-104.
• Weedon, G., 2003. Time-series analysis and cyclostratigraphy. Cambridge University Press, Cambridge, 259 pp.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).