TY - JOUR AU - Di Stefano, P AU - Galácz, András AU - Mallarino, Gianni AU - Mindszenty, Andrea AU - Vörös, Attila TI - Birth and early evolution of a jurassic escarpment: Monte Kumeta, Western Sicily JF - FACIES J2 - FACIES VL - 46 PY - 2002 IS - 46 SP - 273 EP - 298 PG - 26 SN - 0172-9179 DO - 10.1007/BF02668084 UR - https://m2.mtmt.hu/api/publication/1021666 ID - 1021666 N1 - Dipartimento di Geologia e Geodesia, Università di Palermo, Via Archirafi 22-1-90123, Palermo, Italy Department of Paleontology, Eotvos Lorand University, H-1117 Budapest, Hungary Pázmány Péter Sétány 1/C, Hungary Dipartimento di Geologia e Geodesia, Università di Palermo, Via Archirafi 22, 1-90123 Palermo, Italy Department of Applied and Environmental Geology, Eotvos Lorand University, H-1117 Budapest, Hungary Department of Geology and Paleontology, Hungarian Natural History Museum, P.O. Box 147, h-1431 Budapes, Hungary Cited By :61 Export Date: 2 January 2023 Correspondence Address: Di Stefano, P.; Dipartimento de Geologia e Geodesia, Via Archirafi 22, Palermo I-90123, Italy; email: pdistefa@unipa.it AB - The accurate reconstruction of the facies architecture in the Jurassic succession of Monte Kumeta, coupled with a detailed biostratigraphy, allow to define dynamics and genetic factors controlling the conversion of a Bahamian-type carbonate platform to a pelagic escarpment. A change from tidalites to oolites i.e. from the restricted, interior lagoon to a more open-marine sandy depositional environment, records the establishment of a basin south of the Monte Kumeta sector in late Hettangian-Sinemurian times. The oolitic limestones are overlain by earliest Carixian bioclastic grainstones and packstones with micritized grains and by wackestones with radiolarians and sponge spicules, organized in thin sand prisms. The decrease of carbonate productivity indicated by these sediments records the dissection of the platform and the subsequent isolation of a submarine topographic high in the Monte Kumeta sector. Though based only on indirect evidence, it is suggested that a tectonically controlled scarp must have existed between the Monte Kumeta "high" and the basin. Progressive northward retreat of this scarp resulted in the conversion of a shallow platform sector into a gradually steepening slope, along which the distribution of sediments was controlled by repeated tectonic and gravity-induced modifications of the topography of the substrate. Vertical and lateral changes and geometrical relationships of the recognized lithofacies suggest that they were deposited on a stepped surface brought about mainly by, repeatedly reactivated basin ward dipping normal faults. This scenario is clearly reflected by the relationship of platform strata and the overlying encrinites of Carixian/ Domerian age. The encrinite bodies show again a prismatic geometry, becoming thicker towards the south and filling the first generation of neptunian dykes. The top of the encrinites is marked by a peculiar jagged dissolution surface with dm-scale pinnacles capped by a thick ferromanganese crust. The formation of this peculiar surface could have been controlled by complex changes in water chemistry probably related to the Early Toarcian anoxic event. The crust itself is dissected by faults of decimetres to metres of throw, sometimes organized into small- scale positive flower structures. In the hollows/depressions of this highly articulated substrate pelagic sediments of Bajocian to Oxfordian age were deposited. They display a clearly onlapping relationship to the encrinites and to the carbonate platform beds. Their thickness rarely exceeds 4 to 5 meters and they are present also as neptunian dykes filling a dense network of fissures. During Late Callovian and Oxfordian times synsedimentary tectonics has intensified resulting in an increase of the inclination of the slope. This led to more and more abundant, gravitationally controlled deformations (slumping and sliding) of semi-lithified and unlithified sediments along the Monte Kumeta escarpment. LA - English DB - MTMT ER - TY - JOUR AU - Török, Ákos TI - Formation of dolomite mottling in Middle Triassic ramp carbonates (Southern Hungary) JF - SEDIMENTARY GEOLOGY J2 - SEDIMENT GEOL VL - 131 PY - 2000 IS - 3-4 SP - 131 EP - 145 PG - 15 SN - 0037-0738 DO - 10.1016/S0037-0738(99)00137-2 UR - https://m2.mtmt.hu/api/publication/1635943 ID - 1635943 N1 - Cited By :17 Export Date: 15 June 2021 Correspondence Address: Torok, A.; Department of Engineering Geology, , H-1521 Budapest, Hungary; email: torok@bigmac.eik.bme.hu Funding details: Hungarian Scientific Research Fund, OTKA, F026401 Funding details: Országos Muszaki Fejlesztési Bizottság, OMFB Funding text 1: P. Frykman, E. Nygaard, C.K. Claussen (Geological Survey of Denmark), B. Sellwood, V.P. Wright (Postgraduate Research Institute for Sedimentology, Reading University) provided much help during my stays in Denmark and the UK and ensured technical facilities. The enormous work of C. Braithwaite and P. Muchez in correcting the manuscript, their useful comments and suggestions are very much appreciated. The critical review of H. Qing has also improved the quality of the paper. I am grateful to A. Demény and A. Mindszenty for consultations. Technical help of E. Horthy, Cs. Péró and E. Sasköi is appreciated. A mobility grant was given by the Széchenyi Foundation to the University of Reading. Financial support was partly provided by Hungarian Scientific Research Foundation (OTKA, F026401) and by OMFB. LA - English DB - MTMT ER - TY - JOUR AU - Török, Ákos TI - Controls on development of Mid-Triassic ramps: examples from southern Hungary JF - GEOLOGICAL SOCIETY SPECIAL PUBLICATIONS J2 - GEOL SOC SPEC PUBL VL - 149 PY - 1998 SP - 339 EP - 367 PG - 29 SN - 0305-8719 DO - 10.1144/GSL.SP.1999.149.01.16 UR - https://m2.mtmt.hu/api/publication/1635999 ID - 1635999 N1 - Cited By :41 Export Date: 15 June 2021 Correspondence Address: Török, Á.; Department of Geology, Sztoczek u. 2, H-1521 Budapest, Hungary; email: torok@bigmac.eik.bme.hu AB - During Mid-Triassic time the palaeogeographical-tectonic setting of the northern Tethyan passive margin and epicontinental basins favoured the ramp morphology, as broad flat areas were available for flooding and establishment of carbonate sedimentation. Throughout this time, in what is now southern Hungary, homoclinal ramps developed, which also exhibit some evidence of partial distal steepening. The nearly 1 km thick Anisian-Ladinian Muschelkalk carbonates are grouped into six depositional units. In each ramp unit facies types were identified representing coastal sabkhas, inner ramp peritidal facies, backshoal lagoons, oolite shoals, storm to fair-weather influenced mid-ramps, proximal to distal shell beds and low-energy outer ramps. Mid- and inner ramp carbonates make up the majority of the successions. The deepest outer ramp facies correspond to the peak transgression of a second-order Triassic sea-level rise. In the Hungarian Muschelkalk three major transgressive-regressive sequences were identified. In Germany, Poland and Spain much thinner and slightly coarser Muschelkalk carbonate successions were formed in the same Mid-Triassic interval. The major sediment redistribution processes were related to storms that generated coquinas, and mud flow deposits. Slow, early diagenesis and the predominance of unstable muddy substrate led to the formation of small-scale slumps, slides and plastic deformation. The fauna reflects the prevalence of carbonate mud and temporarily high-stress conditions. A non 'cool water' origin of this ramp is inferred from the presence of evaporites, early dolomization of inner ramp carbonates, the biota and the palaeogeographical setting. The major controlling factors of Mid-Triassic ramps were the gentle antecedent morphology, the subtropical climate, the high production of carbonate mud and the lack of reef-building organisms, as well as the passive margin setting, which resulted in a moderate and relatively uniform subsidence rate over a wide area. LA - English DB - MTMT ER - TY - JOUR AU - Török, Ákos TI - Dolomitization and karst-related dedolomitzation of Muschelkalk carbonates, in South Hungary JF - ACTA GEOLOGICA HUNGARICA: A QUARTERLY OF THE HUNGARIAN ACADEMY OF SCIENCES J2 - ACTA GEOL HUNG VL - 40 PY - 1997 IS - 4 SP - 441 EP - 462 PG - 22 SN - 0236-5278 UR - https://m2.mtmt.hu/api/publication/1635954 ID - 1635954 N1 - Budapest Technical University, Department of Engineering Geology, Hungary Sztoczek u. 2, H-1521 Budapest, Hungary Cited By :6 Export Date: 15 June 2021 Correspondence Address: Török, Á.Sztoczek u. 2, H-1521 Budapest, Hungary; email: torok@bigmac.eik.bme.hu Budapest Technical University, Department of Engineering Geology, Hungary Sztoczek u. 2, H-1521 Budapest, Hungary Cited By :6 Export Date: 18 June 2021 Correspondence Address: Török, Á.Sztoczek u. 2, H-1521 Budapest, Hungary; email: torok@bigmac.eik.bme.hu LA - English DB - MTMT ER - TY - CHAP AU - Török, Ákos ED - Hagdorn, H ED - Seilacher, A TI - Storm Influenced Sedimentation in the Hungarian Muschelkalk T2 - Muschelkalk PB - Goldschneck CY - Stuttgart SN - 3926129115 T3 - Sonderbände der Gesellschaft für Naturkunde in Württemberg ; 2. PY - 1993 SP - 133 EP - 142 PG - 10 UR - https://m2.mtmt.hu/api/publication/1636000 ID - 1636000 LA - English DB - MTMT ER -