Lacustrine basin to delta evolution in the Zagorje Basin,a Pannonian sub-basin (Late Miocene: Pontian,NW Croatia) |
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Authors: | Email author" target="_blank">Marijan?KovácicEmail author Jozica?Zupanic Ljubomir?Babic Davor?Vrsaljko Mirjana?Miknic Koraljka?Bakrac Ivan?Hecimovic Radovan?Avanic Mato?Brkic |
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Institution: | (1) Institute of Geology, Sachsova 2, 10.000 Zagreb, Croatia;(2) Institute of Mineralogy and Petrography, Faculty of Science, University of Zagreb, Horvatovac bb, 10.000 Zagreb, Croatia;(3) Institute of Geology and Paleontology, Faculty of Science, University of Zagreb, Kralja Zvonimira 8, 10.000 Zagreb, Croatia |
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Abstract: | Pontian deposits of the Zagorje Basin constitute a coarsening-upward succession, which reflects the infilling style of this Pannonian sub-basin, i.e. the progradation of clastic systems into the brackish lake. Six facies differentiated correspond to lake floor, channelled slope, distal and proximal pro-delta, distal and proximal mouth bars, and lagoon/bay to swamp and alluvial environments. The deposition in the mouth-bar area was dominated by frictional forces. The upper-stage plane-bed sands are the main mouth-bar facies, which is uncommon in the geological record. The main factors for the origin of such bars include an abundant sand supply by the high-energy fluvial system(s), low-energy of the receiving basin and shallow depositional depth. Prolonged, catastrophic floods generated sustained hyperpycnal flows, which bypassed the mouth-bar area and fed the slope/pro-delta. The high ratio between sediment supply and subsidence rate resulted in a fast moving progradational wave , which involved the entire SW Pannonian Basin, including the Zagorje Basin. |
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Keywords: | Lacustrine delta Friction-dominated effluent Mouth bars Pannonian Basin Zagorje Basin |
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