Competition of deltaic feeder systems reflected by slope progradation: a high-resolution example from the Late Miocene-Pliocene, Drava Basin, Croatia

Abstract The thick Lake Pannon sedimentary record provides insights into the downdip and lateral development of stratigraphic surfaces through analysis basin-scale clinoform progradation. architecture from eastern part Drava Basin (Pannonian System) was interpreted to reflect base-level changes. A major downlap surface as a flooding event followed by rejuvenation slope progradation recognized on 2D seismic sections. Detailed 3D interpretation combined with well data revealed that large sigmoidal overlying small oblique sets one only apparently produce geometry maximum surface. Instead, mapping influence two competing systems arriving north northwest. Lateral switching sediment input, similar many recent deltaic systems. e.g., Danube Po rivers led variability surfaces, lithology, thickness, which resulted in non-uniform shelf-edge migration. These observations were supported forward modeling simulating different scenarios, generation depositional an apparent This study also implies potential pitfalls basin based scarce emphasizes role variations input controlling architecture.