Miocene fan delta conglomerates in the north-western part of the Danube Basin: provenance, paleoenvironment, paleotransport and depositional mechanisms

• Published in: Geologica Carpathica Vol. 69; no. 5; pp. 467 - 482
• Main Authors: Csibri, Tamás, Rybár, Samuel, Šarinová, Katarína, Jamrich, Michal, Sliva, Ľubomír, Kováč, Michal
• Format: Journal Article
• Language: English
• Published: Bratislava Sciendo 01.10.2018; Earth Science Institute, Slovak Academy of Sciences; Earth Science Institute, Slovak Academy of Sciences, Slovakia
• Subjects: Basins; Blatné Depression; Carbonates; Cenozoic; Composition; Conglomerates; Danube Basin; Erosion; fan delta; Geologic depressions; Hanging walls; lower/middle Miocene; Metamorphic rocks; Miocene; Provenance; Rifting; sedimentary petrology
• ISSN: 1336-8052; 1335-0552; 1336-8052
• DOI: 10.1515/geoca-2018-0027

The Blatné Depression located in the NW part of the Danube Basin represents the northernmost sub-basins of the Pannonian Basin System. Its subsidence is associated with oblique collision of the Central Western Carpathians with the European platform, followed by the back-arc basin rifting stage in the Pannonian domain. The conglomerates recognized in the Cífer-2 well document the latest Burdigalian–early Langhian deposition in fan delta lobes situated above the footwall and hanging wall of a WSW–ENE trending fault system, the activity of which preceded the opening of the late Langhian–Serravallian accommodation space with a NE–SW direction. The provenance area of the “Cífer conglomerate” was linked to the Tatric Super-unit complexes. Similar rocks crop out in the southern part of the Malé Karpaty Mts. and are also present in the pre-Cenozoic basement of the Danube Basin. Documented extensive erosion of the crystalline basement and its sedimentary cover lasted until the early/middle Miocene boundary. The “Cífer conglomerate” has distinct clast composition. The basal part consists of poorly sorted conglomerate with sub-angular clasts of metamorphic rocks. Toward the overlying strata, the clasts consist of poorly sorted conglomerates with sub-rounded to well-rounded carbonates and granitoids. The uppermost part consists of poorly sorted conglomerates with sub-rounded to rounded clasts of carbonate, granitoid and metamorphic rock. Within the studied samples a transition from clast to matrix supported conglomerates was observed.