Naslov
Resedimented carbonates in the evolution of the Dinaric Foreland Basin in northern Dalmatia, Croatia

Autori
Gobo, Katarina ; Mrinjek, Ervin ; Ćosović, Vlasta

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
36th IAS Meeting of Sedimentology Abstracts book / Vlahović, Igor ; Matešić, Darko - Zagreb : Hrvatsko geološko društvo, 2023, 126-126

ISBN
978-953-6907-79-3

Skup
36th International Meeting of Sedimentology

Mjesto i datum
Dubrovnik, Hrvatska, 12.06.2023. - 16.06.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
calciclastic mass-transport deposits ; Korlat basin ; Novigrad basin

Sažetak
Resedimented carbonates constitute the bulk of the Dinaric Foreland Basin fill in northern Dalmatia, Croatia. The wedge-top basin comprises an array of asymmetrical sub-basins filled with the Promina Beds – a ~2000 m thick calciclastic succession of deep neritic to marginal-marine and alluvial deposits of middle Eocene to Oligocene age. These calciclastic sediments derive from redeposition of uplifted and eroded carbonates formed originally on the Adriatic Carbonate Platform during the Cretaceous, and intra-basinal carbonate ramps during the Eocene. Repetitive resedimentation phases involved carbonate debris of different age and grain size included in various transport and depositional mechanisms, resulting in diverse deposits over a relatively small area. The most conspicuous among these are mass-transport deposits (MTDs) that record subaqueous gravity processes in deep-marine and shallow-marine settings. Their features suggest that their transport direction was perpendicular to the southeast-trending structural lineaments. Most of them were triggered during the Bartonian and Priabonian, especially in the Korlat and Novigrad sub-basins which differ from others and from each other in resedimentation processes and host deposits. Specifically, the Korlat sub-basin is characterized by large limestone olistoliths and associated bipartite megabeds encased in deep neritic hyperpycnites. The origin of these blocks and gravity-flow deposits is attributed to major gravitational collapses of consolidated and unconsolidated sediments of Lutetian carbonate ramps, respectively. Contrarily, MTDs in the Novigrad sub-basin occur in offshore and offshore- transition strata and include calcilutite and calcarenite slumps, bioturbated conglomeratic slump-debrites with a “dough-like” appearance, and debrites deposited from debrisflows of variable competence. We suggest that these MTDs were triggered in fairly shallow water by a combined effect of strong earthquakes and sediment destabilisation due to pore water overpressure during forced regressions caused by sub-basin tectonic development. The results show that the integration of facies and microfacies analyses plays a crucial role in unraveling the intricate relationship between tectonics, sedimentation and relative sea-level changes.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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