Naslov
Volcano-sedimentary-evaporitic rocks from an aborted Triassic rift and Cretaceous to Palaeogene Adriatic Carbonate Platform successions: OAEs, K– Pg boundary and the Palaeocene platform top (central Dalmatian islands, Croatia)

Autori
Korbar, Tvrtko ; Belak, Mirko ; Fuček, Ladislav ; Španiček, Jelena ; Steuber, Thomas

Vrsta, podvrsta i kategorija rada
Poglavlja u knjigama, znanstveni

Knjiga
Sedimentary cover of the Adria and its surroundings: from aborted rifting in the central Adriatic to the post-collisional deposition in the Dinarides, the Southern Alps, and the Pannonian basin

Urednik/ci
Korbar, Tvrtko ; Kovačić, Marijan ; Vlahović, Igor

Izdavač
Hrvatsko geološko društvo (HGD)

Grad
Zagreb

Godina
2023

Raspon stranica
143-158

ISBN
978-953-6907-80-9

Ključne riječi
Adriatic carbonate platform ; Mesozoic ; Cretaceous ; anoxic events ; Paleogene

Sažetak
The central Adriatic Vis archipelago was in 2019 recognized as a UNESCO Global Geopark. The islands are characterized by the oldest and the youngest rocks in the Adriatic, owing to salt tectonics that characterize the area. Salt diapirs are the most prominent subsurface tectonic structures in the central part of the Adriatic, built of once deeply buried volcano-sedimentary-evaporitic rocks deposited during the middle Triassic rifting stage of the Adriatic microplate (Adria). The subtropical Adriatic Carbonate Platform (AdCP) existed during most of the Mesozoic in the central part of the then more spacious Adria. The NE part of the AdCP has been incorporated into the Dinarides fold-and-thrust belt during the Palaeogene while the SW part remained relatively undeformed within the Adriatic foreland, which is mostly covered by the Neogene clastic deposits and by the sea since the Holocene. The diapirs include complexes of various Triassic rocks, which in places uplifted, and even pierced, a few kilometres thick AdCP succession, e.g., Komiža Bay on the island of Vis. As a consequence, an up to 1500 m-thick succession of the Cretaceous shallow- water carbonates is exposed on the flanks of the Komiža diapir. While pre- and post-Aptian successions are characterized by monotonous peritidal cycles, the Lower Aptian is marked by prominent facies diversification because of the perturbations related to the onset of the Ocean Anoxic Event 1a (OAE 1a), and the upper part is characterized by a regional subaerial exposure. OAE 2 is only incompletely recorded within the Cenomanian–Turonian succession on the islands of Vis and Biševo, as a consequence of local emergence of the platform top during the event, that is followed by a relatively short period of deposition until the Coniacian, when the SW part of the AdCP emerged. In the NE part of the platform the deposition continued until the Maastrichtian, and in places even into the Palaeocene. Thus, the Cretaceous–Palaeogene (K–Pg) boundary event is recorded within rare successions deposited on tidal flats (Hvar island) or in inner-platform lagoons (Brač island), but there is still debate on the origin of the specific boundary layer. The AdCP top is characterized by a major subaerial exposure, during which distinct discontinuity surfaces have been formed, and it is unconformably overlain by diachronous Eocene Foraminiferal Limestones that were deposited on a distal ramp of the once migrating Dinaric foreland basin.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

Napomena
36th IAS Meeting of Sedimentology, Dubrovnik
(Croatia), June 12-16, 2023, Field Trip Guidebook

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