Naslov
Spatial and Temporal Relations Between Upper Cretaceous Platform and Pelagic Carbonates of the Adriatic Carbonate Platform, Croatia
(Spatial and Temporal relations Between Upper Cretaceous Platform and Pelagic Carbonates of the adriatic Carbonate Platform, Croatia)

Autori
Cvetko Tešović, Blanka ; Gušić, Ivan ; Jelaska, Vladimir

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

Izvornik
The 1st SEPM Congress on Sedimentary Geology St. Pete Beach, Florida 1995, Congress Program and Abstracts / - : SEPM, Society for Sedimentary Geology, 1995, 42-43

Skup
The 1st SEPM Congress on Sedimentary Geology

Mjesto i datum
Saint Pete Beach (FL), Sjedinjene Američke Države, 13.08.1995. - 16.08.1995

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
platform carbonates; pelagic carbonates; Upper Cretaceous; Adriatic carbonate platform

Sažetak
During the Mesozoic, the southern part of the Apennine Peninsula (Apulia), the Istrian Peninsula, the Adriatic islands, and parts of the Outer Dinarides, all belonged to a single geotectonic unit - the Adriatic or Apulian plate. During the Early Jurassic, the Adriatic carbonate platform was established as an isolated intra-oceanic platform. The carbonate platform sedimentation continued into the Late Mesozoic or Early Paleogene within a wide array of depositional settings. Since the deposition took place mostly in very shallow water, even minor see level changes could significantly influence the patterns of platform sedimentation. Over most of the platform, two drowning events or pelagic episodes have been distingushed: 1) a relatively short-lived Late Cenomanian - Early Turonian drowning event, which temporarily submerged almost the entire carbonate platform below the euphotic zone ; and 2) a longer and more differentiated Late Santonian - Early Campanian drowning, which preferentially occurred in particular, tectonically predisposed settings. Although both events involved eustatic sea-level rise and oceanic anoxic events, their sedimentologic consequences were different. Within the Adriatic trough at the southwest margin of the platform pelagic sedimentation, which was initiated near the end of the Cenomanian, continued at least into the Santonian. Alternatively, some parts of the platform could have been completely exposed due to tectonic uplift (e.g., Cres Island) and thus capable of shedding debris. While the Middle Turonian phase of active platform margin growth resulted in extensive chaotic and slump deposits, the youngest (Coniacian - Santonian) part of the sequence contains only few and comparatively thin intercalation of slump deposits, indicating the existence of widespread nearby platform conditions. The fact that a quiet "pelagic rain" depositional regime predominated over slope depositional mechanisms in the trough, suggests that the second drowning event (Late Santonian - Campanian) played a role in unifying the pelagic regime within the trough. The pattern of Adriatic platform evolution is considerably more complex than previously thought.

Izvorni jezik
Engleski

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