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Large-scale facies architecture and events in the geological history of the Adriatic Carbonate Platform (CROSBI ID 545559)

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Vlahović, Igor ; Tišljar, Josip ; Velić, Ivo ; Matičec, Dubravko Large-scale facies architecture and events in the geological history of the Adriatic Carbonate Platform // 22nd IAS Meeting of Sedimentology - Opatija 2003: Abstracts BookZagreb / Vlahović, Igor (ur.). Zagreb: Institute of Geology, Zagreb, 2003. str. 215-215

Podaci o odgovornosti

Vlahović, Igor ; Tišljar, Josip ; Velić, Ivo ; Matičec, Dubravko

engleski

Large-scale facies architecture and events in the geological history of the Adriatic Carbonate Platform

The Adriatic Carbonate Platform (AdCP) is one of the largest Mesozoic carbonate platforms of the Perimediterranean region.The major part of it crops out in Croatia, but its relics can also be found in SW Slovenia (including a protruded part in NE Italy), SW Bosnia and Herzegovina and S Montenegro. Marginal parts of the AdCP cannot be studied in detail (the SE margin is covered by the Adriatic Sea, and the NW margin is tectonized and mostly covered by younger deposits). Even after the important tectonic reduction by Tertiary tectonics, relics of the AdCP still cover an area nearly 700 km long and 80-210 km wide.However, the estimated length is only partly correct - although this carbonate body seems quite narrow in the area of SE Croatia, Montenegro and Albania, relics of the Mesozoic carbonate platform can be continuously traced further SE towards Greece and Turkey. Therefore the complete length of a more or less united Mesozoic carbonate platform, might be estimated at more than 3, 000 km. Although the entire carbonate sequence outcropping in Croatia is very thick (in places more than 8, 000 m), covering a stratigraphic range from the Carboniferous to the Eocene, only deposits ranging from the top of the Lower Jurassic (Upper Lias) to the end of the Cretaceous can be attributed to the Adriatic Carbonate Platform s.str. Foundation of the AdCP can be divided into two parts: 1) From the Carboniferous to the Middle Triassic, the study area represented a part of the N margin of Gondwana, as part of the carbonate platform of the epeiric type. 2) During the Middle Triassic rifting a huge body, the Apulian Promontory or Adria Microplate, split from Gondwana, and presented a perfect foundation for formation of a spacious, isolated carbonate platform during Late Triassic and Early Jurassic. Separation of the AdCP from this huge united platform took place during the latest Early Jurassic, when a deep marine area connecting the Belluno Basin in the north, and the Ionnian basin in the south was formed, representing the first praecursor of the present Adriatic Sea. In this way new platforms were established: the Apulian and Apenninic platforms along the western margin, and the Adriatic Carbonate Platform along the eastern side of the trough. During the Mesozoic, the Adria Microplate gradually drifted towards the conditions resulted in deposition of a very thick sequence of pure carbonate rocks on all separated platforms. Contemporaneously to the separation of the platform in the Late Lias, the north, i.e.towards Laurasia. Steady subsidence, its intraoceanic position and favourable NE margin of the newly established AdCP emerged. The rest of the platform was characterised by continuous shallow-water deposition during the Middle Jurassic (within lagoons surrounded by ooid shoals). An important palaeogeographic event, controlled by synsedimentary tectonics, took place in the Kimmeridgian, when in the central part of the platform, isolated troughs characterised by temporary communication with the open sea were formed. Contemporaneously some areas along the SW margin emerged, and the NE margin was, after the long emergence, covered by the sea and partly drowned. By the beginning of the Tithonian, former intraplatform depressions were gradually filled by bioclasts prograding from the surrounding reefs, and finally covered by ooid shoals. The Tithonian is characterised by unification of the entire area into a vast shallow-water depositional area. Lower Cretaceous deposits are more or less characterised by stable shallow-water sedimentation throughout the AdCP area, predominantly with peritidal shallowing-upward cycles, and numerous short emersions in the Hauterivian and Barremian. An Early Aptian transgression resulted in regional establishment of somewhat deeper lagoonal environments characterised by a low sedimentation rate, while the Aptian-Albian transition records general forced regression and variable periods of regional emergence. After relatively uniform shallow-water deposition in the Albian, the transition to the Upper Cretaceous is characterised by general regressive trends and significant facies differentiation during the Cenomanian, as an introduction to the events connected with encroachment of the Apulian Promontory on Laurasia. E.g., although the major part of the AdCP was drowned near the Cenomanian-Turonian transition as a consequence of a global sea-level rise, some parts were contemporaneously finally emerged. The Upper Cretaceous is generally characterised by important changes in the platform palaeogeography, e.g.disintegration into blocks of different bathymetry, formation of carbonate ramps, irregular pattern of local emergences of variable duration and a general regressive trend - the end of the AdCP s.str. existence is marked by general latest Cretaceous emergence (its beginning was variable, mostly between the Late Cenomanian and the Santonian, but in places it started in the Early Cretaceous or as late as the Maastrichtian). The Palaeogene transgression (mostly Early Eocene, Palaeocene in some parts) was very irregular, covering an intense palaeorelief of karstified AdCP deposits, following formation of the foreland flysch basins. A carbonate succession that formed on carbonate ramps (from a few to 200 m thick) is characterised by general deepening, and was covered by marls and flysch deposits, as an introduction into the final uplift and formation of the Dinarides.

Adriatic Carbonate Platform; Jurassic; Cretaceous; peritidal shallowing-upward cycles; synsedimentary tectonics; Aptian-Albian regional emergences; global sea-level rise; flysch basins; Croatia

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Podaci o prilogu

215-215.

2003.

objavljeno

Podaci o matičnoj publikaciji

22nd IAS Meeting of Sedimentology - Opatija 2003: Abstracts BookZagreb

Vlahović, Igor

Zagreb: Institute of Geology, Zagreb

953-6907-05-4

Podaci o skupu

22nd IAS Meeting of Sedimentology -Opatija 2003

ostalo

17.09.2003-19.09.2003

Opatija, Hrvatska

Povezanost rada

Geologija