Naslov
Cretaceous paleostress analysis of the Adriatic Carbonate Platform (AdCP)

Autori
Prtoljan, Božo ; Ivković, Željko ; Kratković, Ivan ; Markulin, Željko ; Gušić, Ivan

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

Izvornik
23nd IAS Meeting of sedimentology / Rui Pena dos Reis, Pedro Callapez and Pedro Dinis - Coimbra : International Association of sedimentologists, 2004

Skup
23rd meeting of sedimentology

Mjesto i datum
Coimbra, Portugal, 15.09.2004. - 17.09.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Jadranska karbonatna platforma; paleostres; slampovi; desikacije
(AdCP; paleostres; desikacion craks; slupms)

Sažetak
The Adriatic belt of the AdCP, or what is to-day the Adriatic zone of the External Dinarides, is largely built up of Upper Cretaceous platform limestones. They have variable thicknesses in different structural settings, and, in adition to that, a rather pronounced facies variability. By means of paleostress data analysis it was possible to distinguish three kinematic events, documented by their sedimentary signatures, including slumps, paleofissures, dessication cracks, polymictic fissure breccias (=neptunian dykes), etc. Also, the analysis of the paleostress data showed that the majority of present structures were imprinted upon the older (= Ladinian) structures ; those, in turn, were being subject to repeated movements and thus represented the origin of the later (= recent) structural units. During the Late Cretaceous, both types of kinematic deformations, i.e., the radial and the tangential ones, have been active in the Adriatic belt of the External Dinarides. The oldest, Cenomanian, movements were characterized by radial tectonics (= the D1 deformational event). The Cenomanian-Turonian transition was a more quiet phase, characterized by the deposition of a new type of limestone - pelagic micrite (probably as a result of global eustatic sea-level highstand, which temporarily drowned the AdCP) that leveled the pre-existing paleomorphology. The end of the Santonian represents a turning point in kinematic activity, i.e., the tangential tectonics predominates (= the D2 deformational event). It produced important plicate deformations within individual segments of the AdCP (the NW-SE striking folds of 10 m- to 100 m-sized amplitudes and kilometer-sized limbs). While in thus formed synclines the deposition of pelagic micrites again took place, in the elevated parts of the anticlines the sedimentation was locally interrupted or, alternatively, shallow-water deposition continued. By the end of the Campanian, and due to the tangential stress, bioclastic sediments filled up and leveled the depressions. At the same time, the sedimentation in the largest part of what is to-day the onshore zone of the External Dinarides came to an end.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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