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Late Cretaceous synorogenic clastic sediments of the NW Dinarides (Croatia) (CROSBI ID 589642)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Lužar-Oberiter, Borna ; Aščić, Šimun ; Babić, Ljubomir Late Cretaceous synorogenic clastic sediments of the NW Dinarides (Croatia) // IMS-2012_Abstract_Book fuer CD / Missoni, Sigrid ; Gawlick, Hans-Juergen (ur.). 2012. str. 69-69

Podaci o odgovornosti

Lužar-Oberiter, Borna ; Aščić, Šimun ; Babić, Ljubomir

engleski

Late Cretaceous synorogenic clastic sediments of the NW Dinarides (Croatia)

The NW segment of the Dinarides presents an important element of the Alpine orogenic belt due to its proximity to major neighboring tectonic units, the Alps in the north and Tisza to the east. This Dinaride-Alpine-Tisza transitional area is characterized by considerable geological complexity resulting from a long-lasting Mesozoic to Cenozoic tectonic history. Isolated remnants of Late Cretaceous synorogenic clastic basins exposed in NW Croatia document an early phase of evolution of the NW Dinarides, heavily masked by Cenozoic deformation and displacement which essentially formed the modern Dinarides, as well as by the Neogene sedimentary cover of the Pannonian Basin. In the Senonian, following Early to early Late Cretaceous orogenic events, many parts of the Internal Dinarides and marginal parts of the External Dinarides underwent transgression and the establishment of deep-water sedimentation. A period of relative tectonic quiescence marked by widespread deposition of deep water Scaglia-type deposits in the Campanian was further followed by flysch deposition due to renewed tectonic activity affecting the Adria plate margin and neighboring Tisza-Dacia and the Eastern Austroalpine. The Late Cretaceous clastic sediments hold important information regarding the exposed terrains which once shaped the dynamically active Dinarides and their neighboring regions. Using framework petrography and heavy mineral associations of sandstones, together with nannoplankton biostratigraphy, our aim is to constrain the provenance of the Late Cretaceous clastic sediments in the NW Dinarides and to establish links among currently spatially separated exposures. Such information is essential for generating a palaeogeographic reconstruction of the NW Dinarides for the relevant time period. The basins were largely filled by carbonate detritus derived from neighboring carbonate platform areas and by siliciclastic detritus generated by the erosion of various, newly exposed tectonostratigraphic units. Data on siliciclastic detritus in the northern part of the studied area indicates that there existed a dominant contribution from metamorphic rocks in its easterly segment (Mt. Medvednica, Zagreb environs), while in coeval sediments situated to the west (Mt. Žumberak) there existed a substantial additional contribution from ophiolite sources. In the southern part of the studied area (surroundings of Kordun and Banovina region) we encounter largely comparable provenance signatures, with significant contributions from both metamorphic and ophiolitic sources. In the latest Cretaceous, the area of the NW Dinarides probably consisted of several, more or less coeval basins which could explain the encountered regional differences in provenance signatures. The basins were probably separated by structural highs consisting of tectonostratigraphic units representing parts of the Internal Dinarides which supplied a part of the detritus, largely the ophiolitic component. Meanwhile, a considerable portion of the metamorphic detritus derived from units of the neighboring Tisza-Dacia and the Eastern Austroalpine.

Cretaceous; synorogenic; sediments; Dinarides; Croatia

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Podaci o prilogu

69-69.

2012.

objavljeno

Podaci o matičnoj publikaciji

IMS-2012_Abstract_Book fuer CD

Missoni, Sigrid ; Gawlick, Hans-Juergen

Podaci o skupu

29th IAS Meeting of Sedimentology

poster

10.09.2012-13.09.2012

Schladming, Austrija

Povezanost rada

Geologija