Naslov
Structural setting of the Kvarner area (Northern Adriatic)

Autori
Špelić, Marko ; Del Ben Anna

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

Izvornik
90° CONGRESSO DELLA SOCIETÀ GEOLOGICA ITALIANA / Carmina Bernardo, Innamorati Giulia, Petti Fabio Massimo, Zuccari Alessandro - Trst : Societe Geologica Italiana, 2021, 35-35

Skup
90° Congresso della Società Geologica Italiana

Mjesto i datum
Trst, Italija, 14.09.2021. - 15.09.2021

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
North Adriatic Sea, External Dinarides, structural style, Messinian, lineaments, canyons, clinoforms.

Sažetak
Several studies have described the geological setting of the Kvarner area (Northern Adriatic Sea) based on the outcropping sedimentary sequences. They are mainly represented by the Adriatic carbonate platform (AdCP) affected by the compressional/ transpressional deformation of the External Dinaric orogen, which produced both thin- and thick-skinned tectonics. In this study, we used an extensive 2D seismic, and well dataset initially acquired for hydrocarbon exploration of the Kvarner area. The 2D seismic lines were calibrated by the wells, which allowed us to reconstruct the connection between the tectonic structures of the offshore and onshore areas. In particular, the continuity of the main SE-Istrian anticlines and the northern Dalmatian Islands has been recognized and depicted by a time structural map of the base of the Plio-Quaternary sequence. These anticlines, originating from the pre-Messinian Dinaric thrust system, were reactivated by the post-Messinian transpressional tectonics, which produced positive flower structures. Between the anticlines, sharp valleys, canyons, and channels crossing the Kvarner offshore area outline two main low structural lineaments. They are partially incised during the Messinian and can be followed in Istria onshore for several kilometers. Messinian and post-Messinian erosional effects were influenced by the morphology of older tectonic structures produced by the Dinaric compressional phase and the more recent transpression. Fluvial-deltaic depositional systems fill the valleys with mainly clinoform geometry. Wells never calibrated this sedimentary sequence. Thus, we hypothesize a Plio-Quaternary or a Late Messinian age, related to the Lago-Mare Formation. The back-trusts seem to have been recently reactivated as strike-slip structure in the Rijeka city area and the Krk island (eastern Kvarner). The AdCP shows a gentle tilting toward the Apennine Chain in the western explored area, whose outermost front is situated more than 80 km to the west. This tilting re- activated older normal faults and is probably enhanced by an uplift of the Istria peninsula.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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