Geological mapping and reconstruction of geological setting of Skrad area in Gorski kotar : master’s thesis

Cilj ovog rada bio je istražiti geološku građu okolice Skrada na temelju površinskih geoloških podataka u mjerilu 1:20.000. Područje istraživanja izgrađuju naslage permske, trijaske i jurske starosti. Današnji strukturni odnosi između litostratigrafskih jedinica izuzetno su kompleksni, a uvjetovani su trima glavnim tektonskim fazama. Najstariju fazu obilježava navlačna tektonika kojom su alohtone naslage permske i trijaske starosti dovedene u strukturni položaj iznad autohtonih naslaga glavnog dolomita noričko–retske starosti te izmjene dolomita i vapnenaca donjo- i srednjejurske starosti. Nakon navlačne faze nastupila je faza ekstenzijske tektonike koja je razlomila navlaku, a ujedno i otkrila podinu navlake u tektonskom oknu u kanjonu potoka Jasle i Curak. Najmlađa tektonska faza obilježena je kompresijskom tektonikom koja je autohtoni noričko–retski dolomit dovela u strukturni položaj iznad donjojurskih karbonata. Uz geološku kartu u mjerilu 1:20.000 s pripadajućim profilima, načinjen je geološki 3D model i interaktivni GIS projekt koji pruža mogućnost dopune i korekcije podataka, kao i pregled svih podataka obuhvaćenih terenskim istraživanjima.Abstract: The goal of this thesis was to thoroughly investigate Skrad area based on surface data that were collected in the course of geological mapping in 1:20.000 scale. The research area is built out of clastic and carbonate deposits of Permian, Triassic and Jurassic age. The present-day structural relations between the litostratigraphic units are complex due to three tectonic phases. The oldest phase is characterised by thrust faulting that resulted in allochthonous (nappe) position of Permian and Triassic above autochthonous Triassic and Jurassic deposits. The second phase is characterised by extension accommodated by normal faulting, which resulted in breaking apart of the nappe contact and opening of tectonic window located in the canyon of Curak and Jasle streams. The last tectonic phase is characterised by reverse faulting which enabled uplift of the autochthonous Norian and Rethian Hauptdolomite in structural position above lower Jurassic carbonates. In this thesis, beside the geological map in 1:20.000 scale accompanied by geological cross-sections, the geological 3D model and interactive GIS project have been made, too. The latter provides a possibility to manipulate with collected data and also to incorporate new data from future studies