Maastrichtian to Palaeocene and Eocene pelagic carbonates on the island of Svetac (central Adriatic, Croatia)

Korbar, Tvrtko; Fuček, Ladislav; Fuček, Vlasta Premec; Oštrić, Nenad

doi:10.4154/gc.2020.07

Cited by 1 publication

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“…Following the breakup of Pangea in the middle Triassic [7][8][9], a long-lasting Adriatic carbonate platform was formed [10] and persisted into the Palaeogene [11]. Although the neritic environments existed during the Late Cretaceous to Palaeogene in the present-day island of Biševo (central Adriatic), the contemporaneous pelagic environments characterised the surrounding areas, thus forming a complex system of subtropical islands and embayments [12,13].…”

Section: Geographical and Geological Settingmentioning

confidence: 99%

Tectonic Influence on Speleogenesis of Sea Caves on Biševo Island (UNESCO Global Geopark Vis Archipelago, Adriatic Sea, Croatia)

Mišur¹,

Budić²,

Kurečić³

et al. 2021

Geosciences

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A geological and speleological investigation was conducted in the famous Blue Cave (Modra špilja) and the Monk Seal Cave (Medvidina špilja) on Biševo Island (Croatia) to promote the island’s geoheritage through the new Visitor Centre. The island is mainly composed of Cretaceous to Paleogene neritic carbonates, which form the bedrock, whereas parts of the island are covered with thin Quaternary sediments. The caves are of small dimensions and a simple layout, composed of the main channel and few shorter side channels, all positioned in the tidal zone. Thus, the caves are semi-submerged sea caves located along the coastline. The Blue Cave and the Monk Seal Cave developed within the bedrock limestones and dolostones, respectively, within a zone of left-lateral NNE–SSW striking strike-slip faults that belong to the Biševo fault system. Conjugated discontinuities within the carbonate bedrock indicate a specific strike-slip tectonic regime. Additionally, the host rocks were probably also deformed and fractured during the rise of salt diapirs that characterise this part of the Adriatic foreland. Tectonic and bedding discontinuities form the fragments of the host rock, that combined with the impacts of the strong southern waves, significantly influenced the genesis of the caves.

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