Fluviokarst and classical karst: Examples from the Dinarics (Krk Island, Northern Adriatic, Croatia)

Benac, Čedomir and Juračić, Mladen and Matičec, Dubravko and Ružić, Igor and Pikelj, Kristina Fluviokarst and classical karst: Examples from the Dinarics (Krk Island, Northern Adriatic, Croatia). Geomorphology, 184. pp. 64-73. ISSN 0169-555X

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Abstract

In order to contribute to the debate on the role of fluvial erosion in the shaping of karst, two nearby areas with different karstic landscapes were compared. Areas A and B are located relatively close to each other on the southern side of the Krk Island (Adriatic Sea, Croatia). Both areas are composed of similar limestone with a very high CaCO3 content. Area A is a typical doline or polygonal type (“classical”) of karst with numerous dolines (up to 57/km2) covered with terra rossa (red soil) and Mediterranean maquis shrubland. Dolines are located in zones which correspond to the strike of the main geological structures. Dry karstic valleys are visible only on gently inclined coastal slopes bordering the karstic plateau. In contrast, area B is typical of a bare karst landscape with a strong (palaeo)fluvial imprint. The dolines are absent, and the bedrock is only sporadically covered with terra rossa. Palaeogene marls have been observed in a few elongated depressions and in the coastal zone of area B. Along steep coastal slopes, valleys (up to 460 m/km2) are cut into the carbonates. The traces of episodic surface flows are visible in some of these valleys, in contrast to the valleys in area A. Remnants of a disrupted ancient fluvial network are clearly visible on the elevated karstic plateau in area B. Differences in the recent morphology are attributed mainly to varying thicknesses of the Palaeogene impermeable marly cover, and the intensity of tectonics in the two areas.

Item Type: Article
Keywords: Classical karst Fluviokarst Coastal geomorphology Terra rossa Dinarics Adriatic Sea
Subjects: NATURAL SCIENCES > Geology > Geology and Paleontology
Divisions: Faculty of Science > Department of Geology
Publisher: Elsevier
Depositing User: Danica Vujičić
Date Deposited: 02 Jul 2015 10:31
Last Modified: 02 Jul 2015 10:31
URI: http://digre.pmf.unizg.hr/id/eprint/3628

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