Geomorphological Characteristics of the Slunj Plateau

Bočić, Neven (2009) Geomorphological Characteristics of the Slunj Plateau. Doctoral thesis, Faculty of Science > Department of Geography.

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Abstract

Region of the Slunj plateau is a part of the extensive Una-Korana plateau expanding between the Dinaric Mountainous System in the south-west and Pannonian Basin in the north-east. The researched region is elongated in the Dinaric direction, its area figures out at 336 km2, and its largest part is situated at the height of 250-400 m. The Korana River is the main flow and erosion basis of the largest part of the researched area. The oldest rocks are the Permian sandstones, and the whole area is for the most part made of the Mesozoic platform carbonate rocks, which are in places transgressively covered with lacustrine and alluvial deposits of the Miocene, Pliocene and Quaternary age. Main structures and faults stretch in the Dinaric direction. Under the influence of neotectonic movements and stress orientation change, fault routes are curved, and the right horizontal shift component has become more prominent. Local compression and extension zones were formed in that way. There was development of pop-up and pull-apart structures, which are expressed in the relief as secondary (positive and negative) morphostructures in the framework of the primary morphostructure – plateau. As to exogenous processes, karst and fluviokarst ones are most significant, and fluvial, fluvio-denudational and slope processes are of somewhat less significance. In geologic past, the periods of more intensive exogenous processes were most frequent during and after orogenetic processes, and were interrupted by transgression periods. Such many times repeated denudation periods could have led to the formation of an extensive plateau. In the post Miocene period, the relief development was significantly influenced by denudation of the Neogene’s clastic sediments and a gradual exhumation of carbonate bedrock. During that process, the karst relief area increased at the expense of the fluvio-denudational relief area. It resulted in development of numerous karst forms (dolines, grikes, uvalas), but also of karstified remnants of the surface paleohydrographic network (dry and blind valleys). In those conditions numerous caves developed (103 registered ones), where horizontal caves dominated, while pits mainly appeared in the regions of uplifted morphostructures. Neotectonic movements caused the uplifting of the whole area and compensatory cutting of the Korana River’s flow with the average cut depth of about 50 m. This value represents a recent altitude difference between the erosion basis and the largest part of the plateau.

Item Type: Thesis (Doctoral thesis)
Keywords: Dinaric Karst, exogenous geomorphology, relief evolution, speleogenesis, geomorphology, Croatia, karst, erosional surface, structural geomorphology, caves
Supervisor: Bognar, Andrija
Date: 2009
Number of Pages: 275
Subjects: NATURAL SCIENCES > Geography
Divisions: Faculty of Science > Department of Geography
Depositing User: Inja Cahun
Date Deposited: 10 Jul 2014 11:16
Last Modified: 07 Jun 2016 10:17
URI: http://digre.pmf.unizg.hr/id/eprint/2484

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