Original scientific paper
Tectonic setting of recently found gypsum deposits of Mt. Medvednica (Northwestern Croatia)
D. Jamičić
Da. Slovenec
Abstract
In this paper two newly discovered locations with gypsum on Mt. Medvednica and the structural-tectonic setting are described. The first location with gypsum is situated 2 km S of Marija Bistrica and is associated with dolomites and clastic rocks of Permo-Triassic age, which were during the most recent Neotectonic events, together with Miocene sediments, intensely folded and reverse faulted under the influence of the main stress, oriented N-W. At the other location, in the upper course of the Vidovec stream, gypsum is also found in dolomite, which is in direct discordant contact with black Palaeozoic metapelites. On samples from both locations, sulphur isotope analysis was performed and an Upper Perm to Lower Triassic age was determined. Based on the results of the sulphur analysis it is assumed that investigated localities were connected with an open marine area during the Upper Permian. Therefore, and indirect conclusion concerning the age of the metamorphic rocks of Mt. Medvednica can be made. That is, gypsum occurs in both locations in non-metamorphic dolomites of the Upper Permian age.
Keywords
gypsum; tectonics; stress; Mt. Medvednica; Upper Permian; Lower Triassic
Hrčak ID:
11480
URI
Publication date:
31.3.2002.
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