engleski

Tectonic setting of recently found gypsum deposits of Medvednica Mt. (Northwestern Croatia)

In this paper two newly discovered locations on Medvednica Mt. with gypsum and its structural-tectonic setting are described. 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. On the other location, in the upper flow of the Vidovec stream, gypsum is also found in the dolomite, which is in direct discordant contact with a black Palaeozoic metapelites. On the samples from both locations, the isotope analysis of sulphur was performed and 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 open marine area during the Upper Permian. Therefore, it can be indirectly concluded on the age of metamorphic rocks of the Medvednica Mt. Namely, gypsum occurs on both locations in non-metamorphic dolomites of the Upper Permian age.

gypsum; tectonics; stress; Medvednica Mt.; Upper Permian; Lower Triassic

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