Abstract
In the Dinaridic Ophiolite Belt, small (m-scale) to large (km-scale) blocks of Middle to Upper Triassic, and Middle to Upper Jurassic, more or less silicified bedded limestone are widely present, both as parts of para-autochthonous successions and as redeposited blocks in ophiolitic mélanges. The studied, approximately 230-m-thick succession in the wider area of Zlatar Mountain, is one of the most important para-autochthonous sections in the Serbian part of the Dinaridic Ophiolite Belt. The succession is made up of an alternation of redeposited carbonate toe-of-slope deposits, sand to clay-sized siliciclastic rocks, hemipelagic mudstones and radiolarite–spongiolite basin facies. In the lower part of the sequence, the components of the siliciclastic beds were derived mostly from low- and medium-grade metamorphic rocks. Similar components, together with sand-sized fragments of ophiolitic rocks, were encountered in small amounts in some redeposited carbonate beds. The chronostratigraphic assignment of the succession is based mostly on foraminifers, but age-diagnostic radiolarians and other microfossil groups were also considered. In the lower part of the probably continuous succession, a Norian–Rhaetian assemblage was recognized; a Sinemurian–Pliensbachian assemblage was encountered up-section, whereas the upper part of the succession could be assigned to the Bajocian–Bathonian. Considering the paleogeographic reconstructions and the analogies of age-equivalent sections, the succession records the depositional history of the Bosnian Basin during the Late Triassic to Middle Jurassic period and may contribute to the understanding of the evolution of the Adriatic margin of the Neotethys Ocean in the transition interval from passive to active margin stages.
Highlights
◂Fig. 1 Locations of the Trijebinska Reka section and geology of the Sjenica area (SW Serbia, the Dinaridic Ophiolite Belt). a Geographic position of the Trijebinska Reka section in the southeastern part of Zlatar Mt. b Terranes of a part of the Balkan Peninsula (Karamata 2006; Karamata et al 2000; Gawlick et al 2017): SMU Serbian-Macedonian Unit, MVZ Main Vardar Zone, KBRU Kopaonik Block and the Ridge Unit, VZWB Vardar Zone Western Belt, JB Jadar Block, DIE Drina–Ivanjica Element, Dinaridic ophiolite belt (DOB) Dinaridic Ophiolite Belt, EBDMU East Bosnian–Durmitor Megaunit. c Geology of the wider surrounding of the town of Sjenica
Legend: 1 Alluvial, 2 Neogene sediments, 3 Ophiolitic mélange (3a peridotite and basite), 4 Middle to Upper Jurassic radiolarites with intercalated turbidites and mass transport deposits, 5 Lower Jurassic red limestone, 6 in general Upper Triassic massive and bedded limestones, 7 Middle Triassic limestone, 8a normal fault, 8b supposed fault, 8c erosional boundary, 9 localities: a Krš Gradac b Strmenica c Brajska reka, 10 Trijebinska Reka section
Evaluation of the microfossil assemblages led to the conclusion that the studied succession represents a long time-range from the Late Triassic to the Middle Jurassic
Summary
◂Fig. 1 Locations of the Trijebinska Reka section and geology of the Sjenica area (SW Serbia, the Dinaridic Ophiolite Belt). Investigations of the rock assemblage, which was first referred to as the “Diabas–Hornstein Formation” or “Diabashornsteinschichten” (e.g., Ampferer and Hammer 1918; Hammer 1923), began in Serbia before the 1920s, the focus of studies being its age-determination (Triassic or Jurassic). It was considered a normal volcanic-sedimentary formation and this opinion persisted for a long time (see in Dimitrijević et al 2003). Intensive studies were performed during the time of geological mapping for the Basic Geological Map of the SFRY (scale 1:100,000) between 1960 and 1990, when these deposits were called the “Diabase-Chert Formation” (e.g., Živaljević et al 1983)
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