Structure and the Age of Conglomerates of Mount Southern Demerdzhi Based on the First U/Pb Dating of Detrital Zircons (Upper Jurassic, Crimean Mountains)
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U/Pb-isotope dating of detrital zircons from conglomerates of the reference section of the Demerdzhi Formation on the western slope of Mount Southern Demerdzhi was carried out. A cluster of the five youngest, reliably dated zircons with an average age of 154.1 ± 0.73 Ma was revealed, which indicates that the formation of conglomerates overlying the studied layer began to form not earlier than in the Late Kimmeridgian. The dating obtained forces us to reconsider the age of the Demerdzhi Formation, which was previously specified as Oxfordian–Early Kimmeridgian. New data on the age of thecoarse-grained sedimentary rocks of the Crimean Mountains advance concepts about Late Jurassic Cimmerian tectonic activity on the northern Tethys margin.
The laboratory studies were carried out at the Australian Research Council Centre of Excellence for Core to Crust Fluid Systems/GEMOC (Sidney, Australia) with the use of equipment supported by DEST Systemic Infrastructure Grants, ARC LIEF, NCRIS/AuScope, industry partner of the Macquarie University. Publication no. 817 ARC/CCFS Centre (http://www.ccfs.mq.edu.au) and no. 1082 GEMOC (http://www.gemoc.mq.edu.au); the sampling of the rock material and preparation for analytical study were supported by the Russian Science Foundation, project no. 15-05-08767. Synthesis of the materials on the Northern Black Sea Region was carried out according to the scientific program, project no. 2330, Ministry of Education and Science of the Russian Federation.
- 2.V. S. Mileev, E. Yu. Baraboshkin, S. B. Rozanov, and M. A. Rogov, Byull. Mosk. O-va Ispyt. Prir., Otd. Geol. 81 (3), 22–33 (2006).Google Scholar
- 3.V. S. Mileev, S. B. Rozanov, E. Yu. Baraboshkin, M. Yu. Nikitin, and I. V. Shalimov, Byull. Mosk. O-va Ispyt. Prir., Otd. Geol. 70 (1), 22–31 (1995).Google Scholar
- 4.V. V. Permyakov, M. N. Permyakova, and B. P. Chaikovskii, Preprint No. 91-12, IGN AN USSR (Inst. Geol. Sci., Acad. Sci. Ukrainian Soviet Socialist Republic, Kiev, 1991).Google Scholar
- 5.V. K. Piskunov, S. V. Rud’ko, and E. Yu. Baraboshkin, Byull. Mosk. O-va Ispyt. Prir., Otd. Geol. 87 (5), 7–23 (2012).Google Scholar
- 6.S. V. Rud’ko, Candidate’s Dissertation in Geology and Mineralogy (Geol. Inst. Russ. Acad. Sci., Moscow, 2014).Google Scholar
- 8.E. A. Uspenskaya, in Geology of the USSR, Vol. 8: The Crimea, Part 1: Jurassic System, Oolite (Nedra, Moscow, 1969), pp. 114–154 [in Russian].Google Scholar
- 9.V. G. Chernov, in Collection of Works of Scientific Students Society (Moscow State Univ., Moscow, 1963), Issue 4, pp. 3–110 [in Russian].Google Scholar
- 14.G. Postma, in Coarse Grained Deltas, Ed. by A. Colella and D. B. Prior (Spec. Publ. Int. Assoc. Sedimentol., 1990), Vol. 10, pp. 13–27.Google Scholar