O.B. Vysotsky V.O. Syomka, L.M. Stepanyuk, T.I. Dovbush, S.M. Bondarenko
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
Language: Ukrainian
Geochemistry and ore formation 2019, 40: 15-22
https://doi.org/10.15407/gof.2019.40.015
Within the Volyn megablock, ores and manifestations of molybdenum mineralization are known in diorites, granodiorites, aplites, pegmatites, pertozites, which are associated with the granitoids of the Osnitsky, Bukinsky, Zhytomyrsky, Perzhansky and Korostensky complexes. The molybdenum-bearing rocks of the Osnitsky block by geological observations are the youngest intrusive formations and are currently not covered by radiogeochronological studies. Therefore, radiogeochronolog- ical studies were performed on zircon, which was isolated from Osnitsky granites (sample B-4/2) and quartz-microcline aplits (sample 9/17) from the Virovsky group of manifestations of molybdenum mineralization, which includes Jasnogorsk and Virovsky ores manifestations . The primary source of molybdenum is the main rocks of the Klesiv volcanogenic series, with the granitization of which molybdenum-bearing hybrid rocks and metasomatites were formed. The Vyrivsky ore manifesta- tion of molybdenum together with the manifestation of the molybdenum mineralization of Yasnogyrka and Tomashgorod villages is within the dome structure bounded by faults of the northwestern — Tomashgorod from the northeast and Novograd- Volynsky from the southwest. From the north, this structure is bounded by Strelskaya, and from the south by Sushchano- Perjan sub-latitudinal faults. The core of the structure is omposed of leucocratic aplite-pegmatoid granites with relics of metabasite (metaefusives and their hypabisal analogues), whereas the framing is of rocks of granodiorite formation. Just to the core of this structure and timed Virovsky manifestation of molybdenite. The ore was discovered in a open pit that reveals the granitoids of the Osnitsky complex. In addition to granite sputtering, molybdenite is also found in aplits, pegmatites and quartz veins. It is found that the most
enriched with molybdenite are fine- and medium-grained granites, which, in mineral and chemical composition, correspond to quartz-microcline aplits and are the most recent formations. As a result of the U- Pb isotope dating, the molybdenum rocks of the Vyrivsky group were formed 1.97-1.95 Ga.
Keywords: Osnitsky block, granite, molybdenum mineralization, zircon, isotope age, Ukrainian Shield.
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