MINERALOGICAL AND PETROLOGICAL CHARACTERISTICS OF GRANITES OF THE SHPOLA-TASHLYK ORE DISTRICT (THE UKRAINIAN SHIELD)

地球化学 地质学 独居石 伟晶岩 黑云母 片麻岩 锆石 矿物学 变质岩 石英 古生物学
作者
V.О. Syomka,L.M. Stepanyuk,О.М. Пономаренко,S.M. Bondarenko,V.V. Sukach,Sergii Kurylo,M.O. Donskyi
出处
期刊:Mìneralogìčnij žurnal [National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka)]
卷期号:45 (4): 29-47
标识
DOI:10.15407/mineraljournal.45.04.029
摘要

Mineralogical and petrographical research of different types of granites of the Kirovohrad complex, such as of Lypniazhka, Berezivske, Yaroshivka, Dorofiivka, Hlodosy, in the Shpola-Tashlyk ore district of the Ukrainian Shield, has been conducted. It allows to identify them as rare-metal genetic type. The evidence comes from: High silica (SiO2 = 71.70—74.24%), agpaitic index (0.53—0.71) and low iron oxidation (0.16—0.59) in granites. Furthermore, they are enriched with fluorine and boron based on occurrence of accessory fluorite and tourmaline. Characteristic chemical feature of the granites is a prevalence of potassium over sodium. The contents of phosphorus, zirconium, cerium, lanthanum, and lithium in Berezivske granites exceed average contents for such elements of the Ukrainian Shield, due to accessory mineralization — apatite, monazite, and lithium-bearing mica. The most high lithium grades (55 ppm) are specific for Lypniazhka and Yaroshivka granites where at their exocontact zone the lithium deposits and occurrences of niobium, tantalum, and stannum were discovered. Based on structure and texture features, massive, porphyroblastic, gneiss-like, and aplite-pegmatoid types with gradual transitions were distinguished; it is an evidence of their genetic relation. It was defined that Lypniashka granites related to the lithium pegmatite deposit have mineralogical features comparing to other types of granites, such as: a) highest ВаО (0.44—0.53 %) content in microclines; b) most ferrous biotite (f = 0.64 %) with the highest content of fluorine (0.16 %). Isotopic and geochemical research of monazite was conducted. The granites age ranges from 2026 to 2042 Ma. The granites related to rare-metal mineralization yielded ages from 2026 to 2037 Ma comparing to the oreless granites (Smoline urban-type settlement) with age 2042 Ma. On biotite-garnet geothermometer study the granites’ formation temperatures were defined, such as: Dorofiivka granite — 625°С, Berezivske granite — 640ºС, Hlodosy granite — 640ºС, and Yaroshivka granite (Т = 640—750ºС, Р = 500—700 MPa). Considering field observations and facts mentioned above the Berezivske granites belong to rare-metal granite complex of S-type.
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