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- W4291208841 abstract "Abstract The Ermakovo F–Be deposit, the largest Be deposit in Russia and one of the world’s largest deposits, is located in West Transbaikalia. The ores of the deposit are diverse in their morphology and composition; mostly there are phenakite–bertrandite–fluorite metasomatites after limestones. The origin of Be mineralization is related to the stock of leucocratic subalkali aegirine-bearing granites, the age of which corresponds to 224–226 Ma. The available age of ores of 225.5–219 Ma is close to the age of ore-generating granites. To specify the age of the ores, we determined the 40 Ar/ 39 Ar age of K-feldspar and, for the first time, of the Be mineral milarite, a K- and H 2 O-bearing Be silicate (KCa 2 (Be 2 AlSi 12 O 30 )·H 2 O), from different ore bodies of the Ermakovo deposit. The age spectrum of milarite (sample Er-17) has a stable plateau in the high-temperature part, which consists of four consecutive steps composing ~50% of the released 39 Ar with an age of 182.5 ± 3.0 Ma. The age of K-feldspars is similar (169.8–170.6 Ma). The results of 40 Ar/ 39 Ar dating of minerals from ores of the Ermakovo F–Be deposit indicate that the processes of mineral formation occurred over a long period from 225 to 170 Ma." @default.
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- W4291208841 date "2022-07-01" @default.
- W4291208841 modified "2023-10-10" @default.
- W4291208841 title "Results of 40Ar/39Ar Dating of Ores of the Ermakovo F–Be Deposit, West Transbaikalia, Russia" @default.
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- W4291208841 doi "https://doi.org/10.1134/s1028334x22070066" @default.
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