Инд. авторы:	Prokopyev I.R, Kozlov E., Fomina E., Doroshkevich A.G., Dyomkin M.
Заглавие:	Mineralogy and fluid regime of formation of the REE-late-stage hydrothermal mineralization of petyayan-vara carbonatites Vuoriyarvi, Kola region, NW Russia
Библ. ссылка:	Prokopyev I.R, Kozlov E., Fomina E., Doroshkevich A.G., Dyomkin M. Mineralogy and fluid regime of formation of the REE-late-stage hydrothermal mineralization of petyayan-vara carbonatites Vuoriyarvi, Kola region, NW Russia // Minerals. - 2020. - Vol.10. - Iss. 5. - Art.405. - ISSN 2075-163X.
Внешние системы:	DOI: 10.3390/min10050405; РИНЦ: 43286203; SCOPUS: 2-s2.0-85085008566; WoS: 000548343700020;
Реферат:	eng: The Vuoriyarvi Devonian alkaline–ultramafic complex (northwest Russia) contains magnesiocarbonatites with rare earth mineralization localized in the Petyayan-Vara area. High concentrations of rare earth elements are found in two types of these rocks: (a) ancylite-dominant magnesiocarbonatites with ancylite–baryte–strontianite–calcite–quartz (±late Ca–Fe–Mg carbonates) ore assemblage, i.e., “ancylite ores”; (b) breccias of magnesiocarbonatites with a quartz–bastnäsite matrix (±late Ca–Fe–Mg carbonates), i.e., “bastnäsite ores.” We studied fluid inclusions in quartz and late-stage Ca–Fe–Mg carbonates from these ore assemblages. Fluid inclusion data show that ore-related mineralization was formed in several stages. We propose the following TX evolution scheme for ore-related processes: (1) the formation of ancylite ores began under the influence of highly concentrated (>50 wt.%) sulphate fluids (with thenardite and anhydrite predominant in the daughter phases of inclusions) at a temperature above300–350 °C; (2) the completion of the formation of ancylite ores and their auto-metasomatic alteration occurred under the influence of concentrated (40–45 wt.%) carbonate fluids (shortite and synchysite–Ce in fluid inclusions) at a temperature above 250–275 °C; (3) bastnäsite ores deposited from low-concentrated (20–30 wt.%) hydrocarbonate–chloride fluids (halite, nahcolite, and/or gaylussite in fluid inclusions) at a temperature of 190–250 °C or higher. Later hydrothermal mineralization was related to the lowconcentration hydrocarbonate–chloride fluids (<15 wt.% NaCl-equ.) at 150–200 °C. The presented data show the specific features of the mineral and fluid evolution of ore-related late-stage hydrothermal rare earth element (REE) mineralization of the Vuoriyarvi alkaline–ultramafic complex. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
Ключевые слова:	REE; Magnesiocarbonatites; Kola Alkaline Province; Fluid inclusion; Bastnäsite; Ancylite; Vuoriyarvi;
Издано:	2020
Физ. характеристика:	405