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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Extremely fluorine-rich fluoborite from fumarolic exhalations of the Tolbachik volcano (Kamchatka)статья
- Авторы: Bulakh M.O., Pekov I.V., Chukanov N.V., Yapaskurt V.O., Koshlyakova N.N., Britvin S.N., Sidorov E.G.
- Журнал: Geology of Ore Deposits
- Том: 64
- Номер: 7
- Год издания: 2022
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 432
- Последняя страница: 441
- DOI: 10.1134/S1075701522070042
- Аннотация: Fluoborite extremely close to the fluorine end-member of the fluoborite Mg3[BO3]F3–hydroxylborite Mg3[BO3](ОН)3 series, was found in exhalations of the Arsenatnaya fumarole (Tolbachik volcano, Kamchatka, Russia). The amount of the Mg3[BO3](ОН)3 component in it does not exceed 1 mol. %. This borate is associated with halite, sylvite, langbeinite-group and aphthitalite-group sulfates, anhydrite, krasheninnikovite, sanidine, fluorophlogopite, hematite, tenorite, chubarovite, alluaudite-group arsenates, lammerite and urusovite. Fluoborite forms here fine acicular or hair-like crystals up to 5 mm long assembled in radial, near-parallel or chaotic open-work aggregates up to 10 cm across. Its chemical composition determined by the electron microprobe is: Mg 38.71, B 5.90, O 25.52, F 30.83, total 100.96 wt.%; the empirical formula is: Mg2.97B1.02O2.98F3.03. The unit-cell parameters calculated from the powder X-ray diffraction pattern are: a = 8.808(4), c = 3.098(2) Å, V = 208.1(3) Å3. The IR and Raman spectra of borates of the fluoborite–hydroxylborite series are given and discussed. Fluoborite in the Arsenatnaya fumarole crystallized at a temperature not lower than 450°C. The fumarolic genetic type is novel for this borate.
- Добавил в систему: Булах Мария Олеговна