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Ludwigite and yuanfuliite from fumarolic exhalations of the Tolbachik volcano (Kamchatka, Russia)статья
- Авторы: Bulakh M.O., Pekov I.V., Koshlyakova N.N., Sidorov E.G.
- Журнал: Geology of Ore Deposits
- Том: 64
- Номер: 8
- Год издания: 2022
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 607
- Последняя страница: 621
- DOI: 10.1134/S1075701522080037
- Аннотация: The paper is devoted to ludwigite and yuanfuliite of the fumarolic genetic type, which is novel for these minerals. Both ferric-magnesian borates (oxoborates) were found in exhalations of the Arsenatnaya fumarole at the Tolbachik volcano, Kamchatka, Russia. They occur in mineral assemblages formed at temperatures above 550°С. Ludwigite is mainly associated with anhydrite, diopside, garnets of the berzeliite–schäferite series, tilasite, svabite, calciojohillerite, hematite, rhabdoborite-group minerals, whereas yuanfuliite occurs with hematite, forsterite, enstatite, diopside, fluorophlogopite, magnesioferrite and spinel. The replacement of ludwigite by yuanfuliite was observed. Both oxoborates are represented by earlier unknown chemical varieties, almost without Fe2+, Al and Ti admixtures. Ludwigite is enriched with Mn3+, up to the composition (Mg2.05Cu0.01)2.06(Fe3+0.71Mn3+0.29Cr0.01)1.01[B0.96O3]O2. Yuanfuliite is chemically very close to the ferric end-member of the warwickite–yuanfuliite series and contains only a small amount of Sn impurity; the typical composition is Mg1.10Fe3+0.91Sn0.03[B0.98O3]O. The orthorhombic unit-cell parameters are: a = 9.297(6), b = 12.349(7), c = 3.021(2) Å, V = 346.5(4) Å3 for ludwigite; a = 9.30(4), b = 9.43(3), c = 3.051(13) Å, V = 268(2) Å3 for yuanfuliite. The Raman spectra of ludwigite with different contents of admixtures, as well as yuanfuliite and warwickite, are given and discussed.
- Добавил в систему: Булах Мария Олеговна