Первая находка сассолина (H3BO3) во флюидных включениях в минералахстатья
Статья опубликована в журнале из списка RSCI Web of Science
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Статья опубликована в журнале из перечня ВАК
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 20 сентября 2013 г.
Аннотация:Daughter crystals of sassolite, crystalline boric acid (H3BO3), have been first found in gas-liquid inclusions in minerals from the pegmatite veins Mika and Amazonitovaya in the Kukurt gemstone district (Central Pamirs). The crystals at sassolite are rounded, tabular, less frequently, idiomorphic, with low refractive indices and high birefringence. The Raman spectrum of sassolite has an intense line near 880 cm(-1) and a weaker one at 499 cm(-1) Sassolite crystals in inclusions of types 1 and 2 in quartz from the miarolitic cavity of the Mika vein occur in associations with daughter crystals of halite and Cs-bearing sylvite. In inclusions of type 3 in quartz and tourmaline of the Mika vein and in quartz and adularia of the Amazonitovaya vein sassolite is the only daughter mineral.
Study of sassolite-bearing inclusions has shown that the miarolitic cavities and near-cavity complexes of the Mika and Amazonitovaya pegmatite veins contain concentrated solutions of boric add (6.7-14.8 and 5.9-10.0 wt. % H3BO3, respectively), chlorides and fluorides of K, Li, Cs, Fe, and Mn, and CO2. The presence of daughter sassolite suggests of boron migration in the form of H3BO3 under hydrothermal conditions. The data obtained are of great interest tar reconstructing the conditions of formation of bath granite pegmatites and hydrothermal systems where baron actively participated in mineral formation.