Sapphires from the Sutara placer in the Russian far east

Svetlana Yuryevna Buravleva, Sergey Zakharovich Smirnov, Vera Alekseevna Pakhomova, Dmitrii Gennadyevich Fedoseev

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

From 2009 to 2011, sapphire crystals and corundum-bearing rocks were discovered at Sutara, in the Jewish Autonomous Region of the Russian Far East. These sapphires are typically translucent to semitransparent and blue to pinkish blue. Most of the crystals are heavily included and display prominent growth zoning, twinning planes, and abundant exsolution lamellae. Their primary fluid inclusions contain diaspore crystals and a lowdensity CO2-CH4 mixture. These inclusions indicate that sapphire mineralization occurred by means of low-density aqueous-carbonic fluids, which were able to carry significant concentrations of alumina. These fluids may have formed as a result of thermal impact of granitic magma on carbonate country rocks. The authors consider Sutara a metamorphic occurrence that formed as a result of diffusive and metasomatic processes at a region of contact between carbonate rocks and pegmatite veins.

Язык оригиналаанглийский
Страницы (с-по)252-264
Число страниц13
ЖурналGems and Gemology
Том52
Номер выпуска3
DOI
СостояниеОпубликовано - 1 сен 2016
Опубликовано для внешнего пользованияДа

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