Origin of REE-rich ferrocarbonatites in southern Siberia (Russia): implications based on melt and fluid inclusions

Ilya R. Prokopyev, Alexander S. Borisenko, Andrey A. Borovikov, Galina G. Pavlova

Результат исследования: Научные публикации в периодических изданияхстатья

15 Цитирования (Scopus)

Аннотация

Fe-rich carbonatites with a mineral assemblage of ankerite-calcite or siderite are widespread in southern Siberia, Russia. The siderite carbonatites are associated with F-Ba-Sr-REE mineralization and have a 40Ar/39Ar age of 117.2 ± 1.3 Ma. Melt and fluid inclusions suggest that the carbonatites formed from volatile-rich alkali- and chloride-bearing carbonate melts. Ankerite-calcite carbonatites formed from carbonatite melt at a temperature of more than 790 °C. The ferrocarbonatites (the second phase of carbonatite intrusion) formed from a sulfate-carbonate-chloride fluid phase (brine-melt) at >650 °C and ≥360 MPa. The brine-melt fluid phase had high concentrations of Fe and LREEs. A subsequent hydrothermal overprint contributed to the formation of economically important barite-Sr-fluorite-REE mineralization in polymict siderite breccia.

Язык оригиналаанглийский
Страницы (с-по)845-859
Число страниц15
ЖурналMineralogy and Petrology
Том110
Номер выпуска6
DOI
СостояниеОпубликовано - 1 дек 2016

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