The join CaCO3-CaSiO3 at 6 GPa with implication to Ca-rich lithologies trapped by kimberlitic diamonds

Anastasia S. Fedoraeva, Anton Shatskiy, Konstantin D. Litasov

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

1 Цитирования (Scopus)

Аннотация

Phase relations in the CaCO3–CaSiO3 system have been studied at 6 GPa and 1300–1750°C. At 1300°C, the subsolidus assemblage comprises of aragonite and walstromite. The eutectic was established at 1400°C and 57 mol% CaSiO3. Just below its melting temperature at 1660°C, the CaCO3 solid quenches to calcite, while, at ≤1600°C, it quenches to aragonite. At 1700°C, a walstromite + larnite + liquid assemblage appears, indicating that the system deviates from a simple binary. Incongruent melting of walstromite to produce larnite and a liquid occurs at 1750°C. The diamonds containing inclusions of walstromite and CaCO3 could be formed as a result of the partial reduction of the CaCO3-CaSiO3 melt derived by melting of walstromite-bearing CaCO3 limestones on the top of basaltic crust subducted to a depth of ≥180 km and warming to ≥1400°C.

Язык оригиналаанглийский
Страницы (с-по)547-560
Число страниц14
ЖурналHigh Pressure Research
Том39
Номер выпуска4
DOI
СостояниеОпубликовано - 4 сен 2019

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