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On origin and evolution of diamond-forming lower-mantle systems: physicochemical studies in experiments at 24 and 26 GPaстатья Исследовательская статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 6 февраля 2018 г.
- Авторы: Litvin YuA, Spivak A.V., Simonova D.A., Dubrovinsky L.S.
- Журнал: Journal of Physics: Conference Series
- Том: 950
- Год издания: 2017
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 042045
- DOI: 10.1088/1742-6596/950/4/042045
- Аннотация: The MgO - FeO - SiO2 - CaO system is representative for the dominant lower-mantle ultramafic assemblage ferropericlase (MgO center dot FeO)(ss) + bridgmanite (Mg,Fe)SiO3 + Ca-perovskite CaSiO3. Melting relations of the system were studied over its polythermal section (MgO)(70)(FeO)(30) - (SiO2)(70)(FeO)(30) at 24 GPa. A peritectic reaction of bridgmanite with melt was revealed to form the mafic assemblage stishovite SiO2 + periclase-wustite solid solution phases (MgO center dot FeO)(ss) (effect of "stishovite paradox"). Experimental phase relations demonstrate the possibility of ultramafic-mafic fractional evolution of the lower-mantle magma and in situ formation of stishovite. Moreover, origin of ultradeep diamonds and associated phases in melts of the MgO - FeO - SiO2 - CaO - (Mg-Fe-Na-K-carbonate) - carbon system have been examined at 26 GPa. A key role of the peritectic reaction of bridgmanite in genesis of mafic inclusions in lower-mantle diamonds is verified.
- Добавил в систему: Спивак Анна Валерьевна