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Melting relations of multicomponent carbonate MgCO3–FeCO3–CaCO3–Na2CO3 system at 12–26 GPa: application to deeper mantle diamond formationстатья
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: 20 марта 2018 г.
- Авторы: Spivak A., Dubrovinsky L., Solopova N., Litvin Y.
- Журнал: Physics and Chemistry of Minerals
- Том: 42
- Номер: 10
- Год издания: 2015
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 817
- Последняя страница: 824
- DOI: 10.1007/s00269-015-0765-6
- Аннотация: Carbonatic components of parental melts of the deeper mantle diamonds are inferred from their primary inclusions of (Mg, Fe, Ca, Na)-carbonate minerals trapped at PT conditions of the Earth’s transition zone and lower mantle. PT phase diagrams of MgCO3–FeCO3–CaCO3–Na2CO3 system and its ternary MgCO3–FeCO3–Na2CO3 boundary join were studied at pressures between 12 and 24 GPa and high temperatures. Experimental data point to eutectic solidus phase relations and indicate liquidus boundaries for completely miscible (Mg, Fe, Ca, Na)- and (Mg, Fe, Ca)-carbonate melts. PT fields for partial carbonate melts associated with (Mg, Fe)-, (Ca, Fe, Na)-, and (Na2Ca, Na2Fe)-carbonate solid solution phases are determined. Effective nucleation and mass crystallization of deeper mantle diamonds are realized in multicomponent (Mg, Fe, Ca, Na)-carbonatite–carbon melts at 18 and 26 GPa. The multicomponent carbonate systems were melted at temperatures that are lower than the geothermal ones. This gives an evidence for generation of diamond-parental carbonatite melts and formation of diamonds at the PT conditions of transition zone and lower mantle.
- Добавил в систему: Спивак Анна Валерьевна