Phase equilibria in the MgO–SiO2–ZrO2 system

The results of study of phase equilibria in the MgO–SiO 2 –ZrO 2 system at 1450–1550°C are reported. The studied system contains two eutectic points and six fields: (I) MgSiO 3 + SiO 2 ; (II) MgSiO 3 + ZrO 2 ; (III) ZrSiO 4 + SiO 2 ; (IV) MgSiO 3 + Mg 2 SiO 4 ; (V) ZrO 2 + MgO; (VI) ZrSiO 4 + ZrO 2...

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Bibliographic Details
Published in:Doklady earth sciences 2016-08, Vol.469 (2), p.824-827
Main Authors: Ryzhkov, V. M., Anfilogov, V. N., Blinov, I. A., Krasnobaev, A. A., Valizer, P. M.
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Geochemistry
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Summary:The results of study of phase equilibria in the MgO–SiO 2 –ZrO 2 system at 1450–1550°C are reported. The studied system contains two eutectic points and six fields: (I) MgSiO 3 + SiO 2 ; (II) MgSiO 3 + ZrO 2 ; (III) ZrSiO 4 + SiO 2 ; (IV) MgSiO 3 + Mg 2 SiO 4 ; (V) ZrO 2 + MgO; (VI) ZrSiO 4 + ZrO 2 . The presence of fields (II) and (III) on the diagram shows that zircon in equilibrium with olivine and pyroxene crystallizes at very low concentrations of ZrO 2 in the system. This provides a solution for one of the most important problems in zirconology of dunites: the probability of the formation and preservation of zircon in the course of the formation and evolution of dunite.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X16080079