Phase equilibria in the MgO-SiO2-ZrO2 system

被引：2
|
作者：
Ryzhkov, V. M. [1 ]
Anfilogov, V. N. [1 ]
Blinov, I. A. [1 ]
Krasnobaev, A. A. [2 ]
Valizer, P. M. [3 ]
机构：
[1] Russian Acad Sci, Inst Mineral, Ural Branch, Miass, Chelyabinsk Obl, Russia
[2] Russian Acad Sci, Zavaritskii Inst Geol & Geochem, Ural Branch, Ul Vonsovskogo 15, Ekaterinburg 620016, Russia
[3] Russian Acad Sci, Ural Branch, Ilmeny State Reserve, Miass, Chelyabinsk Obl, Russia
来源：
DOKLADY EARTH SCIENCES | 2016年 / 469卷 / 02期
关键词：
DUNITE;
D O I：
10.1134/S1028334X16080079
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
The results of study of phase equilibria in the MgO-SiO2-ZrO2 system at 1450-1550A degrees C are reported. The studied system contains two eutectic points and six fields: (I) MgSiO3 + SiO2; (II) MgSiO3 + ZrO2; (III) ZrSiO4 + SiO2; (IV) MgSiO3 + Mg2SiO4; (V) ZrO2 + MgO; (VI) ZrSiO4 + ZrO2. 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 ZrO2 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.
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页码：824 / 827
页数：4
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