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首页> 外文期刊>Contributions to Mineralogy and Petrology >Phase relations and formation of chromium-rich phases in the system Mg4Si4O12-Mg3Cr2Si3O12 at 10-24 GPa and 1,600 degrees C
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Phase relations and formation of chromium-rich phases in the system Mg4Si4O12-Mg3Cr2Si3O12 at 10-24 GPa and 1,600 degrees C

机译：Mg4Si4O12-Mg3Cr2Si3O12体系在10-24 GPa和1600摄氏度下的相关系和富铬相的形成

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摘要

Phase relations in the system Mg4Si4O12-Mg3Cr2Si3O12 were studied at 10-24 GPa and 1,600 degrees C using a high-pressure Kawai-type multi-anvil apparatus. We investigated the full range of starting compositions for the knorringite-majorite system to derive a P-X phase diagram and synthesize garnets of a wide compositional range. Samples synthesized in the pressure range 10-14 GPa contain knorringite-majorite garnet and Cr-bearing pyroxene. With increasing Cr content in the starting materials, an association of knorringite-majorite garnet and eskolaite is formed. Garnets contain a significant portion of majorite (>10 mol%) even for a pure Mg3Cr2Si3O12 starting composition. Knorringite-majorite garnets were obtained in the pressure range from 10 to 20 GPa. With increasing pressure, the phase assemblages include Cr-bearing MgSiO3 akimotoite and MgSiO3 bridgmanite, as well as MgCr2O4 with calcium titanate structure, and stishovite. Single-crystal X-ray diffraction shows that the incorporation of Cr into the structure of garnet, as well as MgSiO3 akimotoite, and bridgmanite results in an increase in their unit cell parameters. Results of the experimental high-pressure investigation of the pseudo-binary system Mg4Si4O12-Mg3Cr2Si3O12 SiO2-MgO-Cr2O3) may be applied to the origin of high chromium phases mostly garnet) found as inclusions in peridotitic diamonds and formed in bulk rock compositions with high Cr/Al ratios in relation to the primitive mantle.
机译：使用高压Kawai型多砧装置在10-24 GPa和1600摄氏度下研究了Mg4Si4O12-Mg3Cr2Si3O12系统中的相关系。我们研究了方铅矿-马氏体体系的全部起始成分，以得出P-X相图并合成了宽范围的石榴石。在10-14 GPa的压力范围内合成的样品包含水钠钙榴石-菱镁矿石榴石和含铬的辉石。随着起始材料中Cr含量的增加，形成了水钠钙榴石-马氏体石榴石和埃斯科拉石的缔合体。石榴石甚至包含纯Mg3Cr2Si3O12起始成分，也包含大量的菱铁矿（> 10 mol％）。在10至20GPa的压力范围内获得了水钠钙榴石-马氏体石榴石。随着压力的增加，相组成包括含铬的MgSiO3裸沸石和MgSiO3桥锰矿，以及具有钛酸钙结构的MgCr2O4和辉石。 X射线单晶衍射表明，将Cr掺入石榴石结构以及MgSiO3裸沸石和水辉石会增加其晶胞参数。准二元体系Mg4Si4O12-Mg3Cr2Si3O12 SiO2-MgO-Cr2O3的高压实验结果可应用于高铬相的来源，主要是石榴石），这些高铬相是钙镁橄榄石中的包裹体，并形成于高铬的块状岩石中相对于原始地幔的Cr / Al比。

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