Carbonatitic melts in cuboid diamonds from Udachnaya kimberlite pipe (Yakutia): evidence from vibrational spectroscopy
Carbonatitic melts in cuboid diamonds from Udachnaya kimberlite pipe (Yakutia): evidence from vibrational spectroscopy
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DOI：
10.1180/0026461046810171
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发表时间：
2004-02
影响因子：
2.7
通讯作者：
D. Zedgenizov;H. Kagi;V. Shatsky;N. Sobolev
中科院分区：
文献类型：
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作者：
D. Zedgenizov;H. Kagi;V. Shatsky;N. Sobolev
本文用振动光谱法研究了产自乌达奇纳亚金伯利岩筒的55颗立方晶系金刚石中的显微包裹体（1 - 10 μm）。这揭示了Udachnaya金伯利岩管中立方金刚石的多相组合。该组合包括碳酸盐、橄榄石、磷灰石、石墨、水和硅酸盐玻璃。微包裹体保持高的内部压力，并使人相信原始材料在宿主金刚石生长期间被捕获。内压，外推到地幔温度，位于钻石的稳定性领域和相对较低的温度是典型的立方体钻石的形成。与先前报道的非洲钻石数据相反，来自Udachnaya的长方体中的微包裹体的成分非常碳酸岩化（H2O/（H2O+CO2）= 5%-20%），观察到的微包裹体组合类似于某些类型的碳酸岩。Udachnaya金刚石微包裹体中的水和硅含量较低，证明其物质为近固相线碳酸盐熔体。振动光谱提供了立方金刚石中存在碳酸盐熔体的证据。
Abstract Micro-inclusions (1 −10 μm) in 55 diamonds of cubic habit from the Udachnaya kimberlite pipe have been studied using vibrational spectroscopy. This has revealed a multiphase assemblage in cuboid diamonds from the Udachnaya kimberlite pipe. This assemblage includes carbonates, olivine, apatite, graphite, water and silicate glasses. The micro-inclusions preserve the high internal pressure and give confidence that the original materials were trapped during growth of the host diamond. The internal pressures, extrapolated to mantle temperatures, lie within the stability field of diamond and the relatively low temperatures are typical for the formation of cuboid diamonds. In contrast to previously reported data for African diamonds, the micro-inclusions in the cuboids from Udachnaya are extremely carbonatitic in composition (H2O/(H2O+CO2) ≈5−20%) with the observed assemblage of microinclusions similar to some types of carbonatites. The low water and silica content testify that the material in the micro-inclusions of the Udachnaya diamonds was near-solidus carbonatitic melt. Vibrational spectroscopy has provided the evidence of carbonatitic melts in cuboid diamonds.