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Carbonatitic melts in cuboid diamonds from Udachnaya kimberlite pipe (Yakutia): evidence from vibrational spectroscopy

Published online by Cambridge University Press:  05 July 2018

D. A. Zedgenizov ,
H. Kagi ,
V. S. Shatsky  and
N. V. Sobolev
D. A. Zedgenizov*
Affiliation:
Institute of Mineralogy and Petrography of SBRAS, pr. Koptyuga 3, 630090, Novosibirsk, Russia
H. Kagi
Affiliation:
Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan
V. S. Shatsky
Affiliation:
Institute of Mineralogy and Petrography of SBRAS, pr. Koptyuga 3, 630090, Novosibirsk, Russia
N. V. Sobolev
Affiliation:
Institute of Mineralogy and Petrography of SBRAS, pr. Koptyuga 3, 630090, Novosibirsk, Russia
*
*E-mail: [email protected]
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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.

Keywords

carbonatitic meltdiamondsUdachnaya kimberlite pipevibrational spectroscopyinclusions
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 1 , February 2004 , pp. 61 - 73
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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