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Doklady Earth Sciences

, Volume 461, Issue 1, pp 297–300 | Cite as

Carbonate-silicate composition of diamond-forming media of fibrous diamonds from the Snap Lake area (Canada)

  • D. A. ZedgenizovEmail author
  • N. P. Pokhilenko
  • W. L. Griffin
Geochemistry

Abstract

This study presents new data on the compositions of microinclusions in fibrous diamonds from the Snap Lake area in the eastern part of the Slave Craton (Canada). The compositional trends of diamond microinclusions are consistent with those of diamond-forming media ranging continuously between a highly carbonatitic endmember and a highly silicic endmember. The microinclusions exhibit general enrichment of most incompatible elements, which is probably indicative of their crystallization during partial melting of mantle peridotites and eclogites. Our results also suggest that the diamond analyzed in this study may have formed as a result of interaction between carbonate-silicate melts and peridotitic wall-rocks at the base of a thick lithospheric mantle at depths below 300 km. The trace element distributions in the studied diamond microinclusions show a general similarity to those previously found in the parental kimberlites and carbonatites. These data suggest that diamonds may have crystallized either directly from a kimberlitic/carbonatitic melt or from a proto-kimberlitic fluid/melt, which was derived from a source also common to kimberlites. This is supported by differences in the major element compositions of diamond-forming fluids/melts and kimberlites.

Keywords

Incompatible Element Trace Element Pattern Trace Element Distribution Primitive Mantle Normalize Trace Element Slave Craton 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  • D. A. Zedgenizov
    • 1
    • 2
    Email author
  • N. P. Pokhilenko
    • 1
    • 2
  • W. L. Griffin
    • 3
  1. 1.Sobolev Institute of Geology and Mineralogy, Siberian BranchRussian Academy of SciencesNovosibirskRussia
  2. 2.Novosibirsk State UniversityNovosibirskRussia
  3. 3.ARC National Key Centre for GEMOCMacquarie UniversitySydneyAustralia

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