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Doklady Earth Sciences

, Volume 484, Issue 1, pp 84–88 | Cite as

The Mechanism of Disordered Graphite Formation in UHP Diamond-Bearing Complexes

  • O. V. ShchepetovaEmail author
  • A. V. Korsakov
  • P. S. Zelenovskiy
  • D. S. Mikhailenko
GEOCHEMISTRY
  • 17 Downloads

Abstract

Kyanite gneiss from the “New Barchinsky” locality (Kokchetav Massif) was studied in detail. This rock is characterized by zonal distribution of the C and SiO2 polymorphs in kyanite porphyroblasts: (1) cores with graphite and quartz inclusions; (2) clean overgrowth zone with inclusions of cuboctahedral diamond crystals. The Raman mapping of SiO2 polymorphs originally showed the presence of an association of disordered graphite + coesite “prohibited” in HT diamond-bearing rocks. Graphitization of diamond is the only likely mechanism of the disordered graphite formation in HT diamond-bearing rocks. However, the absence of disordered graphite in association with diamond in kyanite porphyroblasts from kyanite gneiss from the “New Barchinsky” locality eliminates the process of diamond graphitization at the retrograde stage. Most likely, crystallization of disordered graphite occurred at the retrograde stage from the UHP C–O–H fluid.

Notes

ACKNOWLEDGMENTS

This study was supported by the Russian Science Foundation, project no. 15-17-30012. The equipment of Ural Center for Shared Use “Modern Nanotechnologies,” Ural Federal University, was used.

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • O. V. Shchepetova
    • 1
    Email author
  • A. V. Korsakov
    • 1
  • P. S. Zelenovskiy
    • 2
  • D. S. Mikhailenko
    • 1
  1. 1.Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of SciencesNovosibirskRussia
  2. 2.Institute of Natural Sciences and Mathematics, Ural Federal UniversityYekaterinburgRussia

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