Experimental Modeling of C0-Forming Processes Involving Cohenite and CO2-Fluid in a Silicate Mantle

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Abstract

Abstract: Experimental studies were performed in the Fe3C–SiO2–(Mg,Ca)CO3 system (6.3 GPа, 1100–1500°C, 20–40 h). It is established that the carbide–oxide–carbonate interaction leads to the formation of ferrosilite, fayalite, graphite, and cohenite (1100 and 1200°С), as well as a Fe–C melt (1300°С). It is determined that the main processes in the system are decarbonation, redox-reactions of cohenite and a CO2-fluid, extraction of carbon from carbide, and crystallization of metastable graphite (± diamond growth), as well as the formation of ferriferous silicates. The interaction studied can be considered as a simplified model of the processes that occur during the subduction of oxidized crustal material to reduced mantle rocks.

Original languageEnglish
Pages (from-to)1427-1430
Number of pages4
JournalDoklady Earth Sciences
Volume483
Issue number1
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • DIAMOND FORMATION
  • IRON CARBIDE
  • CARBON
  • GRAPHITE
  • MECHANISMS
  • INCLUSIONS
  • PARAMETERS
  • NITROGEN
  • IMPURITY
  • GROWTH

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