Carbon isotope fractionation during high pressure and high temperature crystallization of Fe-C melt

V. N. Reutsky, Yu M. Borzdov, Yu N. Palyanov

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

There is a growing body of experimental evidence that iron carbides can play an important role in the mantle both as a host of carbon and as a redox couple (Fe-C) determining the nature of reduced phases. If carbides are significant in the mantle, it could be of interest to know if any carbon isotope fractionation accompanies carbide crystallization. A series of high-pressure and high-temperature experiments were performed on carbide crystallization from a Fe-C melt. An offset of 2‰ was observed between the δ13C values of Fe3C and Fe-C melt at 6.3GPa and 1400°C. The carbon isotopic compositions of Fe3C and diamond crystallizing from a single carbon source near the peritectic region at 6.3GPa differ by 2.5‰. Fe7C3 was detected as a quench phase during Fe-C melt quenching. Our results have important implications for understanding carbon isotope distributions in iron meteorites and indicate that iron carbide crystallization may be a significant mechanism for carbon isotope heterogeneity in the Earth's mantle.

Original languageEnglish
Pages (from-to)18-24
Number of pages7
JournalChemical Geology
Volume406
DOIs
Publication statusPublished - 6 Jun 2015

Keywords

  • Carbon isotope fractionation
  • Crystallization
  • Diamond
  • Fe-C melt
  • HPHT experiment
  • Iron carbide

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