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"Recycled" volatiles in mantle derived diamonds-Evidence from nitrogen and noble gas isotopic data

Cécile Gautheron*, Pierre Cartigny, Manuel Moreira, Jeff W. Harris, Claude J. Allègre

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In a reinterpretation of our published rare gas data obtained on polycrystalline diamonds from the Orapa kimberlite (Botswana) [C.E. Gautheron, P. Cartigny, M. Moreira, J.W. Harris and C.J. Allègre, Evidence for a mantle component shown by rare gases, C. and N isotopes in polycrystalline diamonds from Orapa (Botswana), Earth Planet. Sci. Lett., 240 (2005) 559-572.], Mohapatra and Honda [R.K. Mohapatra, and M. Honda, "Recycled" volatiles in mantle derived diamonds-evidence from nitrogen and noble gas isotopic data, Earth Planet. Sci. Lett., this issue, 2006.] claim that mixing between a-priori defined proportions of subducted seawater, subducted recycled oceanic crust, recycled sediments, air and the mantle would be more appropriate to account for the observations. This view sharply contrasts with our conclusions that the chemical and isotope compositions of rare gases record diamond formation from mantle-derived fluid(s) together with mantle post-crystallization radiogenic/nucleogenic/fissiogenic ingrowth and preferential diffusion of the lightest atoms out of the diamonds in the mantle [C.E. Gautheron, P. Cartigny, M. Moreira, J.W. Harris and C.J. Allègre, Evidence for a mantle component shown by rare gases, C and N isotopes in polycrystalline diamonds from Orapa (Botswana), Earth Planet. Sci. Lett., 240 (2005) 559-572.]. We present here reasons why the alternative view of Mohapatra and Honda [R.K. Mohapatra and M. Honda, "Recycled" volatiles in mantle derived diamonds-evidence from nitrogen and noble gas isotopic data, Earth Planet. Sci. Lett., this issue, 2006.] is not supportable.

Original languageEnglish
Pages (from-to)220-222
Number of pages3
JournalEarth and Planetary Science Letters
Volume252
Issue number1-2
DOIs
Publication statusPublished - 30 Nov 2006
Externally publishedYes

Keywords

  • Diamond
  • Mantle
  • Rare gases
  • Stable isotopes
  • Subduction

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