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Micron-scale coupled carbon isotope and nitrogen abundance variations in diamonds: Evidence for episodic diamond formation beneath the Siberian Craton

Research output: Contribution to journalArticlepeer-review

  • D. F. Wiggers de Vries
  • G. P. Bulanova
  • K. De Corte
  • D. G. Pearson
  • J. A. Craven
  • G. R. Davies

Related Edinburgh Organisations

Original languageEnglish
Pages (from-to)176-199
Number of pages24
JournalGeochimica et Cosmochimica Acta
Volume100
Issue numbern/a
Early online date15 Sep 2012
DOIs
Publication statusPublished - 1 Jan 2013

Abstract

The internal structure and growth history of six macro-diamonds from kimberlite pipes in Yakutia (Russia) were investigated with cathodoluminescence imaging and coupled carbon isotope and nitrogen abundance analyses along detailed core to rim traverses. The diamonds are characterised by octahedral zonation with layer-by-layer growth. High spatial resolution SIMS profiles establish that there is no exchange of the carbon isotope composition across growth boundaries at the mu m scale and that isotopic variations observed between (sub) zones within the diamonds are primary. The macro-diamonds have delta C-13 values that vary within 2 parts per thousand of -5.3 parts per thousand and their nitrogen contents range between 0-1334 at. ppm. There are markedly different nitrogen aggregation states between major growth zones within individual diamonds that demonstrate Yakutian diamonds grew in multiple growth events. Growth intervals were punctuated by stages of dissolution now associated with

    Research areas

  • YAKUTIAN KIMBERLITES, INFRARED-ABSORPTION, MIR KIMBERLITE, UPPER-MANTLE, PERIDOTITIC DIAMONDS, LITHOSPHERIC MANTLE, JERICHO KIMBERLITE, NATURAL DIAMOND, STABLE-ISOTOPES, OXYGEN FUGACITY

ID: 8607989