Antiquity of peridotitic diamonds from the Siberian craton

S. H. Richardson*, J. W. Harris

*Corresponding author for this work

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

Diamonds erupted by kimberlites traversing ancient continental tectosphere [1] provide a window into the evolution of continents and their mantle keels. However, the vintage of this window; that is, the timing of crystallization of peridotitic mineral inclusion-bearing diamonds beneath different cratons, has proved controversial because of the model age arguments involved [2-12]. Isochron age data for peridotitic garnets in combination with nitrogen aggregation data for host diamonds from the Udachnaya kimberlite on the Siberian craton show that such diamonds are ancient and could not have crystallized as recently ( < 70 ka before eruption) as proposed [10-12]. The garnets yield a Sm-Nd isochron age of 2.0 Ga and the diamonds display nitrogen aggregation characteristics requiring lithospheric mantle storage at temperatures of 1100-1200°C for a comparable period. The crystallization age of these 'peridotitic' diamonds is similar to that of equivalent diamonds from the Premier kimberlite on the Kaapvaal craton, which postdate the massive 2.05 Ga old Bushveld Complex and represent a diamond generation unrelated to craton keel stabilization 3.2 Ga ago [3,9,10].

Original languageEnglish
Pages (from-to)271-277
Number of pages7
JournalEarth and Planetary Science Letters
Volume151
Issue number3-4
Publication statusPublished - Oct 1997
Externally publishedYes

Keywords

  • Cratons
  • Diamond
  • Garnet group
  • Mantle
  • Peridotites
  • Siberia

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    Richardson, S. H., & Harris, J. W. (1997). Antiquity of peridotitic diamonds from the Siberian craton. Earth and Planetary Science Letters, 151(3-4), 271-277.