Early Proterozoic Ultrahigh Pressure Metamorphism: Evidence from Hicrodiamonds

Pierre Cartigny, Ingrid Chinn, K. S. Viljoen, Derek Robinson

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Microdiamonds from the Akluilâtk minette dykes (Nunavut, Canada) are similar to diamonds formed in subducted metamorphic rocks. High concentrations of unaggregated nitrogen and positive δ15N suggest that the microdiamonds formed within rocks subducted to ultrahigh pressures before being sampled by the minette magma 1.8 billion years ago. This ultrahigh pressure metamorphism in North America, probably related to the Trans-Hudson orogen (about 2 billion years ago), extends the occurrence of ultrahigh pressure metamorphism from 0.6 billion years to before 1.8 billion years ago and suggests that Phanerozoic-type subductions were active by the Early Proterozoic.

Original languageEnglish
Pages (from-to)853-855
Number of pages3
JournalScience
Volume304
Issue number5672
DOIs
Publication statusPublished - 7 May 2004
Externally publishedYes

ASJC Scopus subject areas

  • Multidisciplinary

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