Spectroscopic evidence of the origin of brown and pink diamonds family from Internatsionalnaya kimberlite pipe (Siberian craton)

Olga P. Yuryeva, Mariana I. Rakhmanova, Dmitry A. Zedgenizov, Viktoria V. Kalinina

Research output: Contribution to journalReview articlepeer-review

3 Citations (Scopus)

Abstract

New spectroscopic data were obtained to distinguish the specific features of brown and pink diamonds from Internatsionalnaya kimberlite pipe (Siberian craton). It is shown that pink and brown samples differ markedly in the content and degree of aggregation of nitrogen defects. Pink diamonds generally have higher nitrogen content and a lower aggregation state compared to brown samples, which often show significant variations in nitrogen content and aggregation state between different growth zones. The 491 and 576 nm luminescent centres, which are signs of deformed brown diamonds, are absent or of low intensity in pink diamonds implying that high nitrogen content predominantly in A form in the pink diamonds had stiffened the diamonds against natural plastic deformation. The GR1 centre, formed by a neutrally charged vacancy, was observed only in pink diamonds, which may be due to their formation and storage in the mantle at lower-temperature conditions. Mineral inclusions indicate peridotitic and eclogitic paragenesis for studied brown and pink diamonds, respectively. It is suggested that brown diamonds have been formed in a primitive mantle at higher temperatures and/or stored there much longer.

Original languageEnglish
Article number20
Number of pages19
JournalPhysics and Chemistry of Minerals
Volume47
Issue number4
DOIs
Publication statusPublished - 7 Mar 2020

Keywords

  • Brown
  • Defects
  • Deformation
  • Diamond
  • Internatsionalnaya pipe
  • Luminescence
  • Mantle
  • Pink
  • PHOTOLUMINESCENCE
  • INFRARED-ABSORPTION
  • OPTICAL-PROPERTIES
  • CENTERS
  • NATURAL DIAMONDS
  • CLOUDY MICROINCLUSIONS
  • COLOR
  • NITROGEN
  • PLASTIC-DEFORMATION
  • RED LUMINESCENCE SPECTRUM

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