Strontium isotope analysis of kimberlitic groundmass perovskite via LA-MC-ICP-MS

Chad Paton*, Jon D. Woodhead, Janet M. Hergt, David Phillips, Simon Shee

*Corresponding author for this work

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Strontium isotopic composition is a potentially powerful tracer in studies of kimberlitic rocks but the results from even the most carefully collected and stringently prepared bulk-rock samples are still hampered by contamination and alteration effects. Here we describe a LA-MC-ICP-MS technique which can obtain accurate, high precision Sr i ratios from 50-150 μm kimberlitic groundmass perovskite without requiring time-consuming mineral separation procedures. Since perovskite is a robust magmatic phase with an extremely low Rb/Sr ratio, the effects of late-stage crustal contamination, post-emplacement alteration and age correction are minimised and results are more representative of primary melt compositions, while additionally preserving powerful grain-scale spatial and textural information. We demonstrate that the adopted protocol overcomes isobaric interferences from Kr +, Rb +, Er 2+ and Yb 2+, and that Ca dimers and Ca argides do not detectably affect the quality of 87Sr/ 86Sr ratios produced. To illustrate the utility of the technique, contrasting bulk-rock and in situ perovskite results from eleven Proterozoic kimberlites are documented.

Original languageEnglish
Pages (from-to)321-330
Number of pages10
JournalGeostandards and Geoanalytical Research
Volume31
Issue number4
DOIs
Publication statusPublished - Dec 2007
Externally publishedYes

Keywords

  • Isotope
  • Kimberlite
  • Perovskite
  • Strontium

Fingerprint Dive into the research topics of 'Strontium isotope analysis of kimberlitic groundmass perovskite via LA-MC-ICP-MS'. Together they form a unique fingerprint.

  • Cite this