Sr and Pb isotopic composition of five USGS glasses (BHVO-2G, BIR-1G, BCR-2G, TB-1G, NKT-1G)

Marlina Elburg, Pieter Vroon, Bas van der Wagt, Arnaud Tchalikian

Research output: Contribution to journalArticlepeer-review

156 Citations (Scopus)

Abstract

Sr isotopic compositions and Rb/Sr ratios of three USGS glasses (BHVO-2G, BIR-1G, BCR-2G) are identical to those of the original USGS reference materials. NKT-1G and TB-1G give values of 0.70351 and 0.70558, respectively. Pb isotopic ratios were measured by the standard-sample bracketing technique on an MC-ICP-MS, which give results that are comparable in accuracy and reproducibility to double spike analyses. However, assessment of the reproducibility of the technique is hampered by inhomogeneous contamination of all USGS reference materials analysed. This contamination is likely to be the reason why the USGS glasses do not all have the same Pb isotopic composition as their unfused originals. Powdered glasses, distributed for characterisation of the glasses by bulk analytical techniques, do not all have the same Pb isotopic compositions as the solid glass material, and can therefore not be used for this purpose.

Original languageEnglish
Pages (from-to)196-207
Number of pages12
JournalChemical Geology
Volume223
Issue number4
DOIs
Publication statusPublished - 30 Nov 2005
Externally publishedYes

Keywords

  • In situ analysis
  • MC-ICP-MS
  • Pb isotopes
  • Sample-standard bracketing
  • Standard reference materials
  • USGS glasses

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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