Zircon M127 – A Homogeneous Reference Material for SIMS U–Pb Geochronology Combined with Hafnium, Oxygen and, Potentially, Lithium Isotope Analysis

Lutz Nasdala, Fernando Corfu, John W. Valley, Michael J. Spicuzza, Fu Yuan Wu, Qiu Li Li, Yue Heng Yang, Chris Fisher, Carsten Münker, Allen K. Kennedy, Peter W. Reiners, Andreas Kronz, Michael Wiedenbeck, Richard Wirth, Chutimun Chanmuang, Manuela Zeug, Tamás Váczi, Nicholas Norberg, Tobias Häger, Alfred KrönerWolfgang Hofmeister

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

In this article, we document a detailed analytical characterisation of zircon M127, a homogeneous 12.7 carat gemstone from Ratnapura, Sri Lanka. Zircon M127 has TIMS-determined mean U–Pb radiogenic isotopic ratios of 0.084743 ± 0.000027 for 206Pb/238U and 0.67676 ± 0.00023 for 207Pb/235U (weighted means, 2s uncertainties). Its 206Pb/238U age of 524.36 ± 0.16 Ma (95% confidence uncertainty) is concordant within the uncertainties of decay constants. The δ18O value (determined by laser fluorination) is 8.26 ± 0.06‰ VSMOW (2s), and the mean 176Hf/177Hf ratio (determined by solution ICP-MS) is 0.282396 ± 0.000004 (2s). The SIMS-determined δ7Li value is −0.6 ± 0.9‰ (2s), with a mean mass fraction of 1.0 ± 0.1 μg g−1 Li (2s). Zircon M127 contains ~ 923 μg g−1 U. The moderate degree of radiation damage corresponds well with the time-integrated self-irradiation dose of 1.82 × 1018 alpha events per gram. This observation, and the (U–Th)/He age of 426 ± 7 Ma (2s), which is typical of unheated Sri Lankan zircon, enable us to exclude any thermal treatment. Zircon M127 is proposed as a reference material for the determination of zircon U–Pb ages by means of SIMS in combination with hafnium and stable isotope (oxygen and potentially also lithium) determination.

Original languageEnglish (US)
Pages (from-to)457-475
Number of pages19
JournalGeostandards and Geoanalytical Research
Volume40
Issue number4
DOIs
StatePublished - Dec 1 2016

Keywords

  • SIMS
  • U–Pb geochronology
  • hafnium isotopes
  • lithium isotopes
  • oxygen isotopes
  • reference material
  • zircon

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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    Nasdala, L., Corfu, F., Valley, J. W., Spicuzza, M. J., Wu, F. Y., Li, Q. L., Yang, Y. H., Fisher, C., Münker, C., Kennedy, A. K., Reiners, P. W., Kronz, A., Wiedenbeck, M., Wirth, R., Chanmuang, C., Zeug, M., Váczi, T., Norberg, N., Häger, T., ... Hofmeister, W. (2016). Zircon M127 – A Homogeneous Reference Material for SIMS U–Pb Geochronology Combined with Hafnium, Oxygen and, Potentially, Lithium Isotope Analysis. Geostandards and Geoanalytical Research, 40(4), 457-475. https://doi.org/10.1111/ggr.12123