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

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Authors
Nasdala, L.
Corfu, F.
Valley, J.
Spicuzza, M.
Wu, F.
Li, Q.
Yang, Y.
Fisher, C.
Münker, C.
Kennedy, Allen
Reiners, P.
Kronz, A.
Wiedenbeck, M.
Wirth, R.
Chanmuang, C.
Zeug, M.
Váczi, T.
Norberg, N.
Häger, T.
Kröner, A.
Hofmeister, W.
Date
2016
Type
Journal Article

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Nasdala, L. and Corfu, F. and Valley, J. and Spicuzza, M. and Wu, F. and Li, Q. and Yang, Y. et al. 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): pp. 457-475.
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Geostandards and Geoanalytical Research
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Department of Physics and Astronomy
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This is the peer reviewed version of the following article: Nasdala, L. and Corfu, F. and Valley, J. and Spicuzza, M. and Wu, F. and Li, Q. and Yang, Y. et al. 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): pp. 457-475., which has been published in final form at http://doi.org/10.1111/ggr.12123. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving at http://olabout.wiley.com/WileyCDA/Section/id-820227.html#terms

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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 d18O 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 d7Li 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.