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: | 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 Kröner Wolfgang Hofmeister |
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| Affiliation: | 1. Institut für Mineralogie und Kristallographie, Universit?t Wien, Wien, Austria;2. Department of Geosciences, University of Oslo, Oslo, Norway;3. Department of Geoscience, University of Wisconsin, Madison, WI, USA;4. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;5. School of the Environment, Washington State University, Pullman, WA, USA;6. Institut für Geologie und Mineralogie, Universit?t zu K?ln, K?ln, Germany;7. Department of Imaging and Applied Physics, Curtin University of Technology, Bentley, Australia;8. Department of Geosciences, University of Arizona, Tucson, AZ, USA;9. Geowissenschaftliches Zentrum, Georg‐August‐Universit?t G?ttingen, G?ttingen, Germany;10. Helmholtz‐Zentrum Potsdam, Deutsches GeoForschungsZentrum, Potsdam, Germany;11. Faculty of Gems, Burapha University, Chanthaburi, Thailand;12. Institut für Geowissenschaften, Johannes Gutenberg‐Universit?t, Mainz, Germany;13. Beijing SHRIMP Center, Chinese Academy of Geological Sciences, Beijing, China |
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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 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. |
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| Keywords: | zircon reference material
SIMS
U– Pb geochronology oxygen isotopes hafnium isotopes lithium isotopes Zircon maté riau de ré fé rence
SIMS
gé ochronologie U‐Pb isotopes d'oxygè ne isotopes du hafnium isotopes du lithium |
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