Geostandards and Geoanalytical Research Geostandard Geoanalytic Res 1639-4488 1751-908X 12 2016 40 4 10.1111/ggr.2016.40.issue-4 https://onlinelibrary.wiley.com/toc/1751908x/40/4 Zircon M127 – A Homogeneous Reference Material for <scp>SIMS</scp> U–Pb Geochronology Combined with Hafnium, Oxygen and, Potentially, Lithium Isotope Analysis Lutz Nasdala Institut für Mineralogie und Kristallographie Universität Wien 1090 A Wien Austria Fernando Corfu Department of Geosciences University of Oslo N‐0316 Oslo Norway John W. Valley Department of Geoscience University of Wisconsin Madison WI 53706 USA Michael J. Spicuzza Department of Geoscience University of Wisconsin Madison WI 53706 USA Fu‐Yuan Wu Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Qiu‐Li Li Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Yue‐Heng Yang Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Chris Fisher School of the Environment Washington State University Pullman WA 99164 USA Carsten Münker Institut für Geologie und Mineralogie Universität zu Köln D‐50939 Köln Germany Allen K. Kennedy Department of Imaging and Applied Physics Curtin University of Technology Bentley 6102 Australia Peter W. Reiners Department of Geosciences University of Arizona Tucson AZ 85721 USA Andreas Kronz Geowissenschaftliches Zentrum Georg‐August‐Universität Göttingen D‐37077 Göttingen Germany Michael Wiedenbeck Helmholtz‐Zentrum Potsdam Deutsches GeoForschungsZentrum D‐14473 Potsdam Germany Richard Wirth Helmholtz‐Zentrum Potsdam Deutsches GeoForschungsZentrum D‐14473 Potsdam Germany Chutimun Chanmuang Faculty of Gems Burapha University Chanthaburi 22170 Thailand Manuela Zeug Institut für Mineralogie und Kristallographie Universität Wien 1090 A Wien Austria Tamás Váczi Institut für Mineralogie und Kristallographie Universität Wien 1090 A Wien Austria Nicholas Norberg Institut für Mineralogie und Kristallographie Universität Wien 1090 A Wien Austria Tobias Häger Institut für Geowissenschaften Johannes Gutenberg‐Universität D‐55099 Mainz Germany Alfred Kröner Institut für Geowissenschaften Johannes Gutenberg‐Universität D‐55099 Mainz Germany Beijing SHRIMP Center Chinese Academy of Geological Sciences Beijing 100037 China Wolfgang Hofmeister Institut für Geowissenschaften Johannes Gutenberg‐Universität D‐55099 Mainz Germany

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 206 Pb/ 238 U and 0.67676 ± 0.00023 for 207 Pb/ 235 U (weighted means, 2 s uncertainties). Its 206 Pb/ 238 U age of 524.36 ± 0.16 Ma (95% confidence uncertainty) is concordant within the uncertainties of decay constants. The δ 18 O value (determined by laser fluorination) is 8.26 ± 0.06‰ VSMOW (2 s ), and the mean 176 Hf/ 177 Hf ratio (determined by solution ICP ‐ MS ) is 0.282396 ± 0.000004 (2 s ). The SIMS ‐determined δ 7 Li value is −0.6 ± 0.9‰ (2 s ), with a mean mass fraction of 1.0 ± 0.1 μg g −1 Li (2 s ). 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 × 10 18 alpha events per gram. This observation, and the (U–Th)/He age of 426 ± 7 Ma (2 s ), 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.

Dans cet article, nous documentons une caractérisation analytique détaillée du zircon M127 – une pierre précieuse homogène de 12,7 carats provenant de Ratnapura (Sri Lanka). Les rapports isotopiques radiogéniques moyens U‐Pb dans Zircon M127 déterminés par TIMS sont de 0,084743 ± 0,000027 pour 206 Pb/ 238 U et 0,67676 ± 0,00023 pour 207 Pb/ 235 U (moyennes pondérées, 2 s d'incertitude). L’âge 206 Pb/ 238 U obtenu de 524,36 ± 0,16 Ma (avec un niveau de confiance de 95%) est concordant dans la limite des incertitudes des constantes de désintégration. La valeur δ 18 O (déterminée par fluorination laser) est de 8,26 ± 0,06 ‰ VSMOW (2s), et le rapport moyen 176 Hf/ 177 Hf (déterminé en solution par ICP ‐ MS ) est de 0,282396 ± 0,000004 (2s). La valeur δ 7 Li déterminée par SIMS est de ‐0.6 ± 0,9 ‰ (2 s ), avec une fraction de masse moyenne de 1,0 ± 0,1 μg g −1 Li (2 s ). Le zircon M127 contient ~ 923 μg g −1 U. Le degré modéré de dégâts dus à l'irradiation correspond bien à la dose intégrée dans le temps d'auto‐irradiation de 1,82 x 10 18 d’événements alpha par gramme. Cette observation, et l’âge (U‐Th)/He de 426 ± 7 Ma (2 s ), ce qui est typique d'un zircon du Sri Lanka non chauffé, nous permettent d'exclure tout traitement thermique. Zircon M127 est proposé comme matériau de référence pour la détermination des âges U‐Pb de zircon par SIMS en combinaison avec des analyses sur l'hafnium et des isotopes stables (l'oxygène et éventuellement aussi le lithium).

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