@article{e19b58b322ff49358d7905c4aecb20b3,
title = "Zircon M127 – A Homogeneous Reference Material for SIMS U–Pb Geochronology Combined with Hafnium, Oxygen and, Potentially, Lithium Isotope Analysis",
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.",
keywords = "SIMS, U–Pb geochronology, hafnium isotopes, lithium isotopes, oxygen isotopes, reference material, zircon",
author = "Lutz Nasdala and Fernando Corfu and Valley, {John W.} and Spicuzza, {Michael J.} and Wu, {Fu Yuan} and Li, {Qiu Li} and Yang, {Yue Heng} and Chris Fisher and Carsten M{\"u}nker and Kennedy, {Allen K.} and Reiners, {Peter W.} and Andreas Kronz and Michael Wiedenbeck and Richard Wirth and Chutimun Chanmuang and Manuela Zeug and Tam{\'a}s V{\'a}czi and Nicholas Norberg and Tobias H{\"a}ger and Alfred Kr{\"o}ner and Wolfgang Hofmeister",
note = "Funding Information: This article is dedicated to Jan Ko{\v s}ler (University of Bergen, Norway), who passed away in 2014 at the age of 49. Jan was involved in the initial characterisation of zircon M127. Gem zircon M127 was made available by the Institut f{\"u}r Edelsteinforschung Idar-Oberstein, Germany. Thanks are due to A. Wagner and U. Dittmann for sample preparation. We are indebted to U. Chowdhury, F. Couffignal, G. Giester, A. Kidane, J. Ko{\v s}ler (deceased), K. Scheidl and J. Sl{\'a}ma for experimental assistance and to O. Appelt and U. Schaltegger for data and helpful discussions. Synthetic zircon, hafnon, thorite and uranium oxide crystals were provided as EPMA calibrants by J.M. Hanchar. The Penglai zircon was provided by X.-H. Li. Constructive comments by two anonymous reviewers and editor T. Meisel helped to improve the manuscript. Financial support by the Faculty of Geosciences, Geography and Astronomy, University of Vienna, and the Beijing SHRIMP Centre, Chinese Academy of Geological Sciences, is gratefully acknowledged. Partial funding of this research was provided by the European Commission through contract no. MEXC-CT-2005-024878 to L.N., by the FWF Austrian Science Fund through grants P20028-N10 and P24448-N19 to L.N. and by the U.S. National Science Foundation, EAR 1524336 to J.W.V. Publisher Copyright: {\textcopyright} 2016 The Authors. Geostandards and Geoanalytical Research {\textcopyright} 2016 International Association of Geoanalysts",
year = "2016",
month = dec,
day = "1",
doi = "10.1111/ggr.12123",
language = "English (US)",
volume = "40",
pages = "457--475",
journal = "Geostandards and Geoanalytical Research",
issn = "1639-4488",
publisher = "Wiley-Blackwell",
number = "4",
}