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

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 Pb-206/U-238 and 0.67676 +/- 0.00023 for Pb-207/U-235 (weighted means, 2s uncertainties). Its Pb-206/U-238 age of 524.36 +/- 0.16 Ma (95% confidence uncertainty) is concordant within the uncertainties of decay constants. The delta O-18 value (determined by laser fluorination) is 8.26 +/- 0.06 parts per thousand VSMOW (2s), and the mean Hf-176/Hf-177 ratio (determined by solution ICP-MS) is 0.282396 +/- 0.000004 (2s). The SIMS-determined delta Li-7 value is -0.6 +/- 0.9 parts per thousand (2s), with a mean mass fraction of 1.0 +/- 0.1 mu g g(-1) Li (2s). Zircon M127 contains similar to 923 mu g g(-1) U. The moderate degree of radiation damage corresponds well with the time-integrated self-irradiation dose of 1.82 x 10(18) 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.

Identiferoai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/621937
Date12 1900
CreatorsNasdala, Lutz, Corfu, Fernando, Valley, John W., Spicuzza, Michael J., Wu, Fu-Yuan, Li, Qiu-Li, Yang, Yue-Heng, Fisher, Chris, Münker, Carsten, Kennedy, Allen K., Reiners, Peter W., Kronz, Andreas, Wiedenbeck, Michael, Wirth, Richard, Chanmuang, Chutimun, Zeug, Manuela, Váczi, Tamás, Norberg, Nicholas, Häger, Tobias, Kröner, Alfred, Hofmeister, Wolfgang
ContributorsUniversity of Arizona, Institut für Mineralogie und Kristallographie; Universität Wien; 1090 A Wien Austria, Department of Geosciences; University of Oslo; N-0316 Oslo Norway, Department of Geoscience; University of Wisconsin; Madison WI 53706 USA, Department of Geoscience; University of Wisconsin; Madison WI 53706 USA, Institute of Geology and Geophysics; Chinese Academy of Sciences; Beijing 100029 China, Institute of Geology and Geophysics; Chinese Academy of Sciences; Beijing 100029 China, Institute of Geology and Geophysics; Chinese Academy of Sciences; Beijing 100029 China, School of the Environment; Washington State University; Pullman WA 99164 USA, Institut für Geologie und Mineralogie; Universität zu Köln; D-50939 Köln Germany, Department of Imaging and Applied Physics; Curtin University of Technology; Bentley 6102 Australia, Department of Geosciences; University of Arizona; Tucson AZ 85721 USA, Geowissenschaftliches Zentrum; Georg-August-Universität Göttingen; D-37077 Göttingen Germany, Helmholtz-Zentrum Potsdam; Deutsches GeoForschungsZentrum; D-14473 Potsdam Germany, Helmholtz-Zentrum Potsdam; Deutsches GeoForschungsZentrum; D-14473 Potsdam Germany, Faculty of Gems; Burapha University; Chanthaburi 22170 Thailand, Institut für Mineralogie und Kristallographie; Universität Wien; 1090 A Wien Austria, Institut für Mineralogie und Kristallographie; Universität Wien; 1090 A Wien Austria, Institut für Mineralogie und Kristallographie; Universität Wien; 1090 A Wien Austria, Institut für Geowissenschaften; Johannes Gutenberg-Universität; D-55099 Mainz Germany, Institut für Geowissenschaften; Johannes Gutenberg-Universität; D-55099 Mainz Germany, Institut für Geowissenschaften; Johannes Gutenberg-Universität; D-55099 Mainz Germany
PublisherWILEY-BLACKWELL
Source SetsUniversity of Arizona
LanguageEnglish
Detected LanguageEnglish
TypeArticle
Rights© 2016 The Authors. Geostandards and Geoanalytical Research © 2016 International Association of Geoanalysts
Relationhttp://doi.wiley.com/10.1111/ggr.12123

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