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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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Year:
2016
Type of Publication:
Article
Keywords:
zircon, reference material, SIMS, U–Pb geochronology, oxygen isotopes, hafnium isotopes, lithium isotopes, Zircon, matériau de référence, SIMS, géochronologie U-Pb, isotopes d'oxygène, isotopes du hafnium, isotopes du lithium
Authors:
Nasdala, 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
Journal:
Geostandards and Geoanalytical Research
Volume:
40
Number:
4
Pages:
457-475
ISSN:
1751-908X
BibTex:
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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