Zircon M257 ‐ a Homogeneous Natural Reference Material for the Ion Microprobe U‐Pb Analysis of Zircon

Geostandards and Geoanalytical Research - Tập 32 Số 3 - Trang 247-265 - 2008
Lutz Nasdala1, Wolfgang Hofmeister2, Nicholas Norberg1,3, J. Martinson4, Fernando Corfú5, Wolfgang Dörr6,7, Sandra L. Kamo8, Allen Kennedy9, Andreas Kronz10, Peter W. Reiners11, Dirk Frei12, Jan Košler13, Yusheng Wan14, Jens Götze15, Tobias Häger2, Alfred Kröner14,2, John W. Valley16
1Institut für Mineralogie und Kristallographie, Universität Wien, Althanstr. 14, A-1090 Wien, Austria
2Institut für Geowissenschaften, Johannes Gutenberg-Universität, Becherweg 21, D-55099 Mainz, Germany
3Sektion 4.1, Helmholtz-Zentrum Potsdam, Deutsches Geoforschungszentrum, D-14473 Potsdam, Germany
4Department of Earth Science, University of California, Santa Barbara, CA 93106, USA
5Department of Geosciences, University of Oslo, Postbox 1047 Blindern, N-0316 Oslo, Norway
6Geozentrum, Johann-Wolfgang-Goethe-Universität, Altenhöferallee 1, D-60438 Frankfurt, Germany
7Institut für Geowissenschaften und Lithosphärenforschung, Justus-Liebig-Universität, D-35390 Gießen, Germany
8Jack Satterly Geochronology Laboratory, Department of Geology, University of Toronto, 22 Russell St., Toronto, Ontario, M5S 3B1, Canada
9Department of Imaging and Applied Physics, Curtin University of Technology, Kent St., Bentley, 6102, Western Australia
10Geowissenschaftliches Zentrum, Universität Göttingen, Goldschmidtstrasse 1, D-37077 Göttingen, Germany
11Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA
12Department of Geological Mapping, Geological Survey of Denmark and Greenland, Oster Voldgade 10, DK-1350 Copenhagen K, Denmark
13Department of Earth Science, University of Bergen, Allegaten 41, N-5007 Bergen, Norway
14Beijing SHRIMP Center, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, 100037 Beijing, China
15Institut für Mineralogie, TU Bergakademie Freiberg, Brennhausgasse 14, D-09596 Freiberg, Germany
16Department of Geology & Geophysics, University of Wisconsin, Madison, WI 53706, USA

Tóm tắt

We introduce and propose zircon M257 as a future reference material for the determination of zircon U‐Pb ages by means of secondary ion mass spectrometry. This light brownish, flawless, cut gemstone specimen from Sri Lanka weighed 5.14 g (25.7 carats). Zircon M257 has TIMS‐determined, mean isotopic ratios (2s uncertainties) of 0.09100 ± 0.00003 for 206pb/238U and 0.7392 ± 0.0003 for 207pb/235U. Its 206pb/238U age is 561.3 ± 0.3 Ma (unweighted mean, uncertainty quoted at the 95% confidence level); the U‐Pb system is concordant within uncertainty of decay constants. Zircon M257 contains ∼ 840 μg g−1 U (Th/U ∼ 0.27). The material exhibits remarkably low heterogeneity, with a virtual absence of any internal textures even in cathodoluminescence images. The uniform, moderate degree of radiation damage (estimated from the expansion of unit‐cell parameters, broadening of Raman spectral parameters and density) corresponds well, within the “Sri Lankan trends”, with actinide concentrations, U‐Pb age, and the calculated alpha fluence of 1.66 × 1018 g−1. This, and a (U+Th)/He age of 419 ± 9 Ma (2s), enables us to exclude any unusual thermal history or heat treatment, which could potentially have affected the retention of radiogenic Pb. The oxygen isotope ratio of this zircon is 13.9%o VSMOW suggesting a metamorphic genesis in a marble or calc‐silicate skarn.

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Geostandards and Geoanalytical Research

Tập 32 Số 3

247-265

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