Rutile R632 – A New Natural Reference Material for U‐Pb and Zr Determination |
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| Authors: | Emelie Axelsson Jonas Pape Jasper Berndt Fernando Corfu Klaus Mezger Michael M Raith |
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| Affiliation: | 1. Institute of Geological Sciences, University of Bern, Bern, Switzerland;2. Department of Geological Sciences, Stockholm University, Stockholm, Sweden;3. Institut für Mineralogie, University of Münster, Münster, Germany;4. Department of Geosciences, University of Oslo, Oslo, Norway;5. Steinmann Institut, University of Bonn, Bonn, Germany |
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| Abstract: | A new natural rutile reference material is presented, suitable for U‐Pb dating and Zr‐in‐rutile thermometry by microbeam methods. U‐Pb dating of rutile R632 using laser ablation ICP‐MS with both magnetic sector field and quadrupole instruments as well as isotope dilution‐thermal ionisation mass spectrometry yielded a concordia age of 496 ± 2 Ma. The high U content (> 300 μg g?1) enabled measurement of high‐precision U‐Pb ages despite its young age. The sample was found to have a Zr content of 4294 ± 196 μg g?1, which makes it an excellent complementary reference material for Zr‐in‐rutile thermometry. Individual rutile grains have homogeneous compositions of a number of other trace elements including V, Cr, Fe, Nb, Mo, Sn, Sb, Hf, Ta and W. This newly characterised material significantly expands the range of available rutile reference materials relevant for age and temperature determinations. |
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| Keywords: | rutile reference material U‐Pb geochronology Zr‐in‐rutile thermometry trace element mass fractions |
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