An Inter-Laboratory Assessment of the Thorium Isotopic Composition of Synthetic and Rock Reference Materials |
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| Authors: | Kenneth W.W. Sims James B. Gill Anthony Dosseto Dirk L. Hoffmann Craig C. Lundstrom Ross W. Williams Lary Ball Darren Tollstrup Simon Turner Julie Prytulak Justin J.G. Glessner J.J. Standish Tim Elliott |
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| Affiliation: | Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, 02543, USA;Earth and Planetary Sciences, University of California, Santa Cruz, CA 95604, USA;GEMOC National Key Centre Macquarie University NSW 2109 Sydney, Australia;Bristol Isotope Group, University of Bristol, Bristol BS8 1RJ, UK;Dept of Geology, University of Illinois Urbana Champaign 1301 W Green St, Urbana Il 61801, USA;Chemical Biology and Nuclear Science Division, Lawrence Livermore National Laboratory, L-231 Livermore, CA 94551, USA;Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, 02543, USA |
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| Abstract: | We present a concerted international effort to cross-calibrate five synthetic Th isotope reference materials (UCSC Th "A", OU Th "U", WUN, IRMM-35 and IRMM-36), and six rock reference materials (UCSC TML, Icelandic ATHO, USGS BCR-2, USGS W-2, USGS BHVO-2, LV18) using multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS). We then compare our new values with a compilation of literature mass spectrometric data for these reference materials and derive recommended "consensus"230Th/232Th values for each. We also present isotope dilution U and Th concentration data for four rock reference materials (UCSC TML, Icelandic ATHO, USGS BCR-2, USGS W-2). |
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| Keywords: | thorium isotope ratios rock reference materials MC-ICP-MS consensus values |
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