An Inter-Laboratory Assessment of the Thorium Isotopic Composition of Synthetic and Rock Reference Materials |
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| Authors: | Kenneth WW Sims James B Gill Anthony Dosseto Dirk L Hoffmann Craig C Lundstrom Ross W Williams Lary Ball Darren Tollstrup Simon Turner Julie Prytulak Justin JG Glessner JJ Standish Tim Elliott |
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| Institution: | 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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