Nickel Isotope Variations in Terrestrial Silicate Rocks and Geological Reference Materials Measured by MC‐ICP‐MS |
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Authors: | Bleuenn Gueguen Olivier Rouxel Emmanuel Ponzevera Andrey Bekker Yves Fouquet |
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Affiliation: | 1. Institut Universitaire Européen de la Mer, UMR 6538, Université de Bretagne Occidentale, , F‐29280 Plouzané, France;2. IFREMER, Centre de Brest, Unité Géosciences Marines, , 29280 Plouzané, France;3. Department of Geological Sciences, University of Manitoba, , Winnipeg, R3T 2N2 Canada |
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Abstract: | Although initial studies have demonstrated the applicability of Ni isotopes for cosmochemistry and as a potential biosignature, the Ni isotope composition of terrestrial igneous and sedimentary rocks, and ore deposits remains poorly known. Our contribution is fourfold: (a) to detail an analytical procedure for Ni isotope determination, (b) to determine the Ni isotope composition of various geological reference materials, (c) to assess the isotope composition of the Bulk Silicate Earth relative to the Ni isotope reference material NIST SRM 986 and (d) to report the range of mass‐dependent Ni isotope fractionations in magmatic rocks and ore deposits. After purification through a two‐stage chromatography procedure, Ni isotope ratios were measured by MC‐ICP‐MS and were corrected for instrumental mass bias using a double‐spike correction method. Measurement precision (two standard error of the mean) was between 0.02 and 0.04‰, and intermediate measurement precision for NIST SRM 986 was 0.05‰ (2s). Igneous‐ and mantle‐derived rocks displayed a restricted range of δ60/58Ni values between ?0.13 and +0.16‰, suggesting an average BSE composition of +0.05‰. Manganese nodules (Nod A1; P1), shale (SDO‐1), coal (CLB‐1) and a metal‐contaminated soil (NIST SRM 2711) showed positive values ranging between +0.14 and +1.06‰, whereas komatiite‐hosted Ni‐rich sulfides varied from ?0.10 to ?1.03‰. |
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Keywords: | nickel stable isotopes MC‐ICP‐MS geological reference materials Bulk Silicate Earth abiotic fractionation nickel isotopes stables MC‐ICP‐MS maté riaux gé ologiques de ré fé rence Terre Silicaté e Globale fractionnement abiotique |
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