Nickel Isotope Variations in Terrestrial Silicate Rocks and Geological Reference Materials Measured by MC-ICP-MSReport as inadecuate




Nickel Isotope Variations in Terrestrial Silicate Rocks and Geological Reference Materials Measured by MC-ICP-MS - Download this document for free, or read online. Document in PDF available to download.

* Corresponding author 1 LDO - Domaines Océaniques 2 GM - Unité de recherche Géosciences Marines Ifremer 3 Department of Geological Sciences

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‰.

Keywords : nickel stable isotopes MC-ICP-MS geological reference materials Bulk Silicate Earth abiotic fractionation





Author: Bleuenn Gueguen - Olivier Rouxel - Emmanuel Ponzevera - Andrey Bekker - Yves Fouquet -

Source: https://hal.archives-ouvertes.fr/



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