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Nickel Isotope Variations in Terrestrial Silicate Rocks and Geological Reference Materials Measured by MC ‐ ICP ‐ MS
Author(s) -
Gueguen Bleuenn,
Rouxel Olivier,
Ponzevera Emmanuel,
Bekker Andrey,
Fouquet Yves
Publication year - 2013
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/j.1751-908x.2013.00209.x
Subject(s) - isotope , silicate , geology , igneous rock , mineralogy , geochemistry , analytical chemistry (journal) , chemistry , mass spectrometry , environmental chemistry , chromatography , physics , organic chemistry , quantum mechanics
Although initial studies have demonstrated the applicability of N i isotopes for cosmochemistry and as a potential biosignature, the N i 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 N i isotope determination, (b) to determine the N i isotope composition of various geological reference materials, (c) to assess the isotope composition of the B ulk S ilicate E arth relative to the N i isotope reference material NIST SRM 986 and (d) to report the range of mass‐dependent N i isotope fractionations in magmatic rocks and ore deposits. After purification through a two‐stage chromatography procedure, N i 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‰ (2 s ). Igneous‐ and mantle‐derived rocks displayed a restricted range of δ 60/58 N i 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 N i‐rich sulfides varied from −0.10 to −1.03‰.