Nickel isotopic anomalies in troilite from iron meteorites

We measured nickel isotopes, via multicollector inductively coupled plasma mass spectrometry (MC‐ICPMS), in troilite (FeS) from ten iron meteorites from both non‐magmatic (IAB) and magmatic (IIAB, IIIAB, IVA) groups. These are the first reported measurements of 64Ni (the least abundant Ni isotope) i...

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Bibliographic Details
Published in:Geophysical research letters 2008-01, Vol.35 (1), p.n/a
Main Authors: Cook, David L., Clayton, Robert N., Wadhwa, Meenakshi, Janney, Philip E., Davis, Andrew M.
Format: Article
Language:English
Subjects:
cosmochemistry
nickel
troilite
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Summary:We measured nickel isotopes, via multicollector inductively coupled plasma mass spectrometry (MC‐ICPMS), in troilite (FeS) from ten iron meteorites from both non‐magmatic (IAB) and magmatic (IIAB, IIIAB, IVA) groups. These are the first reported measurements of 64Ni (the least abundant Ni isotope) in meteoritic sulfides. No excesses of 60Ni from the decay of the short‐lived radionuclide 60Fe (t1/2 = 1.49 My) were found in any of the samples. Resolvable deficits in 60Ni were observed in five samples. These deficits are inconsistent with the effects from 60Fe decay, given the Fe/Ni ratios in these troilites. Also, variations were found in 61Ni and 64Ni in several samples. The variations in Ni isotopic compositions of these samples may be due to the preservation of a component within the troilite that is characterized by the nucleosynthetic signature expected for Ni produced either by a type II supernova or by an AGB star.
ISSN:0094-8276
1944-8007
DOI:10.1029/2007GL032431