Nickel isotopic anomalies in troilite from iron meteorites

David L. Cook; Robert N. Clayton; Meenakshi Wadhwa; Philip E. Janney; Andrew M. Davis

doi:10.1029/2007GL032431

Nickel isotopic anomalies in troilite from iron meteorites

David L. Cook, Robert N. Clayton, Meenakshi Wadhwa, Philip E. Janney, Andrew M. Davis

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

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 (t_1/2 = 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.

Original language	English (US)
Article number	L01203
Journal	Geophysical Research Letters
Volume	35
Issue number	1
DOIs	https://doi.org/10.1029/2007GL032431
State	Published - Jan 16 2008

ASJC Scopus subject areas

Geophysics
Earth and Planetary Sciences(all)

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title = "Nickel isotopic anomalies in troilite from iron meteorites",

abstract = "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.",

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T1 - Nickel isotopic anomalies in troilite from iron meteorites

AU - Cook, David L.

AU - Clayton, Robert N.

AU - Wadhwa, Meenakshi

AU - Janney, Philip E.

AU - Davis, Andrew M.

PY - 2008/1/16

Y1 - 2008/1/16

N2 - 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.

AB - 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.

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Nickel isotopic anomalies in troilite from iron meteorites

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