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Title: Iron Isotopic Compositions of Troilite (FeS) Inclusions from Iron Meteorites

Abstract

We report non-mass-dependent Fe isotopic data for troilite (FeS) inclusions from 10 iron meteorites, representing both non-magmatic (IAB) and magmatic groups (IIAB, IIIAB, IVA). No resolvable variations are present in the most neutron-rich isotope ({sup 58}Fe), but small deficits (≈−0.1 ε ) in {sup 56}Fe were observed in several inclusions. With the exception of several Ca–Al-rich inclusions in primitive meteorites, these are the first reported non-mass-dependent variations in Fe isotopes for material formed in the early solar system. Nucleosynthetic variations in Ni isotopes were previously reported in these same samples. The effects in Fe isotopes are not correlated with those in Ni, which suggests that the origins of the isotopic variations are decoupled from one another. The {sup 56}Fe deficits may represent incomplete mixing of the precursor dust in the protoplanetary disk. Alternatively, a parent body process (e.g., irradiation by galactic cosmic rays) may have modified the Fe isotopic compositions of some inclusions, which initially had homogeneous Fe isotopic compositions.

Authors:
;  [1]
  1. Institut für Geochemie und Petrologie, ETH Zürich, Clausiusstrasse 25, 8092 Zürich (Switzerland)
Publication Date:
OSTI Identifier:
22666282
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 154; Journal Issue: 4; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC DUST; COSMIC RADIATION; INCLUSIONS; IRON; IRON 56; IRON 58; IRON METEORITES; IRRADIATION; ISOTOPE RATIO; METEOROIDS; NEUTRON-RICH ISOTOPES; NICKEL ISOTOPES; NUCLEOSYNTHESIS; PROTOPLANETS; SOLAR SYSTEM; TROILITE

Citation Formats

Cook, David L., and Schönbächler, Maria, E-mail: david.cook@erdw.ethz.ch. Iron Isotopic Compositions of Troilite (FeS) Inclusions from Iron Meteorites. United States: N. p., 2017. Web. doi:10.3847/1538-3881/AA8B12.
Cook, David L., & Schönbächler, Maria, E-mail: david.cook@erdw.ethz.ch. Iron Isotopic Compositions of Troilite (FeS) Inclusions from Iron Meteorites. United States. doi:10.3847/1538-3881/AA8B12.
Cook, David L., and Schönbächler, Maria, E-mail: david.cook@erdw.ethz.ch. Sun . "Iron Isotopic Compositions of Troilite (FeS) Inclusions from Iron Meteorites". United States. doi:10.3847/1538-3881/AA8B12.
@article{osti_22666282,
title = {Iron Isotopic Compositions of Troilite (FeS) Inclusions from Iron Meteorites},
author = {Cook, David L. and Schönbächler, Maria, E-mail: david.cook@erdw.ethz.ch},
abstractNote = {We report non-mass-dependent Fe isotopic data for troilite (FeS) inclusions from 10 iron meteorites, representing both non-magmatic (IAB) and magmatic groups (IIAB, IIIAB, IVA). No resolvable variations are present in the most neutron-rich isotope ({sup 58}Fe), but small deficits (≈−0.1 ε ) in {sup 56}Fe were observed in several inclusions. With the exception of several Ca–Al-rich inclusions in primitive meteorites, these are the first reported non-mass-dependent variations in Fe isotopes for material formed in the early solar system. Nucleosynthetic variations in Ni isotopes were previously reported in these same samples. The effects in Fe isotopes are not correlated with those in Ni, which suggests that the origins of the isotopic variations are decoupled from one another. The {sup 56}Fe deficits may represent incomplete mixing of the precursor dust in the protoplanetary disk. Alternatively, a parent body process (e.g., irradiation by galactic cosmic rays) may have modified the Fe isotopic compositions of some inclusions, which initially had homogeneous Fe isotopic compositions.},
doi = {10.3847/1538-3881/AA8B12},
journal = {Astronomical Journal (Online)},
number = 4,
volume = 154,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}