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Heterogeneous distribution of 60Fe in the early solar nebula: Achondrite evidence

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Abstract

60Fe-60Ni systematics in quenched angrites and two old eucrites were investigated by secondary ion mass spectrometry. The 60Ni/62Ni isotopic compositions were normal within 2σ errors. The inferred initial 60Fe/56Fe ratios for quenched angrites was (6±9)× 10−9, and similar upper limit values were also obtained from eucrites. Using the age difference of approximately 5 Ma between the quenched angrites and Ca−Al-rich inclusions, the initial 60Fe/56Fe ratio at the start of the solar system was calculated to be approximately (6±9)× 10−8. This initial ratio is significantly smaller than previously published values obtained from chondritic materials, suggesting the heterogeneous distribution of 60Fe in the solar nebula.

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Correspondence to Naoji Sugiura.

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Sugiura, N., Miyazaki, A. & Yin, Q. Heterogeneous distribution of 60Fe in the early solar nebula: Achondrite evidence. Earth Planet Sp 58, 1079–1086 (2006) doi:10.1186/BF03352613

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Key words

  • Solar nebula
  • 60Fe
  • angrite
  • eucrite
  • SIMS
  • age