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  • Article
  • Open Access

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

Earth, Planets and Space200658:BF03352613

  • Received: 2 December 2005
  • Accepted: 20 April 2006
  • Published:


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.

Key words

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