Open Access

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

Earth, Planets and Space200658:BF03352613

https://doi.org/10.1186/BF03352613

Received: 2 December 2005

Accepted: 20 April 2006

Published: 16 September 2006

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.

Key words

Solar nebula 60FeangriteeucriteSIMSage