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Earth, Planets and Space

, Volume 58, Issue 8, pp 1079–1086

First Online: 16 September 2006Received: 02 December 2005Revised: 15 April 2006Accepted: 20 April 2006

Abstract

Fe-Ni systematics in quenched angrites and two old eucrites were investigated by secondary ion mass spectrometry. The Ni-Ni isotopic compositions were normal within 2σ errors. The inferred initial Fe-Fe ratios for quenched angrites was 6±9× 10, 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 Fe-Fe ratio at the start of the solar system was calculated to be approximately 6±9× 10. This initial ratio is significantly smaller than previously published values obtained from chondritic materials, suggesting the heterogeneous distribution of Fe in the solar nebula.

Key wordsSolar nebula Fe angrite eucrite SIMS age  Download to read the full article text



Autor: Naoji Sugiura - Akiko Miyazaki - Qing-zhu Yin

Fuente: https://link.springer.com/



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