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(60)Fe-(60)Ni systematics in the eucrite parent body: A case study of Bouvante and Juvinas

Ghylaine Quitté 1, 2, * Christopher Latkoczy 3 Maria Schönbächler 2 Alex N. Halliday 2 D. Günther 3
* Corresponding author
1 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon]
2 Institute for Isotope Geology and Mineral Resources
3 Laboratory of Inorganic Chemistry
Abstract : Eucrites are basaltic meteorites that cooled rapidly but are in many instances thermally metamorphosed and impact brecciated. The exact timing of these events remains unclear. In this study, Ni isotopic compositions and Fe/Ni elemental ratios are presented for two non-cumulate eucrites, Bouvante and Juvinas, including mineral separates from the latter. The samples are characterized by variable, well-resolved (60)Ni-excesses consistent with the former presence of live (60)Fe (t(1/2) = 2.62 Ma) at the time of eucrite crystallization. A significant fraction of Ni with a terrestrial-like composition appears to be surface correlated. This Ni may be the product of terrestrial contamination or was introduced by a chondritic impactor during brecciation. Altogether, the data provide evidence for a complex and probably multi-stage history of Fe and/or Ni redistribution, which impedes the interpretation of the chronological data
Keywords : EARLY SOLAR-SYSTEM THERMAL METAMORPHISM FE-60 IRON-60 HISTORY NICKEL HETEROGENEITY TIMESCALES MINERALOGY INCLUSIONS
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https://hal-insu.archives-ouvertes.fr/insu-00683300
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Submitted on : Wednesday, March 28, 2012 - 1:34:55 PM
Last modification on : Tuesday, February 18, 2020 - 3:54:02 PM

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Ghylaine Quitté, Christopher Latkoczy, Maria Schönbächler, Alex N. Halliday, D. Günther. (60)Fe-(60)Ni systematics in the eucrite parent body: A case study of Bouvante and Juvinas. Geochimica et Cosmochimica Acta, Elsevier, 2011, 75 (23), pp.7698-7706. ⟨10.1016/j.gca.2011.09.037⟩. ⟨insu-00683300⟩

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