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Fremdlinge in Leoville and Allende CAI – Clues to Post-Formation Cooling and Alteration

Armstrong, J. T. and Hutcheon, I. D. and Wasserburg, G. J. (1984) Fremdlinge in Leoville and Allende CAI – Clues to Post-Formation Cooling and Alteration. Meteoritics, 19 (4). pp. 186-187. ISSN 0026-1114.

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Fremdlinge are perhaps the most exotic and least understood objects in CAI and their very existence places severe constraints regarding formation and cooling histories of the host CAI. Following the discovery and description of Willy, which appears to be an "Ur-Fremdling" or prototype for smaller Fremdlinge in CAI, we have begun a systematic study of CAI of different petrographic types to see if the Fremdlinge are consistent with a common mode of formation and differing degrees of reprocessing. Fifteen type B I, B2, and compact A CAI from Allende and Leoville were selected. The relative abundance of Fremdlinge varies dramatically among CAI, however some CAI of each type and from each meteorite contain abundant Fremdlinge. The range of phase assemblages and mineral chemistries of Fremdlinge from Allende and Leoville is very similar suggesting that the parent sources for Fremdlinge were quite similar. Chemically and texturally, Fremdlinge grade continuously from complex, heterogeneous Willy-like objects to altered, homogeneous metal nuggets. Some complex Fremdlinge like Willy were found in B1 CAI; none were observed in B2 CAI.

Item Type:Article
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Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1984 Meteoritical Society.
Issue or Number:4
Record Number:CaltechAUTHORS:20140130-094000801
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43570
Deposited By: Tony Diaz
Deposited On:30 Jan 2014 22:18
Last Modified:09 Mar 2020 13:19

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