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Relict Refractory Element Rich Phases in Type B CAI

Johnson, M. L. and Burnett, D. S. and Woolum, D. S. (1988) Relict Refractory Element Rich Phases in Type B CAI. Meteoritics, 23 (9). p. 276. ISSN 0026-1114.

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Of the possible processes involved in Type B CAI history, igneous processes are the most tractable for study. Temperature and time scales inferred are commensurate with feasible laboratory simulations. We have previously reported melilite (mel) crystal liquid partition coefficients, Di, for Sm, Yb, Sr (Eu^(++) analog), and Y (Ho analog). Our data for akermanite (Ak) 30 mel compositions is in good agreement with literature data where direct/extrapolated comparisons are possible. Even allowing for significant variations in Di with progressive crystallization, comparisons of predictions for the initial (0-30%) fractional crystallization of mel with our Sr, Y contents obtained for mel cores in Allende Type B CAI, with comparable Ak contents, indicate that the natural data substantially exceed (factors of 1.5-2.5 x) those predicted. Similar results are obtained for Y, Zr in fassaite (fass) based on estimates of the Di from literature data. In this case, excesses of these trace elements are up to factors of about x 5. Thus, while the trace elements observed in natural CAI (Sr in mel and Y, Zr in fass) are in qualitative agreement with igneous partitioning, the trace element abundances are higher than quantitative predictions.

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Burnett, D. S.0000-0001-9521-8675
Additional Information:© 1988 Meteoritical Society. Provided by the NASA Astrophysics Data System.
Issue or Number:9
Record Number:CaltechAUTHORS:20150506-140738836
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Official Citation:Relict Refractory Element Rich Phases in Type B CAI Johnson, M. L., Burnett, D. S., & Woolum, D. S. Meteoritics, Vol. 23, p.276, 1988
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57287
Deposited By: Ruth Sustaita
Deposited On:06 May 2015 22:11
Last Modified:09 Mar 2020 13:18

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