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Correlated Isotope Fractionation and Formation of Purple FUN Inclusions

Authors
  • Brigham, C. A.
  • Hutcheon, I. D.
  • Papanastassiou, D. A.
  • Wasserburg, G. J.
Publication Date
Sep 01, 1988
Source
Caltech Authors
License
Unknown
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Abstract

Allende coarse-grained inclusions characterized by a distinct purple color and high spinel contents (≤ 50 vol.%) exhibit a higher frequency of FUN isotopic anomalies (≈20%) than the general CAI population (≤6%). We used the ion microprobe to measure Mg, Si, Cr and Fe isotopic compositions of three Purple Spinel-rich Inclusions (PSI = ψ) which are petrographically similar to Type B CAl to investigate: 1) variations in isotopic fractionation within inclusions, including secondary phases; 2) correlated isotopic fractionation; and 3) excess ^(26)Mg.

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