Mathematics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.539t&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 539-540
Mathematics
Abundance, Bubbles, Isotopic Enrichment, Meteoritic Composition, Rare Gases, Ureilites, Mathematical Models, Porosity, Pyroxenes, Solubility
Scientific paper
The Xe concentration for Yamato-74063 (acapulcoite) bulk is even higher than that for most ureilites. The isotopic composition of Xe, including Xe-129, is homogeneous among bulk, silicate, and metal fractions. Ar-36/Xe-132 is variable: 22, 17, and 72 for bulk, silicate, and metal respectively. Because Ar-36/Xe-132 for metal is equal to that of planetary gas, these indicate heavy elemental fractionation took place at or after noble gas trapping in silicate. Orthopyroxene minerals containing tiny metal spherules contian many voids as well as large amounts of trapped gases. The highest Xe abundance released by a laser shot from such an orthopyroxene grain amounts to 8.5 x 10-7 cu cm Xe-132/g with Ar-36/Xe-132 = 11. I present a model to account for the great enrichment of Xe and the low Ar/Xe with the bubble hypothesis. For simplicity, we assume all noble gases were trapped via solution in silicates (Henry's law) and occlusion in microbubbles. The local Xe abundance increases in proportion to the local bubble density (vL/W). The local Ar/Xe decreases very rapidly with the increasing local bubble density and approaches Ar/Xe in bubbles. With the Ar solubility for enstatite, the Xe solubility inferred from the relationship between ionic porosity and SXe/SAr and TAr = 873 K and TXe = 1135 K tentatively, the local Xe abundance is C(Xe)(1 + 8 x 104 vL/W), and the local Ar/Xe approaches 0.20R (R = Ar/Xe for bulk).
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