Xe and Kr analyses of silicate inclusions from iron meteorites

Details Xe and Kr analyses of silicate inclusions from iron meteorites Xe and Kr analyses of silicate inclusions from iron meteorites

Dec 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35.1231b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 35, Issue 12, pp.1231-1254

Computer Science

13

Scientific paper

The Xe and Kr contents of silicate inclusions from the iron meteorites Copiapo, Four Corners, Linwood, Pine River, Weekeroo Station and Woodbine ( Xe 132 = 3-40, Kr 84 = 5-100 × 10 9 atoms / g ; Kr 84 / Xe 132 = 2) are comparable to chondritic values. The isotopic compositions show trapped gas of both chondritic composition (dominant in Pine River) and atmospheric composition (dominant in Linwood). Large spallation effects ( Kr sp 84 = 4 × 10 9 , Xe sp 126 = 2 × 10 8 atoms / g ) occur in Weekeroo Station and Four Corners. The spallation Xe and Kr spectra in Weekeroo differ from those reported for stone meteorites. A re-analysis of literature data shows that systematic variations also exist among stone meteorite spallation spectra which can be qualitatively understood in terms of target element abundance and shielding variations. Very large neutron capture effects on Br and I occur in several meteorites ( Kr 80 / Kr 83 / Kr 86 = 100/2/3 × 10 10 atoms / g in Linwood). The ( Kr 80 / Kr 82 ) n 2·8 ratios from neutron capture on Br for Linwood and Copiapo are distinct from that found in stone meteorites. All samples have pronounced Xe 129 excesses (3-50 × 10 9 atoms / g ) which apparently indicate differences in formation times from chondrites of less than about 10 8 yr; however, the presence of trapped Xe 132 in silicates which were enclosed in molten Fe-Ni and cooled slowly prove that they were not entirely outgassed; thus, some of the Xe 129 excess may also be trapped. No discernable fission Xe was observed.

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