Variability of the He3 and Ne21 production rates in ordinary chondrites

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Abstract

Al26 and noble gas contents of 6 ordinary chondrites with He3 Ne21 ratios above 6.0 or below 4.0 are used to infer the variability of the production rates of He3 and Ne21 (PHe3 and PNe21). The ratio of the observed Al26 content to a calculated, normal value is taken as a measure of the change of PNe21 from its normal value. The corresponding change in PHe3 is then computed from the observed He3 Ne21 ratio and an average value of PHe3. According to these calculations which exclude orbital effects, PHe3 will be near the average value in meteorites with high He3 Ne21 ratios, while PNe21 will be about 30 per cent below normal. In meteorites with low He3 Ne21 ratios, PHe3 may be depressed by as much as 25 per cent from normal while PNe21 may be 15-20 per cent above the average.

Original languageEnglish (US)
Pages (from-to)2125-2133
Number of pages9
JournalGeochimica et Cosmochimica Acta
Volume37
Issue number9
DOIs
StatePublished - Sep 1973
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

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