ArticlesAbundance of Major Elements

Solar Wind Gases, Cosmic Ray Spallation Products, and the Irradiation History

Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 548-550
DOI: 10.1126/science.167.3918.548

Abstract

The isotopic abundances of the rare gases in the fines are found to be similar to those previously reported for gas-rich meteorites. Relative to the heavy gases, neon and helium are depleted by factors of 2.5 and 10 respectively. Accurate krypton-krypton ages for rocks 10017, 10047, 10057, and 10071 were obtained covering a range of from 47 to 509 x 106 years. Varying relative production rates of the krypton and xenon isotopes in these rocks suggest different irradiation conditions and a complex history for at least some of the rocks.

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