title: Solar wind gases, cosmic ray spallation products, and the irradiation history.
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 10(6) 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.
authors.forename: K
authors.initials: K
authors.lastname: Marti
authors.forename: G W
authors.initials: GW
authors.lastname: Lugmair
authors.forename: H C
authors.initials: HC
authors.lastname: Urey