Ar-39 recoil and the apparent persistence of the presolar age of an Allende inclusion

Details Ar-39 recoil and the apparent persistence of the presolar age of an Allende inclusion Ar-39 recoil and the apparent persistence of the presolar age of an Allende inclusion

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..69....1j&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 69, no. 1, July 1984, p. 1-12.

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Argon Isotopes, Meteoritic Composition, Neutron Irradiation, Quartz, Recoil Atoms, Chlorine, Cosmochemistry, Isotope Effect, Potassium, Meteorites, Allende, Argon 39, Ages, Inclusions, Isotopes, Composition, Samples, Meteorite, Procedure, Analysis, Radiogenic Elements, Decay, Dating Techniques

Scientific paper

This is a report on the isotopic composition of argon found in neutron-irradiated quartz ampoules which contain samples of Allende coarse-grained inclusions or aluminum wrap only, and of argon released from one of these inclusions by stepwise heating. Besides atmospheric argon all ampoules contain, with varying concentrations but in constant proportions, Ar-38 from Cl and Ar-39 from K corresponding to Cl/K of about 1. No Ar-39 which has recoiled out of the samples, and no argon which has diffused out of the samples, has been observed in the ampoule gas. The analysis of the isotope variations of argon released by stepwise heating from a sample of inclusion 18 yields an apparent Ar-40-Ar-39 isochron age of 4.85 AE. A reanalysis of argon from another sample of the same inclusion dated earlier yields the same result. Thus inclusion 18 contains more radiogenic Ar-40 than can be accounted for by K-40 decay during 4.53 AE.

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