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Gas retention and cosmic-ray exposure ages of a basalt fragment from Mare Fecunditatis

Huneke, J. C. and Podosek, F. A. and Wasserburg, G. J. (1972) Gas retention and cosmic-ray exposure ages of a basalt fragment from Mare Fecunditatis. Earth and Planetary Science Letters, 13 (2). pp. 375-383. ISSN 0012-821X. doi:10.1016/0012-821x(72)90112-4.

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An ⁴⁰Ar-³⁹Ar gas retention age and an ³⁸Ar-³⁷Ar cosmic ray exposure age have been determined on a total rock sample of the basalt fragment B-1 returned from Mare Fecunditatis by the Luna 16 mission. This sample shows large low-temperature loss of radiogenic ⁴⁰Ar but defines a reasonably good high-temperature plateau at 3.45 ± 0.04 AE. This is presumed to date a period of igneous activity in Mare Fecunditatis. This activity is later than that at Mare Tranquillitatis but earlier than at Oceanus Procellarum and Mare Imbrium. The cosmic ray exposure age is 475 m.y.

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Wasserburg, G. J.0000-0002-7957-8029
Additional Information:We gratefully acknowledge the essential support of Pal Young and A1 Massey. We are indebted to the Academy of Sciences of the USSR for making samples returned by the Luna 16 probe available for general scientific study and to the Lunar Sample Analysis Planning Team for entrusting us with the analysis of the unique fragment B-1. This work was supported by NASA Contract NAS-9-8074 and NSF grant GP-19887.
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Caltech Division of Geological and Planetary Sciences2098
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ID Code:117974
Deposited By: Tony Diaz
Deposited On:28 Nov 2022 19:30
Last Modified:28 Nov 2022 19:30

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