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Gas retention and cosmic-ray exposure ages of a basalt fragment from Mare Fecunditatis. (1972)

Wasserburg, G. J. ; Podosek, F. A. ; Huneke, J. C.

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Publication Date: 2019-06-27

Description: The Ar40-Ar39 gas retention age and the Ar38-Ar37 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 a large low-temperature loss of radiogenic Ar40 but defines a reasonably good high-temperature plateau at 3.45 plus or minus 0.04 b.y. This is presumed to identify the period of igneous activity in Mare Fecunditatis. This activity is found to be later than that in the area of Mare Tranquilitatis, but earlier than that in the area of Oceanus Procellarum and Mare Imbrium. The cosmic-ray exposure age was found to be 475 m.y.

Keywords: SPACE SCIENCES

Type: Earth and Planetary Science Letters; 13; Jan. 197

Format: text

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