Mathematics – Logic
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..921b&link_type=abstract
Meteoritics & Planetary Science, vol. 33, no. 4, pp. 921-935.
Mathematics
Logic
15
Scientific paper
The ages of seven rock fragments from the soil fraction of the Luna 24 core have been determined using a laser 40Ar-39Ar stepped heating technique. The investigated lithologies include fragments of fine-grained ophitic basalt, coarse-grained basalt, metabasalts and a regolith breccia. Most of the samples contain non-radiogenic argon components of variable 36Ar/40Ar composition. These surface-correlated trapped components are predominantly released at low temperature and can be distinguished from volume-correlated radiogenic and cosmogenic components released at higher temperature during stepped heating. Binary mixtures of radiogenic and cosmogenic Ar components give linear correlations on 36Art/40Ar - 39Ar/40Ar diagrams from which the age and 36Ar/40Ar value of trapped Ar can be determined. The ages obtained span a narrow range between 3.18-3.28 Ga with an average of 3.22 ( 0.04 Ga. This is interpreted as being the age of the basalts at the Luna 24 sampling site. Systematic age differences between lithologies were not detected, however a single age of 2.93 Ga obtained from a coarse-grained basalt hints at the possibility of younger volcanism. The results of this work effectively treble the chronological information available for Mare Crisium and are within the range of radiometric age measurements of Luna 24 mare basalts obtained previously.
Burgess Ray
Turner Grenville
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