Evidence for a ~ 4.5 aeon age of plagioclase clasts in a lunar highland breccia

Details Evidence for a ~ 4.5 aeon age of plagioclase clasts in a lunar highland breccia Evidence for a ~ 4.5 aeon age of plagioclase clasts in a lunar highland breccia

Mar 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.248..199j&link_type=abstract

Nature, Volume 248, Issue 5445, pp. 199-202 (1974).

Computer Science

8

Scientific paper

Argon from neutron-irradiated mineral separates and whole rock samples of a metamorphosed breccia (65015) from Apollo 16 has been analysed with a large number of gas extraction steps in order to obtain a high resolution in the apparent ages and to identify the gas released from different sources. The results on plagioclase show a 40Ar-39Ar plateau age of 3.98 × 109 yr, which we attribute to the time of metamorphism, and an age of ~ 4.5 × 109 yr in the high temperature fraction. Correlation of the release pattern with 37Ar instead of 39Ar permits the association of the ~4.5 × 109 yr age with relict plagioclasts which were demonstrated in previous petrographic and Rb-Sr studies as being unequilibrated. This result suggests that it is possible to identify lithic components which represent the early lunar crust.

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