Other
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..38..407d&link_type=abstract
Earth and Planetary Science Letters, vol. 38, no. 2, Feb. 15, 1978, p. 407-415.
Other
3
Apollo 16 Flight, Breccia, Feldspars, Lunar Evolution, Lunar Rocks, Lunar Composition, Lunar Crust, Planetary Evolution, Ages, Argon/Argon, Evolution, Moon, Apollo 16, 67435, Breccias, Plagioclase, Samples, Lunar
Scientific paper
A Ar-40 Ar-39 study of the Apollo 16 breccia 67435 and present ages of five samples representing matrix, lithic clasts and plagioclase clasts is reported. While the matrix age spectrum does not have a well-defined plateau, the two lithic clasts gave plateau ages of 3.96 and 4.04 AE. Since all samples had apparent ages of approximately 1 AE in the fractions less than or equal to 600 C extraction temperature, the breccia might have been assembled in a rather mild process at about that time or even more recently out of material with different metamorphic ages. The two plagioclase samples, of which one was a single 9-mg mineral clast and the other a 15-mg composite of several clasts, also have ages of approximately 1 AE in the low-temperature release fractions, but are apparently undisturbed by any approximately 4-AE events since they both have well-defined plateaux at 4.42 AE. The age of these strongly calcic plagioclase clasts, believed to be remnants of the anorthositic lunar crust, establishes a lower age limit to the end of the early lunar differentiation and thus places a strong constraint to the lunar evolution.
Dominik B.
Jessberger Elmar
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