Computer Science
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..38..401s&link_type=abstract
Earth and Planetary Science Letters, vol. 38, no. 2, Feb. 15, 1978, p. 401-406. Research supported by the Centre National de la
Computer Science
3
Abundance, Argon Isotopes, Fragments, Lunar Maria, Lunar Rocks, Lunar Composition, Lunar Exploration, Lunar Landing Sites, Lunik Lunar Probes, Moon, Crisium, Mare, Systematics, Argon, Isotopic Ratios, Luna 24, Evolution, Samples, Lunar, 24096, Age, Dating Methods
Scientific paper
Two small fragments, L24B, a glass-rich agglutinate (1.9 mg) and L24A, a fine-grained lithic fragment (9.4 mg), from the Luna 24 landing site have been neutron irradiated for the purpose of Ar-39 Ar-40 dating. A fairly well-defined Ar-39 Ar-40 plateau age of 3.65 plus or minus 0.12 AE was found for the larger fragment. After appropriate corrections the composition of the trapped and spallogenic Ar could be deciphered. The evolution of Ar-38 sp/Ar-37 showed that 660 m.y. and 500 m.y. were the most reliable exposure ages for L24A and L24B, respectively. The Ti contents of less than or equal to 0.6 percent determined by gamma-counting prior to the Ar analysis indicate both fragments being associated with the group of low-Ti or even very low-Ti basalts.
Albarède Francis
Stettler Anton
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