Physics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspta.297...27h&link_type=abstract
Royal Society (London), Philosophical Transactions, Series A, vol. 297, no. 1428, June 17, 1980, p. 27-39. Natural Environment
Physics
6
Argon Isotopes, Basalt, Cosmic Rays, Irradiation, Lunar Geology, Lunar Rocks, Abundance, Crystallization, Lunar Exploration, Lunar Maria, Lunik Lunar Probes, Pyroxenes, Regolith, Moon, Samples, Lunar, Luna 24, Basalts, Irradiation, History, Ages, Argon/Argon, Isotopic Ratios, Dating Techniques, Isotopes, Experiments, Procedure, Crystallization, Cooling, Exposure Ages, Deposition, Data, Regolith, Lithology, 24196, 24170, Analysis, Potassium, Abundance, Feldspars, Pyroxenes, Production Rates, Core-Tube Sample
Scientific paper
Results of an argon isotope analysis of the crystallization and cooling times and cosmic ray exposure of samples from two horizons of the Luna 24 core are presented. Ar-40/Ar-39 dating of the metabasalt 24196,1,9011 indicates ages of 3.36 + or - 0.11 billion years based on the high-temperature release fractions and 3.14 + or - 0.16 billion years based on the cumulate Ar-40/Ar-39 ratio; both ages are consistent with that of the layer 170 microgabbro and suggest that the Luna 24 metabasalts represent thermally metamorphosed flow margins. Ages of 3.37 + or - 0.20 billion years and 3.17 + or - 0.30 billion years are obtained for the feldspar and pyroxene of the layer 170 microgabbro, while ratios of cosmogenic Ar-38 to Ca in the two minerals are found to be identical, indicating little Ar-38 production from Fe in the pyroxene and implying that most cosmic ray irradiation was received at depth following deposition within the last 350-500 million years. Values of the cosmogenic Ar-38/Ca ratio for the metabasalt are interpreted to imply either deposition 50-100 million years before the microgabbro or a previous irradiation history. Data suggest that much of the core has remained indisturbed for the last 350-500 million years.
Hennessy J.
Turner Gary
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