Absolute time scale of lunar mare formation and filling

Details Absolute time scale of lunar mare formation and filling Absolute time scale of lunar mare formation and filling

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rspta.285..151g&link_type=abstract

(Royal Society, Discussion on the Moon - A New Appraisal from Space Missions and Laboratory Analyses, London, England, June 9-12

Physics

7

Argon Isotopes, Lunar Evolution, Lunar Maria, Lunar Rocks, Radioactive Age Determination, Structural Basins, Basalt, Calcium, Potassium, Selenology

Scientific paper

Ar-39-Ar-40 ages and Ca and K concentrations are inferred from neutron activated Apollo 11 rocks and plagioclase concentrates. It is found that there are at least three different times of rock formation, two for the low-K and one for the high-K rocks. The ages of the oldest mare basalts 10003 and 14053 of 3.91 plus or minus 0.03 and 3.95 plus or minus 0.03 Ga respectively, suggest that mafic basalt flows had already begun to invade the older basins when the last basin-forming impacts occurred.

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