Ar40-Ar39 dating of Luna 16 and Luna 20 samples

Details Ar40-Ar39 dating of Luna 16 and Luna 20 samples Ar40-Ar39 dating of Luna 16 and Luna 20 samples

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rspta.284..167c&link_type=abstract

Royal Society (London), Philosophical Transactions, Series A, vol. 284, no. 1319, Jan. 4, 1977, p. 167-177. Natural Environment

Mathematics

Logic

6

Argon Isotopes, Basalt, Lunar Rocks, Petrology, Radioactive Age Determination, Selenology, Anorthosite, Lava, Lunik 16 Lunar Probe, Lunik 20 Lunar Probe, Tables (Data)

Scientific paper

The Ar40-Ar39 isotope technique is used to determine the age of two fragments of Luna 16 mare basalt and two Luna 20 samples (one metaclastic fragment and a group of five anorthositic particles). The derived Luna 16 ages confirm that mare lavas were extruded in Mare Fecunditatis 3.4-3.5 billion years ago, and the age of the Luna 20 metaclastic fragment indicate a 3.9 billion year age for the Crisium basin and a widespread cataclysmic bombardment of the moon between 4.05 and 3.85 billion years. Analysis of Luna 20 anorthositic sample reveals a plateau age of 4.40 + or - 0.10 billion years and a minimum age of 4.30 + or - 0.10 billion years. Geologically, preference is given to interpretation of ancient highland ages in terms of a relatively small number of events.

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