Argon-argon ages of consortium breccia 73215

Details Argon-argon ages of consortium breccia 73215 Argon-argon ages of consortium breccia 73215

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7.2201j&link_type=abstract

In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 2. (A77-34651 15-91) New York, Pergamon

Computer Science

8

Argon Isotopes, Breccia, Lunar Rocks, Radioactive Age Determination, Chronology, Lithology, Lunar Crust, Lunar Evolution, Meteoritic Composition, Tables (Data)

Scientific paper

Light-gray consortium breccia 73215 is exceptional in that it was formed in a one stage event (presumably the excavation of Serenitatis Basin), cooled rapidly after it formed, and was not subsequently reheated. Ar-Ar ages of eleven clast and matrix samples yield plateau ages between 4.04 and 4.28 b.y. This is direct evidence against purely 'basin-dominated' chronologies. Matrix dominated by melts produced in the excavation event yields a basin age of about 4.05 b.y. The clasts were not completely reset upon excavation. Their ages probably reflect the age diversity of the impacted source regions in which the oldest clasts consolidated at or before about 4.25 b.y. ago.

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