Ar-40/Ar-39 ages of six Apollo 15 impact melt rocks by laser step heating

Details Ar-40/Ar-39 ages of six Apollo 15 impact melt rocks by laser step heating Ar-40/Ar-39 ages of six Apollo 15 impact melt rocks by laser step heating

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1163d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, June 1991, p. 1163-1166.

Physics

6

Apollo 15 Flight, Argon Isotopes, Laser Heating, Lunar Rocks, Lunar Surface, Argon Lasers, High Resolution, Mass Spectroscopy

Scientific paper

Fifteen high resolution (21-51 step) Ar-40/Ar-39 age spectra are obtained for six Apollo 15 impact melt rocks of different compositions, using a continuous laser system on submilligram subsamples and on single crystal plagioclase clasts. Four of the six samples gave reproducible age spectra with well-defined intermediate temperature plateaus over 48 percent or more of the Ar-39 released; the plateaus are interpreted as crystallization ages. Samples 15304,7,69, 15294,6,21 and 15314,26,156 gave virtually identical plateau ages whose weighted mean is 3870 + or - 6 Ma. These three melt rocks differ in composition and likely formed in three separate impact events.

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