Ar-40/Ar-39 age spectra of Apollo 15 impact melt rocks by laser step-heating and their bearing on the history of lunar basin formation

Details Ar-40/Ar-39 age spectra of Apollo 15 impact melt rocks by laser step-heating and their bearing on the history of lunar basin formation Ar-40/Ar-39 age spectra of Apollo 15 impact melt rocks by laser step-heating and their bearing on the history of lunar basin formation

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813085d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E7, p. 13,085-13,095.

Physics

33

Argon Isotopes, Impact Melts, Laser Heating, Lunar Rocks, Radioactive Age Determination, Apollo 15 Flight, Chronology, Planetary Evolution, Single Crystals, Moon, Samples, Lunar, Apollo 15 Mission, Age, Spectra, Age Dating, Isotopic Ratios, Laboratory Studies, Melts, Laser Methods, Basins, Origin, Formation, Argon, Apennine Front, Analysis, Impact Effects, Procedure, Chronology, Maria, Bombardment, Timescale, 15294, 15304, 15357, 15359, 15356, 15314, 15308, 15414, 15436, 15445

Scientific paper

Results are reported on 26 high-resolution (16-51 steps) Ar-40/Ar-39 age spectra obtained on 12 Apollo-15 melt rocks of different composition using a continuous laser system on submg fragments of recrystallized melt and single-crystal plagioclase clasts from impact melt rocks collected at the Apennine Front where the Imbrium and Serenitatis basins intersect. A table is presented with the summary of the Ar-40/Ar-39 spectrum data, which represent 891 individual temperature step analyses. Also presented are 20 of the 26 age spectra along with their respective K/Ca plots. Melt rock fragments and plagioclase clasts from seven of the 12 samples analyzed yielded reproducible, intermediate-T Ar-40/Ar-39 age spectrum plateaus, which were interpreted as crystallization ages that represent the times of impact of bolides onto the lunar surface.

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