Rb-Sr-analyses of Apollo 16 melt rocks and a new age estimate for the Imbrium basin - Lunar basin chronology and the early heavy bombardment of the moon

Details Rb-Sr-analyses of Apollo 16 melt rocks and a new age estimate for the Imbrium basin - Lunar basin chronology and the early heavy bombardment of the moon Rb-Sr-analyses of Apollo 16 melt rocks and a new age estimate for the Imbrium basin - Lunar basin chronology and the early heavy bombardment of the moon

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1951d&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, July 1987, p. 1951-1964.

Computer Science

21

Geochronology, Lunar Evolution, Lunar Rocks, Petrology, Selenology, Apollo 16 Flight, Crystallization, Impact Melts, Rubidium Isotopes, Strontium Isotopes, Structural Basins, Moon, Apollo 16, Dating Methods, Rubidium, Strontium, Samples, Lunar, Age, Basins, Imbrium, Mare, Chronology, Bombardment, History, Source, Isotopic Ratios, Crystallization Age, Parent Material, Descartes, Cayley, 67728, 67946, 67672, 63566, 67567, 67627, 67629, 65795, 60635, Melts, Comparisons, Origin, Fra Mauro, Procedure, Isochrons,

Scientific paper

The Rb and Sr content of seven impact glass bombs and two crystalline impact-melt rocks collected on the Apollo 16 mission is measured experimentally by chemical separation and mass spectrometry. The results are presented in extensive diagrams, graphs, and tables and characterized in detail. An age of 3.77 + or - 0.02 Gyr (or possibly as young as 3.75 Gyr) is determined for the Imbrium basin and the related Fra Mauro and Cayley formations, implying ages of 3.92 + or - 0.03 Gyr for the Nectaris basin, 3.87 + or - 0.03 Gyr for the Serenitaties basin, and 3.84 + or - 0.04 Gyr for the Crisium basin. Hence the present data do not support the hypothesis of a 'late terminal cataclysm' about 3.8 Gyr ago; instead, they are consistent with an early heavy bombardment (from the moon's accretion until about 3.75 Gyr ago) with a steep monotonic decrease in the impactor flux.

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