Computer Science
Scientific paper
Jan 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..33..389w&link_type=abstract
Earth and Planetary Science Letters, vol. 33, no. 3, Jan. 1977, p. 389-400.
Computer Science
6
Apollo 17 Flight, Chemical Properties, Impact Damage, Lunar Rocks, Radioactive Age Determination, Abundance, Gabbro, Lunar Evolution, Lunar Landing Sites, Rubidium Isotopes, Strontium Isotopes, Trace Elements
Scientific paper
Major, minor, and trace-element compositions, age data, and Rb/Sr systematics of Apollo 17 boulders have been compiled, and additional analyses performed on a norite breccia clast (77215) included in the Apollo 17, Station 7 boulder. The Apollo 17 boulders are found to be identical or nearly so in major, minor, and trace-element composition, suggesting that they all originated as an impact melt analogous to melt sheets found in larger terrestrial craters. The matrix dates (Ar-40/Ar-39) and Rb/Sr systematics available suggest that this impact melt formed by a single impact about 4 billion years ago. This impact excavated, shocked, brecciated, and melted norites, norite cumulates, and possibly anorthositic gabbros and dunites about 4.4 billion years old. The impact was likely a major one, possibly the Serenitatis basin-forming event.
Lindstrom David J.
Lindström Markus
Lum K. L. R.
Nava David F.
Philpotts John A.
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