The chronology of the Apollo 17 Station 6 boulder

Details The chronology of the Apollo 17 Station 6 boulder The chronology of the Apollo 17 Station 6 boulder

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7.2267c&link_type=abstract

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

Mathematics

Logic

2

Argon Isotopes, Chronology, Lunar Rocks, Radioactive Age Determination, Apollo 17 Flight, Chemical Composition, Iron, Magnesium, Potassium, Recrystallization, Silicates, Temperature Effects

Scientific paper

Six matrix samples and four clasts from the Apollo 17 Station 6 boulder have been analyzed by the Ar-40-Ar-39 method. All samples yielded well defined and essentially identical ages, indicating that the impact event which produced this well-recrystallized boulder occurred 3.96 plus or minus 0.04 G.y. ago. The matrix samples are chemically similar but provide a regular gradation of petrological characteristics which correlate with a regular variation in argon systematics. The high-temperature decrease in apparent age which is a common feature of lunar samples is greatest for the finest grained samples, an observation which can be understood in terms of Ar-39 recoil from K-rich phases into the more retentive K-poor iron magnesium silicates.

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