Rare gas constraints on the history of Boulder 1, Station 2, Apollo 17

Details Rare gas constraints on the history of Boulder 1, Station 2, Apollo 17 Rare gas constraints on the history of Boulder 1, Station 2, Apollo 17

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975moon...14..407l&link_type=abstract

The Moon, vol. 14, Nov.-Dec. 1975, p. 407-444.

Computer Science

7

Cosmic Rays, Lunar Rocks, Radioactive Age Determination, Rare Gases, Abundance, Apollo 17 Flight, Breccia, Lunar Evolution, Lunar Landing Sites, Radioactive Isotopes, Solar Wind, Tables (Data), Thermal Stresses

Scientific paper

Results are reported for rare-gas isotopic analyses of pile-irradiated and unirradiated samples from Boulder 1, Station 2. The efforts are directed at three specific problems: Ar-40/Ar-39 dating of the samples, determination of the abundances and isotopic compositions of trapped rare gases and fission xenon, and detailed analysis of rare-gas isotopes produced by cosmic rays. The Ar dating results give an upper limit of 3.9 to 4 billion years for the age of the Serenitatis impact and show that the boulder experienced two thermal episodes. The trapped-gas determinations indicate that the components of the boulder were disaggregated and reconsolidated in a single event, while the Xe results show that this gas might be of lunar origin. The cosmic-ray exposure ages indicate that the boulder was buried in the South Massif prior to 55 million years ago, was uncovered at that time (probably as a result of excavation of the boulder source-crop), and has remained in its present configuration for the last 35 million years.

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