Physics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91...55e&link_type=abstract
(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)
Physics
3
Breccia, Cosmic Rays, Highlands, Lunar Composition, Lunar Evolution, Lunar Rocks, Apollo 16 Flight, Lunar Craters, Radiation Dosage, Rare Gases, Selenology
Scientific paper
Lunar breccias 60018, 67435, and 67455 experienced a single-stage exposure to cosmic rays. These materials had been shielded from cosmic rays when 60018 was excavated by the South Ray cratering event about 2 My ago and rocks 67435 and 67455 by the North Ray impact about 50 My ago. After excavation, the shielding depth of the investigated samples was less than 40 g/sq cm, in accord with the location at the time of collection. The gas retention ages, as calculated from Xe-136 produced by the spontaneous fission of U-238 and Pu-244, show that the breccia minerals solidified and cooled 3.6-4.1 Gy ago. The breccias contain measurable amounts of trapped noble gases, which, are two to four orders of magnitude lower than in typical lunar soil.
Eugster Otto
Niedermann Samuel
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