Cosmic ray exposure histories and U-235-Xe-136 dating of Apollo 11, Apollo 12, and Apollo 17 mare basalts

Details Cosmic ray exposure histories and U-235-Xe-136 dating of Apollo 11, Apollo 12, and Apollo 17 mare basalts Cosmic ray exposure histories and U-235-Xe-136 dating of Apollo 11, Apollo 12, and Apollo 17 mare basalts

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15..171e&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,

Physics

4

Basalt, Cosmic Rays, Lava, Lunar Rocks, Rare Gases, Regolith, Apollo 11 Flight, Apollo 12 Flight, Apollo 17 Flight, Moon, Apollo Missions, Apollo 11, Apollo 12, Apollo 17, Mare Basalts, Cosmic Rays, Exposure, History, Dating Methods, Uranium 235, Xenon 136, Ages, Samples, Lunar, Rare Gases, Isotopes, 10003, 10047, 12004, 12051, 77135, 10057, 10069, 12040, 12053, Isotopic Ratios, Lava, Flows, Source, Parent Material, Crystallization, Thickness, Origin

Scientific paper

The history of exposure to cosmic rays was studied for nine basaltic rocks based on the cosmic-ray-produced noble gas isotopes. The results for the five basalts 10003, 10047, 12004, 12051, and 77135 are consistent with a single-stage exposure. Four basalts, 10057, 10069, 12040, and 12053, experienced a multistage exposure. Using the U-235-Xe-136 dating method, the time of their early exposure to cosmic rays on the lunar surface was dated to have begun three to four aeons ago, immediately after rock formation as defined by their crystallization ages. The durations and shielding depths for the proposed two-stage exposure models of the four basalts were calculated. From the shielding at the early stage, a lower limit of 50 cm is estimated for the thickness of the lava flows from which the investigated basalts originate.

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