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

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

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..171e&link_type=abstract

Journal of Geophysical Research, Vol. 89, Suppl., p. C171 - C181

Physics

4

Cosmic Rays:Moon, Moon:Basalts, Moon:Cosmic Rays

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 235U-136Xe dating method, the time of their early exposure to cosmic rays on the lunar surface was dated to have begun 3 - 4 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 the authors estimate a lower limit of 50 cm for the thickness of the lava flows from which the investigated basalts originate.

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