Multistage exposure history of the 72461 soil constituents

Details Multistage exposure history of the 72461 soil constituents Multistage exposure history of the 72461 soil constituents

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...16...95e&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

Physics

2

Lunar Composition, Lunar Evolution, Lunar Soil, Basalt, Glass, Grain Size, Lunar Craters, Rare Gases, Regolith, Moon, Samples, Lunar, Apollo 17, 74261, Soil, Composition, Shorty, Age, Regolith, Cosmic Rays, Exposure, History, Isotopes, Rare Gases, Basalt, Depth, Clinopyroxene, Plagioclase, Grains, Orange Glass, Dating Methods, Glass, Argon, Isotopic Ratios, Volatiles, Hypotheses, Tarus-Littrow Valley

Scientific paper

Gray soil 74261 collected on the rim of the Shorty crater in the Taurus Littrow valley, which may represent old lunar regolith material, was studied. The exposure history of different soil components was investigated by calculating the duration of the pre-Shorty stage from Kr-81-Kr dating and by deriving the shielding of this stage from the depth-sensitive cosmic ray-produced ratio Xe-131/Xe-126. An attempt is made to date the time when the exposure prior to the Shorty event occurred, using the U-235-Xe-136 dating method. The isotopic composition of the trapped noble gases, in particular the Ar-40/Ar-36 ratio, of the soil constituents is measured. The results indicate that preexposure to volatiles in the lunar atmosphere and to solar and cosmic radiations occurred early in the history of the moon, perhaps about three eons ago. In this scenario, the 74261 soil was buried after the preexposure period beneath some shielding material until it was reexcavated by the Shorty crater impact.

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