Light and dark soils at the Apollo 16 landing site

Details Light and dark soils at the Apollo 16 landing site Light and dark soils at the Apollo 16 landing site

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975moon...13...81h&link_type=abstract

(Lunar Science Institute, Symposium on Origin and Evolution of the Lunar Regolith, Houston, Tex., Nov. 13-15, 1974.) The Moon, v

Computer Science

9

Apollo 16 Flight, Lunar Landing Sites, Lunar Soil, Breccia, Lunar Composition, Lunar Surface, Soil Science, Tables (Data)

Scientific paper

Lunar soils are discussed within the framework of a three-group classification scheme. Group I comprises North Ray Crater soils, group II contains light soils, and group III is made up of dark soils. It is suggested that group I soils originated from the light friable unit, one of the three units inside North Ray Crater. Group II soils were probably derived from the light matrix breccia unit; group II soils are mixtures of materials from all three units. It is concluded that soils with group III properties have been at the surface continuously for long periods. Group II soils show a record of solar wind exposure in the distant past (i.e., they have large (Ar-40/Ar-36)T ratios). Thus the regolith at the Apollo 16 site, which was observed to have marked layers of dark against light soils, contains sizeable 'pockets' or horizons at depth which are the sources of the group II soils.

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