Apollo 17 materials viewed from 2 to 4 MM soil particles: Pre-serenitatis highlands components

Details Apollo 17 materials viewed from 2 to 4 MM soil particles: Pre-serenitatis highlands components Apollo 17 materials viewed from 2 to 4 MM soil particles: Pre-serenitatis highlands components

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..727j&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M p 727-728 (SEE N94-16173 03-91)

Other

Breccia, Highlands, Impact Melts, Lithology, Lunar Maria, Lunar Rocks, Lunar Soil, Fragments, Low Concentrations, Lunar Geology, Massifs, Surface Properties

Scientific paper

Among the highland lithologies of 2-4 mm rock fragments in North Massif soil 76503, we have found a compositional group, low in incompatible element concentrations, that we interpret as representing the pre-Serenitatis surface. A component of these materials is an igneous-textured lithology that we believe formed in large impact melts. These are compositionally similar to, and possibly precursors of, many of the granulitic breccias that appear to be mixtures of ferroan and magnesian-suite rocks. The polymict, or old, upper-crustal breccias, along with granulitic breccias and the endogenous igneous lithologies found particularly at the North Massif stations, constitute the poorly consolidated portions of North Massif. Highland samples from the South Massif, on the other hand, are enriched in materials of the competent, impact-melt breccias formed by the Serenitatis impact. The competent melt-breccias contain clasts of most of the pre-existing surface materials, but they also contain components not found in the rocks of the poorly consolidated massif materials.

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