North Massif lithologies and chemical compositions viewed from 2-4 MM particles of soil sample 76503

Details North Massif lithologies and chemical compositions viewed from 2-4 MM particles of soil sample 76503 North Massif lithologies and chemical compositions viewed from 2-4 MM particles of soil sample 76503

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ga17.conf....2b&link_type=abstract

In Lunar Science Inst., Workshop on Geology of the Apollo 17 Landing Site p 2-4 (SEE N93-18786 06-91)

Mathematics

Logic

1

Chemical Composition, Highlands, Kreep, Lithology, Lunar Geology, Lunar Soil, Massifs, Statistical Distributions, Lunar Rocks, Regolith

Scientific paper

We identify the lithologic and compositional components of soil 76503 based on INAA of 243 2-4-mm particles and 72 thin sections from these and associated 1-2-mm particles (76502). We present a statistical distribution of the major compositional types as the first step of a detailed comparative study of the North and South Massifs. The soil sample was collected well away from any boulder and is more representative of typical North Massif material than any single large rock or boulder sample. So far, our examination of the 76503 particles has provided a better definition of precursor igneous lithologies and their petrogenetic relationships. It has enabled us to refine the nature of mixing components for the North Massif less than 1-mm fines. It has confirmed the differences in lithologies and their proportions between materials of the North and South Massifs; e.g., the North Massif is distinguished by the absence of a 72275-type KREEP component, the abundance of a highly magnesian igneous component, and the absence of certain types of melt compositions found in the South Massif samples.

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