Normative composition and classification of lunar igneous rock and glasses. I - Lunar igneous rocks

Details Normative composition and classification of lunar igneous rock and glasses. I - Lunar igneous rocks Normative composition and classification of lunar igneous rock and glasses. I - Lunar igneous rocks

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..42..213e&link_type=abstract

Earth and Planetary Science Letters, vol. 42, no. 2, Feb. 1979, p. 213-222. Research supported by the Deutsche Forschungsgemein

Computer Science

1

Chemical Composition, Glass, Igneous Rocks, Lunar Rocks, Petrography, Algol, Feldspars, Ilmenite, Lunar Geology, Nomenclatures, Olivine, Pyroxenes, Quartz, Tables (Data), Textures

Scientific paper

The normative mineral compositions of lunar rocks with igneous textures are determined and a classification system based on these compositions is proposed. The results of 678 major element analyses and all available trace element determinations were compiled and Rittmann norms were calculated. The norm values were plotted into quartz-plagioclase-orthopyroxene and olivine-plagioclase-orthopyroxene triangles for four ranges of clinopyroxene content. The plots indicate that lunar rocks form a compositional continuum from rocks very high in plagioclase to plagioclase-poorer and clinopyroxene- and orthopyroxene-richer rocks containing partly quartz and partly olivine. The continuum is divided into five groups based on clinopyroxene content and plagioclase/orthopyroxene ratios and average trace element compositions for these groups are presented. Analyzed rocks and fragments are classified by this scheme and it is compared to existing classification systems. A systematic nomenclature for lunar rocks which conforms to the nomenclature of terrestrial rocks is proposed.

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