Petrologic History of Moon Suggested by Petrography, Mineralogy, and Crystallography

Details Petrologic History of Moon Suggested by Petrography, Mineralogy, and Crystallography Petrologic History of Moon Suggested by Petrography, Mineralogy, and Crystallography

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..587a&link_type=abstract

Science, Volume 167, Issue 3918, pp. 587-590

Computer Science

13

Scientific paper

Opaque mineral compositions indicate that the fugacity of oxygen is approximately 10-13 (earth basalts, 10-10). Experiments under reducing conditions suggest that the crystallization range is approximately 1140 degrees to 1070 degrees C. Iron-rich pyroxmangite, fayalite, and hedenbergite occur in microgabbro. Ferropseudobrookite rimmed by ilmenite containing rutile and Cr-spinel lamellae occurs in ferrobasalt. Plagioclase vitrophyres in breccia can explain highland Surveyor VII analysis. We suggest crystal-liquid differentiation of out-gassed convecting moon with growing Fe-rich core, olivine-pyroxene mantle, plagioclase-rich dynamic crust underlain by nonspherical, inversely stratified ferrobasalt. Impact-breaking or convenctionthrusting of crust releases fraction rich in Fe and Ti. Scanning electron microscopy of glass balls reveals minute depressions consistent with micrometeorite impact.

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