title: Petrologic history of moon suggested by petrography, mineralogy, and crystallography.
abstract: 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 convection-thrusting of crust releases fraction rich in Fe and Ti. Scanning electron microscopy of glass balls reveals minute depressions consistent with micrometeorite impact.
authors.forename: A T
authors.initials: AT
authors.lastname: Anderson
authors.forename: A V
authors.initials: AV
authors.lastname: Crewe
authors.forename: J R
authors.initials: JR
authors.lastname: Goldsmith
authors.forename: P B
authors.initials: PB
authors.lastname: Moore
authors.forename: J C
authors.initials: JC
authors.lastname: Newton
authors.forename: E J
authors.initials: EJ
authors.lastname: Olsen
authors.forename: J V
authors.initials: JV
authors.lastname: Smith
authors.forename: P J
authors.initials: PJ
authors.lastname: Wyllie