Computer Science
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...243..925m&link_type=abstract
Science (ISSN 0036-8075), vol. 243, Feb. 17, 1989, p. 925-928.
Computer Science
9
Moon, Highlands, Troctolite, Magnesium, Lithology, Samples, Lunar, Spinel, Cordierite, Breccias, Apollo 15, 15295, Mineralogy, Origin, Composition, Formation, Metamorphism, Clasts, Crust, Depth, Abundance, Photomicrographs, Laboratory Studies, Crystallization, Cumlates
Scientific paper
A clast of spineltroctolite containing 8 percent cordierite (Mg2,Al4Si5O18) has been identified among the constituents of Apollo 15 regolith breccia 15295. The cordierite and associated anorthite, forsteritic olivine, and pleonaste spinel represent a new, Mg-rich lunar highlands lithology that formed by metamorphism of an igneous spinel cumulate. The cordierite-forsterite pair in the assemblage is stable at a maximum pressure of 2.5 kilobars, equivalent to a depth of 50 kilometers, or 10 kilometers above the lunar crust-mantle boundary. The occurrence of the clast indicates that spinel cumulates are a more important constituent of the lower lunar crust than has been recognized. The rarity of cordierite-spinel troctolite among lunar rock samples suggests that it is excavated only by large impact events, such as the one that formed the adjacent Imbrium Basin.
Carey William J.
Lindström Markus
Marvin Ursula B.
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