Abstract
Several investigators have attempted, from studies of lithic fragments and/or glasses, to determine the types of rocks that constitute the parent materials of lunar highland soils. Comparing only major element data, and thus avoiding the problems induced by individual classifications, these data appear to converge on a relatively limited number of rock types. The highland soils are derived from a suite of highly feldspathic rocks comprising anorthositic gabbros (or norites), high alumina basalts, troctolites, and less abundant gabbroic (or noritic) anorthosites, anorthosites and KREEP basalts.
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