A unified approach to a fragmental problem: Petrological and geochemical studies of lithic fragments from Apollo 15 soils

Details A unified approach to a fragmental problem: Petrological and geochemical studies of lithic fragments from Apollo 15 soils A unified approach to a fragmental problem: Petrological and geochemical studies of lithic fragments from Apollo 15 soils

Nov 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20..425d&link_type=abstract

Earth and Planetary Science Letters, Volume 20, Issue 3, p. 425-439.

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We report the results of a petrological-(nondestructive) geochemical investigation of some lithic fragments separated from Apollo 15 soil samples. Three groups of non-mare materials are recognized on the basis of REE concentrations, viz. KREEP-rich, KREEP-intermediate, and KREEP-poor rocks. These groups may be discrete rather than gradational. Within the group of KREEP-rich rocks three subtypes are recognized. These subtypes do not appear to be simply related to one another. Apollo 15 mare basalts have the lowest REE concentrations observed thus far. All mare basalts analyzed in this study display small negative Eu anomalies.

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