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- W2139862178 abstract "K, Rb, and Sr concentrations and Sr isotopic composition are reported for hand-picked fractions from the 175- to 1000-μm Apollo 12 fines samples 12032 and 12070. In addition, two <1-mm bulk fines samples, 14163,160 and 14259,21, from Apollo 14 were analyzed; these have model Rb-Sr ages close to 4.6 b.y. The Apollo 14 data indicate the presence of a radiogenic component of 4.6-b.y. model age like the Apollo 12 fines, confirming a very early geochemical differentiation of the moon. Progressively greater enrichment in K and Rb relative to the bulk fines is shown by microbreccia from both samples, ropy brown glass from 12032, and light-grey lithic fragments from 12032. Model Rb-Sr ages, based on a basaltic achondrite initial ratio, are generally close to 4.6 b.y. The microbreccias and ropy brown glass have model ages that are younger but indistinguishable from 4.6 b.y. within analytical error. Light grey lithic fragments from 12032 have a model age of 5.1 b.y. and must have had a multistage Rb/Sr evolution. The data are broadly compatible with two-component mixing models of the Apollo 12 fines. On the basis of modal composition, the microbreccia is considered the major nonbasaltic constituent. A more complex model is necessary, since the light-grey lithic fragments, at least, have a distinct Rb/Sr isotopic history. There is no compelling evidence that all the exotic material was introduced in a single event." @default.
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- W2139862178 date "1972-04-10" @default.
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- W2139862178 title "Rubidium-strontium isotope characteristics of lunar soils" @default.
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- W2139862178 doi "https://doi.org/10.1029/jb077i011p02007" @default.
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