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• W2057831497 endingPage "1009" @default.
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• W2057831497 abstract "We have analyzed B in carbonaceous chondrites in order to clarify a factor of 100 difference between the solar system B abundance derived from the solar photosphere and that inferred from previous meteorite data. Consistent results were obtained from two instrumental methods for B analysis: (a) counting of the high energy betas from 12B produced by the 11B(d,p) reaction, and (b) measurement of particle track densities from 10B(n,α)7Li in a plastic track detector affixed to a homogenized meteorite sample. Contamination is a major problem in B analyses, but extensive testing showed that our results were not seriously affected. Our B concentrations are typically 1–2 ppm and are a factor of 2–6 lower than previous carbonaceous chondrite measurements. Our data for the Cl chondrites Ivuna and Orgueil would indicate a solar system B/Si atomic abundance ratio of 58 × 10−6, but this is still a factor of 2–10 higher than the photospheric estimates. It may be that B is depleted in the sun by thermonuclear processes; however, the similarity of photospheric and meteoritic Be abundances is a problem for this point of view. Alternatively, B may be enhanced in carbonaceous chondrites, but this would make B a cosmochemically unique element. A mm-sized (Fe,Mn,Mg)CO3 crystal from Orgueil shows no B enrichment. We find 10B ≤ 1016 atoms/g in two Allende fine-grained inclusions suggesting that B is not a refractory element under solar nebula conditions. This 10B limit, when taken as a limit on 10Be when the inclusion formed, puts constraints on the possibility of a solar system synthesis of 26Al. For a proton spectrum of E−a, a must be ≥ 3 if a solar gas is irradiated or a ≥1.5 if dust of solar composition is irradiated." @default.
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• W2057831497 date "1978-07-01" @default.
• W2057831497 modified "2023-10-14" @default.
• W2057831497 title "Boron concentrations in carbonaceous chondrites" @default.
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• W2057831497 doi "https://doi.org/10.1016/0016-7037(78)90289-2" @default.
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