Boron isotope ratios in meteorites and lunar rocks

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Scientific paper

The 11 B/ 10 B ratios of thirty-two meteorite falls and nine lunar rocks were measured as Cs 2 BO 2 + using thermal ionization mass-spectrometry. The 11 B/ 10 B ratios of meteorites vary from 4.011 to 4.098, i.e., their 11 B values (relative to NIST SRM 951) range from -10.5 to +19.2%; however, excluding two outliers, Mokoia and Norton County, the range of most meteorites is smaller ( -10.5 to +7.5). The average of two C11 meteorites, Ivuna and Orgueil, is -3.3, in the middle of the range. The 11 B values of the lunar rocks vary less than those of meteorites, from -6.0 to -3.9. The average 11 B of CI1 chondrites is -3.3, similar to that of terrestrial fresh mid-ocean ridge basalts (-6.5 to -1.2) and to the estimated mantle value of +0.2 (Ishikawa and Nakamura, 1992), which is the best representative of the whole Earth. The similarity of 11 B values in meteorites, lunar rocks, and those parts of the Earth unaffected by water implies that the boron isotopic composition of the Solar System is rather homogeneous. Recently, Chaussidon and Robert (1995) reported larger variation of 11 B values in chondrules of three chondrites, from -50 to +40. This degree of heterogeneity is absent from bulk meteorites.

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