Boron isotope ratios in meteorites and lunar rocks

Mingzhe Zhai, Eizou Nakamura, Denis M. Shaw, Toshio Nakano

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The 11B/10B ratios of thirty-two meteorite falls and nine lunar rocks were measured as Cs2BO+2 using thermal ionization mass-spectrometry. The 11B/10B ratios of meteorites vary from 4.011 to 4.098, i.e., their δ11B 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 CI1 meteorites, Ivuna and Orgueil, is -3.3, in the middle of the range. The δ11B values of the lunar rocks vary less than those of meteorites, from -6.0 to -3.9. The average δ11B 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 δ11B 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 δ11B values in chondrules of three chondrites, from -50 to +40. This degree of heterogeneity is absent from bulk meteorites.

Original languageEnglish
Pages (from-to)4877-4881
Number of pages5
JournalGeochimica et Cosmochimica Acta
Volume60
Issue number23
DOIs
Publication statusPublished - Dec 1996

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boron isotope
Meteorites
Boron
Isotopes
meteorite
Rocks
rock
chondrite
lunar meteorite
Earth (planet)
chondrule
outlier
mid-ocean ridge basalt
boron
Solar system
solar system
ionization
isotopic composition
Ionization
mass spectrometry

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Boron isotope ratios in meteorites and lunar rocks. / Zhai, Mingzhe; Nakamura, Eizou; Shaw, Denis M.; Nakano, Toshio.

In: Geochimica et Cosmochimica Acta, Vol. 60, No. 23, 12.1996, p. 4877-4881.

Research output: Contribution to journalArticle

Zhai, Mingzhe ; Nakamura, Eizou ; Shaw, Denis M. ; Nakano, Toshio. / Boron isotope ratios in meteorites and lunar rocks. In: Geochimica et Cosmochimica Acta. 1996 ; Vol. 60, No. 23. pp. 4877-4881.
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