Abstract
The isotopic composition and the distribution of lithium have been studied in the Holbrook meteorites, in granite and in hornblende, using a sputtering ion source mass spectrometer of our own design. In granite and hornblende, the isotopic ratios obtained for all the points of the surface which have been investigated remain 12.0 within a ±2% uncertainty (uncorrected for mass discrimination).With exactly the same technique, the ratios obtained in Holbrook show fluctuations of about ± 10% around an average of 12.0.
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