Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..207c&link_type=abstract
Lunar and Planetary Science, volume 27, page 207
Other
3
Boron, Chondrules, Isotopes, Lithium, Presolar Nebula
Scientific paper
We report here the preliminary results of tests concerning two major implications of the boron isotope variations that were recently found in meteoritic chondrules (Chaussidon and Robert 1995, Nature 374, 337-339). (1) Freshly nucleosynthetized boron with variable 11B/10B ratios must have been preserved as solid grains in the solar nebula and implanted or embedded in the newly formed chondrules. Therefore, chondrules cooling rates do not allow a complete isotopic homogenisation which can be tested experimentally. (2) Another element, lithium, is also formed by the spallogenic reactions occurring in the presolar cloud with a spallogenic isotopic ratio (7Li/6Li) between 2 and 5 according to different models, which is lower than the bulk solar system ratio of ~12.5. Therefore, a negative correlation between the isotopic compositions of Li and B should be present in chondrules.
Chaussidon Marc
Robert Frédéric
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