Distribution of Li-Be-B in meteoritic chondrules

Details Distribution of Li-Be-B in meteoritic chondrules Distribution of Li-Be-B in meteoritic chondrules

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..247h&link_type=abstract

Meteoritics & Planetary Science, vol. 34, no. 2, pp. 247-258 (1999).

Physics

7

Scientific paper

The distribution of Li, Be and B was studied by ion microprobe mass spectrometry in 36 chondrules from the Semarkona, Bishunpur, Allende, Clovis #1 and Hedjaz meteorites. Within a single chondrule, Li-Be-B concentrations can vary up to one order of magnitude. For example, in a chondrule from Hedjaz, concentrations range from 0.3 to 2.4 ppm for Li, from <0.001 to 0.17 ppm for Be and from 0.4 to 5.5 ppm for B. Among chondrules from Semarkona and Bishunpur, clear crystal-mesostasis partitioning was observed in 9 chondrules for Li, in 9 for Be and in 3 for B. The heterogeneities in the distribution of Li-Be-B in chondrules from Semarkona and Bishunpur appear to be primary features inherited from chondrule precursors and not totally obscured during chondrule formation. A redistribution of B was nevertheless observed at the whole-rock scale for Allende (B-Al2O3 correlation) and Hedjaz (B-SiO2 correlation). At the scale of bulk chondrules a robust correlation is observed for all studied meteorites between the B/Be and the B/Li ratios, indicating that Li and Be are much less heterogeneously distributed in chondrites than B. Mean Li, Be and B concentrations of chondrules ([Li] ~ppm; [Be] ~ppm; [B] ~ppm), are consistent with those of Orgueil ([Li] ~1.49ppm; [Be] ~ 0.0249ppm; [B] ~0.87ppm), but the mean Li/Be ratio of chondrules () is a factor of ~4 depleted relative to Orgueil (Li/Be ratio of ~78). Such a depletion is puzzling since no correlation between Li and Na or B has been found as expected to result from volatilization processes during chondrule melting and cooling. As a consequence the exact abundance of solar system Li remains an open question.

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