Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35.1183g&link_type=abstract
Meteoritics & Planetary Science, vol. 35, no. 6, pp. 1183-1188 (2000).
Physics
7
Scientific paper
To assess whether the alkali behavior observed in chondrules of primitive meteorites is due to volatilization from the raw materials of chondrules during chondrule formation events or due to condensation processes from the nebular gas, we set up a new experimental device able to expose silicate melt samples to a controlled alkali partial pressure at high temperature under fixed oxygen fugacity. Using a mixture of potassium carbonate (K2CO3) and graphite (C) as the source of the potassium gas (Kg), we studied the condensation kinetics of potassium and its solubility in CaO-MgO-Al2O3-SiO2 silicate melts, according to the reaction 2 K (g) + 1/2 O2 (g) = K2O (melt). From these results, we show that alkali entering in chondrules from the nebular gas is a viable mechanism to explain the chondrules alkali contents and their ?41K isotopic signatures, at time scales relevant to chondrule formation. Finally, we also suggest that chondrules may have formed in non-canonical nebular environments and that the flash heating scenario is not a prerequisite to chondrule formation.
Deloule Etienne
Georges Patrick
Libourel Guy
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