Na-Al Chondrules: Analyses, Experiments, and Formation Constraints

Details Na-Al Chondrules: Analyses, Experiments, and Formation Constraints Na-Al Chondrules: Analyses, Experiments, and Formation Constraints

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..457g&link_type=abstract

Lunar and Planetary Science, volume 27, page 457

Physics

2

Chondrites, Chondrules, Electron Microprobe, Glass

Scientific paper

Na-Al rich glass from 14 chondrules in unequilibrated ordinary chondrites (UOC) have been analyzed using the Na-decay method of, which corrects for Na 'loss' during EPMA. Previous analyses of Na-Al rich chondrules probably suffered from Na 'loss', as these studies found the Na/Al ratio was between CI and albite. The Na/Al ratios of these chondrules are all very close to albite suggesting that a Na-Al phase was a major precursor mineral. Experiments have been conducted to determine their formation histories. It is suggested that these chondrules formed by the flash heating of precursor dustballs rich in moderately volatile elements admixed with various proportions of forsteritic olivine. Constraints on the heating event are presented.

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