Mathematics – Logic
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1763r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Oct. 1982, p. 1763-1776.
Mathematics
Logic
17
Chondrule, Meteoritic Composition, Micrometeorites, Mineralogy, Petrography, Carbonaceous Chondrites, Interplanetary Dust, Mass Distribution, Size Distribution
Scientific paper
Electron microprobe, scanning electron microscope, and petrographic analyses of the microchondritic clast of the Piancaldoli LL3 chondrite are reported and compared with other type three chondrites. The clast, like other type three chondrites, has a fine-grained Fe-rich opaque silicate matrix, sharply defined chondrules, abundant low-Ca clinopyroxene and minor troilite and Si and Cr-bearing metallic Fe, Ni. However, the very high model matrix abundance, unique characteristics of the chondrules, and absence of microscopically observable olivine indicate that the clast is a new type of type three chondrite. It is concluded that the microchondrules were formed by the same process that formed normal-sized chondrules in type three chondrites: melting of preexisting dustballs. It is suggested that dust grains were mineralogically sorted in the nebula before aggregating into dustballs.
Keil Klaus
Rubin Alan E.
Scott Edward R. D.
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