Mathematics – Logic
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..40...71d&link_type=abstract
Earth and Planetary Science Letters, vol. 40, no. 1, June 1978, p. 71-82.
Mathematics
Logic
13
Chondrites, Chondrule, Meteoritic Composition, Meteoritic Microstructures, Chemical Analysis, Condensation, Evolution (Development), Fractionation, Glass, Hypervelocity Impact, Igneous Rocks, Melting, Olivine, Tables (Data), Volatilization, Silicates, Sulfur, Iron, Chondrules, Formation Of, Fractionation, Manych, Chondrite, Chondrites, Chemical Composition, Microprobe Analysis, Petrography, Nickel
Scientific paper
Twenty-three objects in a thin section of the Manych chondrite, including 18 drop-formed chondrules, four devitrified glasses, and a glassy selvage on an olivine-rich microporphyritic chondrule, have been analyzed using an automated microprobe and an expanded electron beam. The resulting chemical and normative compositions of the drop-formed chondrules are summarized, and a compositional gap between silica-rich and silica-poor chondrules is found which indicates that most droplet chondrules in Manych are substantially more or less siliceous than the large microporphyritic chondrules in this meteorite. The compositions of the chondrules are employed to identify the processes responsible for their chemical variation, and the data for both microporphyritic and droplet chondrules in Manych are integrated in a model for the origin of chondrules in ordinary chondrites. It is suggested that the drop-formed chondrules were produced by nonrepresentative sampling of microporphyritic precursor rocks mineralogically and texturally similar to the microporphyritic chondrules which predominate in Manych and other type 3 ordinary chondrites, that vapor-liquid condensation affected many of the droplet chondrules, and that fusion of dust by hypervelocity impact is the most plausible formation mechanism for droplet chondrules.
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