Other
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983polre..30...45k&link_type=abstract
(National Institute of Polar Research, Symposium on Antarctic Mateorites, 8th, Tokyo, Japan, Feb. 17-19, 1983) National Institut
Other
2
Allende Meteorite, Chondrites, Inclusions, Meteoritic Composition, Petrography, Refractory Materials, Aluminum Compounds, Calcium Compounds, Classifications, Electron Microscopy, Grain Size
Scientific paper
Results are reported for a comprehensive petrographic survey of the refractory inclusions in the Allende and Mokoia CV3 chondrites. More than 600 refractory inclusions in 22 thin sections of the meteorites were studied by optical and scanning-electron microscopy. Olivine-rich inclusions and Ca, Al-rich inclusions (CAIs) are aggregates of various combinations of three fundamental petrographic constituents: rimmed concentric objects, Ca, Si-rich chaotic material, and mafic inclusion matrix. A new classification system for refractory inclusions is developed that is based on the size and abundance of these three fundamental constituents. The new classification system avoids several problems that are inherent in other classification systems, which use the term 'coarse-grained' too restrictively for many simple CAIs and inaccurately for most mililite-rich complex CAIs.
Cohen Richard E.
Kornacki Alan S.
Wood John A.
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