Petrography and classification of Ca, Al-rich and olivine-rich inclusions in the Allende CV3 chondrite

Details Petrography and classification of Ca, Al-rich and olivine-rich inclusions in the Allende CV3 chondrite Petrography and classification of Ca, Al-rich and olivine-rich inclusions in the Allende CV3 chondrite

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...14..573k&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

1

Chondrites, Inclusions, Meteoritic Composition, Mineralogy, Petrology, Aluminum, Calcium, Classifications, Microstructure, Olivine, Meteorites, Chondrites, Petrography, Classification, Calcium, Aluminum, Inclusions, Cais, Olivine, Enrichment, Allende, Carbonaceous Chondrites, Cv3 Chonrites

Scientific paper

The results of a detailed, systematic petrographic survey of Ca, Al-rich and olivine-rich inclusions in the Allende CV3 chondrite are reported, and a new classification system based on clearly defined and readily applied petrographic criteria is presented. Most Allende inclusions are aggregates containing one or more of three distinct constituents: (1) rimmed concentric objects enriched in Al- and Ti-rich oxide minerals and various amounts of Ca-rich silicates; (2) porous, 'fine-grained' chaotic material enriched in Ca-rich silicates, especially clinopyroxenes and garnets; and (3) porous, 'fine-grained', mafic inclusion matrix, enriched in olivine, pyroxene, and feldspathoids. Two texturally distinct varieties of inclusions consist primarily of inclusion matrix: unrimmed olivine aggregates and rimmed olivine aggregates. Ca, Al-rich inclusions are classified on the basis of the size and abundance of their constituent concentric objects. Some fundamental relationships among Allende inclusions that previusly have not been emphasized are discussed.

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