Plagioclase-rich inclusions in carbonaceous chondrite meteorites - Liquid condensates?

Details Plagioclase-rich inclusions in carbonaceous chondrite meteorites - Liquid condensates? Plagioclase-rich inclusions in carbonaceous chondrite meteorites - Liquid condensates?

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..221w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, Feb. 1987, p. 221-242. Research supported by the Australian Research

Mathematics

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Aluminum, Calcium, Carbonaceous Chondrites, Inclusions, Meteoritic Composition, Mineralogy, Aluminum Isotopes, Meteoritic Microstructures, Pyroxenes, Spinel, Meteorites, Cabonaceous Chondrites, Plagioclase, Enrichment, Inclusions, Liquid, Condensates, C Chondrites, Stony Meteorites, Cais, Chondrules, Chemistry, Mineralogy, Composition, Comparisons, Classification, Ornans, Samples, Meteorite, Cv3 Chondrites, Allende, Leoville, Lance, Texture, Co3 Chondrites, Description, Experiments, Laboratory Studies, Proc

Scientific paper

The characteristics and formation of coarse-grained, plagioclase-rich inclusions are investigated. The textures, mineralogical compositions, and initial Al-26/Al-27 ratios for the plagioclase-rich inclusions are described. It is observed that plagioclase-rich inclusions in carbonaceous chondrites are either Ca-Al-rich inclusions (CAIs) composed of 30-60 vol pct anorthite, and less than 35 vol pct Ti-Al-pyroxene and melilite, or CA chondrites composed of plagioclase, pyroxene, olivine, spinel, and melilite. It is observed that CA chondrules are chemically and mineralogically the most similar components shared by carbonaceous and ordinary chondrites. The textural changes observed in the inclusions are examined. The data reveal that the CAIs have three textural groups: coarse anorthite laths, equigranular anorthite and Ti-Al-pyroxene, and lacy Ti-Al-pyroxene and fine-grained anorthite.

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