Replacement textures in CAI and implications regarding planetary metamorphism

Details Replacement textures in CAI and implications regarding planetary metamorphism Replacement textures in CAI and implications regarding planetary metamorphism

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..707m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 47, April 1983, p. 707-721.

Computer Science

11

Aluminum, Calcium, Carbonaceous Chondrites, Inclusions, Metamorphism (Geology), Meteoritic Composition, Petrography, Photomicrography, Textures, Meteorites, Texture, Allende, Calcium, Aluminum, Inclusions, Planets, Metamorphism, Chemistry, Melilite, Formation, Crystallization, Cais, Condensation, Hypotheses, Pyroxene, Parent Bodies, Comparisons, Oxygen, Isotopes, Heterogenesis, Origin, Source, Samples, Meteorite

Scientific paper

Textural and chemical features of five coarse-grained, calcium-aluminium-rich inclusions (CAI) from the Allende meteorite indicate that some of the melilite in these inclusions was formed by a secondary metamorphic event and not by primary crystallization from a melt or by a sequential nebular condensation process. The authors believe that the most likely environment for this metamorphic process is on a small planetary body, and not in the solar nebula. The results of the study are compatible with oxygen isotopic heterogeneities within CAI, and provide a mechanism for producing lower temperature alteration phases and the rim phases found in these inclusions. The authors conclude that planetary processes must thus be considered in the formation history of CAI, and that it is necessary to reconsider the classification system of these objects in light of the replacement process proposed in the paper.

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