Intergrown mica and montmorillonite in the Allende carbonaceous chondrite

Details Intergrown mica and montmorillonite in the Allende carbonaceous chondrite Intergrown mica and montmorillonite in the Allende carbonaceous chondrite

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.299..326t&link_type=abstract

Nature, vol. 299, Sept. 23, 1982, p. 326, 327.

Computer Science

24

Carbonaceous Chondrites, Meteoritic Composition, Mica, Montmorillonite, Electron Microscopy, Spectroscopic Analysis

Scientific paper

High resolution transmission electron microscopy (HRTEM) observations were made of a mixture of mica and montmorillonite from fine-grained calcium, aluminum inclusions (CAI) in the Allende C3(V) meteorite. A petrographic thin section having a diameter of 4 mm contained CAI fragments ranging from less than 1 to 50 microns. The observed textural and chemical characteristics placed the inclusion in the fine-grained alkali-rich spinel aggregate category of Warks' (1979) classifications of CAIs and as type 3 in Kornacki's classifications of fine grains in Allende. Chemical analyses were performed on the phyllosilicate grains observed in the TEM scan by means of an X ray observed, and the proximity to the matrix boundary suggests a metamorphism which included aqueous alteration at a relatively low temperature.

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