Other
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..945b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, June 1981, p. 945-970. Research supported by the Natural Environment Research Council
Other
59
Carbonaceous Chondrites, Meteoritic Composition, Meteoritic Microstructures, Minerals, Silicates, Carbonates, Electron Microscopy, Iron, Magnesium, Magnetite, Matrix Materials, Olivine, Pyroxenes, Single Crystals, Spinel, Sulfides, X Ray Analysis, Meteorites, Carbonaceous Chondrites, Minerals, Matrix, Phyllosilicates, Electron Microscopy, X-Ray Analysis, Microstructure, Phases, Iron, Data, Murchison Meteorite, Cold Bokkeveld Meteorite, Nawapali Meteorite, Silicon, Cochabamba Meteorite, Morphology, Crystals,
Scientific paper
TEM, HRTEM, HVEM, and SEM methods, coupled with energy dispersive X-ray analysis, are used in studying the microstructure and the phases making up the matrix of the carbonaceous chondrites Murchison, Cold Bokkeveld, Nawapali, and Cochabamba. A wide variety of phyllosilicate morphologies is found to occur in each. It is noted that very small crystals and clasts of olivine, pyroxene and other unhydrated minerals are mixed intimately with the phyllosilicates. Intergrowths of carbonates and sulfides within the phyllosilicates also occur, as does a ubiquitous spongy material which though difficult to characterize contains elementary phyllosilicate units and embryo crystals. The identifiable large crystalline phyllosilicates are mainly Fe-rich serpentine-group minerals and intermediate more Mg-rich chrysotilelike group members, with characteristic basal layer spacings of approximately 7.0-7.4 A. It is found that the Fe/Si and Mg/Si ratios vary on a sub-micron scale and that the morphologies of the larger phyllosilicate crystals correlate broadly with these variations. Small crystals of sodium chloride and potassium chloride are identified, occluded with a predominantly organic mass.
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