The microstructure of minerals in coarse-grained Ca-Al-rich inclusions from the Allende meteorite

Details The microstructure of minerals in coarse-grained Ca-Al-rich inclusions from the Allende meteorite The microstructure of minerals in coarse-grained Ca-Al-rich inclusions from the Allende meteorite

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..769b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 48, April 1984, p. 769-783. Sponsorship: Natural Environment Research Cou

Computer Science

10

Aluminum, Calcium, Carbonaceous Chondrites, Inclusions, Meteoritic Composition, Microstructure, Crystal Dislocations, Electron Microscopy, Feldspars, Perovskites, Pyroxenes, Spinel, Meteorites, Structure, Minerals, Grains, Texture, Calcium, Aluminum, Cais, Inclusions, Allende, Chemistry, Electron Microscopy, Composition, Features, Comparisons, Tem, Phases, Density, Crystals, Description, Size, Morphology, Mineralogy, Formation, Temperature, Annealing, Precipitates, Cooling, Crystallization, Abundance, Surfa

Scientific paper

Transmission electron microscopy (TEM) is used to investigate the microstructure and microchemistry of minerals in Ca-Al-rich, coarse-grained inclusions (CAI) from the meteorite. The spinels contain only low to moderate dislocation densities and are characterized by a ubiquitous, fine black spotty texture that is thought to originate from a slightly nonstoichiometric composition. Whereas the Ti-Al-pyroxenes are relatively devoid of features, they contain veins of secondary phases apparently deposited in unhealed cracks. Chromite is identified in the veins, indicating transport of oxidized iron during alteration. The melilites show the greatest variety of microstructures and are the most heavily altered phase in CAI. High dislocation densities are common and the crystals exhibit considerable internal strain, suggesting that they have not been annealed.

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