Other
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1001a&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, April 1985, p. 1001-1022.
Other
9
Carbonaceous Chondrites, Chemical Composition, Magnetite, Mineralogy, Petrology, Electron Microscopy, Histograms, Microstructure, Meteorites, Allende, Cv3 Chondrites, Carbonaceous Chondrites, Formation, Stony Meteorites, Fremdlinge, History, Cais, Calcium, Aluminum, Cores, Inclusions, Minerology, Chemistry, Comparisons, Composition, Mantles, Description, Boundaries, Texture, Chronology, Zoning, Recrystallization, Thermal Effects, Temperature, Cooling Rate
Scientific paper
The structure and composition of Willy, a 150-micron-diameter Fremdling in CAI 5241 from the Allende meteorite, are investigated using optical, secondary-electron, and electron-backscatter microscopy and electron-microprobe analysis. The results are presented in diagrams, maps, tables, graphs, and micrographs and compared with those for other Allende Fremdlinge. Willy is found to have a concentric-zone structure comprising a complex porous core of magnetite, metal, sulfide, scheelite, and other minor phases; a compact magnetite-apatite mantle; a thin (20 microns or less) reaction-assemblage zone; and a dense outer rim of fassaite with minor spinel. A multistage formation sequence involving changes in T and fO2 and preceding the introduction of Willy into the CAI (which itself preceded CAI spinel and silicate formation) is postulated, and it is inferred from the apparent lack of post-capture recrystallization that Willy has not been subjected to temperatures in excess of 600 C and may represent the precursor material for many other Fremdlinge.
Armstrong Thomas J.
El Goresy Ahmed
Wasserburg Gerald J.
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