Carbon in dark inclusions of the Allende meteorite

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Allende Meteorite, Carbon, Inclusions, Chemical Analysis, Energy Spectra, Proton Energy, Meteorites, Stony Meteorites, Cv3 Chondrites, Carbonaceous Chondrites, Inclusions, Allende, Samples, Meteorite, Carbon, Chemistry, Compostion, Microprobe Methods, Matrix, Laboratory Studies, Experiments, Procedure, Diagrams, Energy, Spectra, Analysis

Scientific paper

Carbon contents of three dark inclusions (DI's) of the Allende meteorite, measured chemically, range from 0.56 to 1.17 wt pct. When one includes the data reported by Bunch, Chang, and Ott (1980), the lower limit is 0.44 pct. The C-concentration map of a 1.6 x 1.6 sq mm area straddling the boundary of a DI and matrix, or of a DI and its dark halo, obtained with a C-12(d,p)C-13 nuclear microprobe, shows that the C-content of the core of the DI is very uniform, and that the C-content of the rim is 2.9 + or - 0.3 times larger. Variability of the C-content of matrix and matrix-like areas of Allende appears to be the rule. DIs cannot be a reworked bulk Allende, or a precursor for bulk Allende without the addition or, respectively, removal of significant amounts of carbon. However, some type 1 DIs might be reworked Allende matrix or precursor matter for that matrix.

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