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CARBON IN DARK INCLUSIONS OF THE ALLENDE METEORITE
Author(s) -
Heymann D.,
Stap C.C.A.H.,
Vis R.N.,
Verheul H.
Publication year - 1987
Publication title -
meteoritics
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0026-1114
DOI - 10.1111/j.1945-5100.1987.tb00881.x
Subject(s) - allende meteorite , meteorite , chondrite , matrix (chemical analysis) , carbon fibers , carbonaceous chondrite , astrophysics , chemistry , analytical chemistry (journal) , mineralogy , geology , physics , astrobiology , materials science , environmental chemistry , composite material , chromatography , composite number
Carbon contents of three Dark Inclusions (DI's) of the Allende meteorite, measured chemically, range from 0.56 to 1.17 weight %. When one includes the data reported by Bunch, Chang, and Ott (two DI's), the lower limit is 0.44%. The C‐concentration map of a 1.6 × 1.6 mm 2 area straddling the boundary of a DI and matrix, or else of a DI and its dark halo, obtained with a 12 C (d,p) 13 C 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 ± 0.3 times larger. Variability of C‐content of matrix and matrix‐like areas of Allende appears to be the rule. DI's cannot be reworked bulk Allende, or precursor for bulk Allende without the addition, respectively removal of significant amounts of carbon. However, some Type 1 DI's might be reworked Allende matrix or precursor matter for that matrix.