Origin of organic matter in early solar system—V. Further studies of meteoritic hydrocarbons and a discussion of their origin |
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Authors: | Martin H Studier |
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Institution: | Chemistry Division, Argonne National Laboratory Argonne, Illinois 60439 USA; Enrico Fermi Institute and Department of Chemistry, University of Chicago, Chicago, Illinois 60637 USA |
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Abstract: | The Murchison meteorite contains aliphatic and aromatic hydrocarbons similar to those made in static Fischer-Tropsch-type syntheses. Principal compound classes above C8 are n-alkanes, mono- and dimethylalkanes, alkenes, alkylbenzenes and -naphthalenes. Below C8, n-alkanes are virtually absent; instead, benzene, toluene, branched alkanes dominate. The CH4/C2H6 ratio is greater than 30, possibly greater than 700. Isoprenoids from C17 to C20 occur in a surface rinse but not in subsequent extracts and appear to be terrestrial contaminants. Thiophenes, porphyrin-like pigments and chlorobenzenes were also found; the latter appear to be contaminants. In the Allende meteorite, only methane, benzene, toluene and an aromatic polymer seem to be indigenous. |
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