Origin of organic matter in early solar system--V. Further studies of meteoritic hydrocarbons and a discussion of their origin

Details Origin of organic matter in early solar system--V. Further studies of meteoritic hydrocarbons and a discussion of their origin Origin of organic matter in early solar system--V. Further studies of meteoritic hydrocarbons and a discussion of their origin

Feb 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..189s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 36, Issue 2, pp.189-215

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37

Scientific paper

The Murchison meteorite contains aliphatic and aromatic hydrocarbons similar to those made in static Fischer-Tropsch-type syntheses. Principal compound classes above C 8 are n -alkanes, mono- and dimethylalkanes, alkenes, alkylbenzenes and -naphthalenes. Below C 8 , n -alkanes are virtually absent; instead, benzene, toluene, branched alkanes dominate. The CH 4 /C 2 H 6 ratio is greater than 30, possibly greater than 700. Isoprenoids from C 17 to C 20 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. A comprehensive review of current evidence shows that Fischer-Tropsch-type reactions can account for most principal features of meteorite organic matter: hydrocarbons, nitrogen bases, amino acids, carbon-isotope fractionations and possibly pigments. Some features (aromatic hydrocarbons) require a reheating stage; others such as S- and Cl-compounds and the aromatic `polymer' remain unexplained and need to be investigated. No other process is known at present that accounts for an equally wide range of evidence.

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