Organic compounds in meteorites--V. Gas chromatographic-mass spectrometric studies on the isoprenoids and other isomeric alkanes in graphitic nodules of iron meteorites

Details Organic compounds in meteorites--V. Gas chromatographic-mass spectrometric studies on the isoprenoids and other isomeric alkanes in graphitic nodules of iron meteorites Organic compounds in meteorites--V. Gas chromatographic-mass spectrometric studies on the isoprenoids and other isomeric alkanes in graphitic nodules of iron meteorites

Sep 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..995g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 34, Issue 9, pp.995-1005

Computer Science

3

Scientific paper

Several specimens of graphite-troilite nodules from three different iron meteorites (Canyon Diablo, Odessa and Cosby's Creek) were studied following the same general techniques applied to the analysis of carbonaceous chondrites (Part III of this series). The results obtained in all cases are very similar to those obtained with the carbonaceous chondrites, although the amount of alkanes in the nodules is much lower, ranging from 0.32 to 9.36 ppm. These hydrocarbons show only a slight odd over even predominance except in one case, Cosby's Creek, where a marked odd predominance with a maximum at C 15 is readily apparent from the gas Chromatographic pattern. A total of nine homologous series have been identified mass spectrometrically: the n-alkane series (C 13 -C 26 ); the 2-, 3-, 4-, 6-methyl alkane series; the two isoprenoid series, 2,6,10-trimethyl and 2,6,10,14-tetramethyl alkanes (C 16 -C 19 and C 19 -C 21 , respectively); and two series of monocycloalkanes (cyclohexyl and cyclopentyl). The isoprenoids were present in all of the meteoritic nodules analyzed with the same major maximum at C 19 (pristane), the secondary maximum at C 16 (methyl farnesane) and the minimum at C 17 . In several instances samples were taken from different parts of the nodules in order to study the homogeneity of the alkane distribution within the entire nodule. Invariably the inner parts had from three to seven times less alkanes than their surfaces, and the relative content of low molecular weight alkanes appeared to be higher inside of the nodule than at the exposed surfaces. Also, a significant increase in the amount of isoprenoids relative to the n-alkanes was observed in the inner portions of the graphite nodules. The presence and distribution of these types of compounds within the graphitic nodules embedded in the iron meteorites cannot be readily explained unless the contribution of extraneous material from the terrestrial environment is considered.

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