Other
Scientific paper
Oct 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969gecoa..33.1183b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 33, Issue 10, pp.1183-1194
Other
3
Scientific paper
Long-chain paraffins and other hydrocarbons are formed from wax and cuticle constituents in brown and subbituminous coals with increasing depth of burial. The formation takes place mainly at an early stage of diagenesis, as the carbon content increases from about 70% to 82% in the transformation to high-volatile bituminous coal. It is suggested that the highly paraffinic crude oils which have been found in the offshore area of the Gippsland Basin in the Latrobe Valley Coal Measures have formed by the same geochemical reactions, largely from land plant material consisting of waxy leaf, pollen, and spore coatings. When brown coals from shallow depths in the Basin were heated under conditions which would be expected to accelerate diagenetic reactions, the extractable waxes consisting partly of even-carbon-numbered n-alkanoic esters of even-numbered n-alkanoic acids were converted to mixtures of n-alkanes and other hydrocarbons. The alcohol moieties of these straight chain ester waxes yielded even-numbered n-alkanes, apparently via intermediate formation of olefins, but the acid fragments gave odd-numbered n-alkanes by decarboxylation. When subjected to the same treatment, the insoluble cuticular material in the coal also yielded a mixture of odd- and even-numbered alkanes together with branched and other hydrocarbons. The insoluble pollen coal fraction acted as a decarboxylation catalyst in the formation of odd-number alkanes from the acid fragments of the soluble esters.
Brooks J. D.
Smith Justin W.
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