Occurrence and transformation of phyllocladanes in brown coals from Nograd Basin, Hungary

Details Occurrence and transformation of phyllocladanes in brown coals from Nograd Basin, Hungary Occurrence and transformation of phyllocladanes in brown coals from Nograd Basin, Hungary

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2065a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 8, pp.2065-2073

Computer Science

1

Scientific paper

Phyllodactanes are the major components of the lipid extracts of two series of brown coals from the Nograd Basin (Northern Hungary). In this basin coalification was induced by thermal stress of volcanic origin which determined the isomeric composition of these compounds. Depending on the degree of maturation the 16 (H)-isomer decreases in abundance relative to the more geochemically stable 16 (H)-isomer, the presumed equilibrium ratio being 0.3. Laboratory thermal degradation experiments have confirmed the feasibility of this transformation, showing that phyllocladene and isophyllocladene are intermediate products of the process. Variable amounts of retene and simonellite are also found, but no evidence is obtained of abietane-type precursors. Nevertheless, a close relationship of the retene-phyllocladane ratio with maturity, represented by the H / C ratio, is observed. As an explanation, it is suggested the thermally induced formation of retene from phyllocladanes, simonellite being an intermediate of the proposed reaction. Further evidence for this hypothesis has been obtained from laboratory simulation experiments. Finally, the presumed isomerization and aromatization rates of these diterpenoids have been compared for the series of samples, pointing to a promising tool for assessing the geochemical history of coal basins.

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