Abstract
Bitumens solvent extracted from harbolite and Avgamasya asphaltite after treatment with acid under reducing conditions were separated by solvent partition and column chromatography. The principal fractions, together 77 and 82% of the bitumens, were sulphur-rich neutral oil and asphaltene fractions which were shown by size-exclusion chromatography and spectroscopy, particularly 1H and 13C nuclear magnetic resonance, to consist of high-molecular-weight structures carrying alkyl (some with long chains) and naphthenic structures. The alkane fractions were analysed by high-resolution gas chromatography and contain n-alkanes, isoprenoids and triterpanes. The asphaltite bitumens are classified as aromatic-asphaltic oils derived by alteration during migration of aromatic intermediate oils originating from open-water marine sediments laid down in an anoxic environment.
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