Genetic classification of fuels
2001
Veski, R. (Peat Info Ltd., Tallinn (Estonia))
As an addition to our genetic classification of caustobioliths carbon-based fuels are classified more widely as of: abiogenic (which were the only genetic type of hydrocarbons and related compounds in prebiological Earth; biomass of phototrophic and heterotrophic organisms; caustobioliths; and processed ones. Caustobioliths are divided after H. Potonie according to the type of plant biomass as: sapropeliths (from biomass of lower phototrophic aquatic plants); liptobiolithis (from the most stable residue of decomposed higher land plants, such as waxes, resins, spores etc.); humites (from the biomass of partially decayed higher land and swamps plants); and naphtides (naphta and its derivatives). The most caustobioliths are of mixed origin. When buried, the secretions and remains of organisms first pass the soil stage (the upper layer of the zone of the zone of weathering). In soil stage lower plant and roots of higher plants are in mutual action with the substrate. The next stage is microbial which is determined by living heterotrophs, in its lower part only by microorganisms which are not in the state of anabiosis. These two stages specify the upper part of the known peat stage. The following stages are widely known. Processed fuels are divided as mechanically, physically, chemically, geologically and biologically processed fuels, in most cases by combining the mentioned levels
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