Physics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1223a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 9, pp.1223-1230
Physics
3
Scientific paper
n -Alkanes in the soluble organic matter extracted from a series of vitrinite and sporinite concentrates have been analysed by gas chromatography. The macerals were isolated from coals ranging in rank from 77.1% to 86.6% carbon (vitrinite: dry, ash-free), and yields of n -alkanes ranged from 10 to 580 ppm for vitrinites and from 20 to 970 ppm for sporinites. The maximum yields were found at a rank of 85.4% C from vitrinites and 86.6% C from sporinites. Distribution maxima of the n -alkanes, as shown by gas chromatography, range from C 27 and C 29 at lower ranks to as low as C 16 at higher ranks. The distributions also show a progressive decrease in the preference of odd-carbon-number homologues with increasing rank. Virtually smooth distributions were attained in high-volatile bituminous A coals. Quantitative data show that the loss of the odd-carbon-number preference occurred, for the most part, while individual long-chain homologues increased in concentration. There is a progressive increase in the amounts of shorter-chain n -alkanes with increasing rank. It is suggested that sequential processes may have occurred whereby the rate of formation of long-chain n -alkanes in high-volatile bituminous A rank macerals becomes slower than their rate of subsequent fragmentation to shorter chain lengths. Consequently, assuming derivation from the insoluble maceral matrices, the chain-length distributions of parent n -alkyl structures within the insoluble material may retain characteristics pertaining more to the nature of the source organic matter at the time of deposition than do the extractable n -alkane patterns, especially at higher ranks.
Allan John
Douglas A. G.
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