Computer Science
Scientific paper
Nov 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36.1185b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 11, pp.1185-1203
Computer Science
8
Scientific paper
As part of a larger study of diagenesis in the sediment of Saanich Inlet, several groups of organic compounds were isolated from the sediment, identified, their concentration quantitatively determined and where possible, the C 13 / C 12 isotope ratio determined. Four 2.5 m cores and one 35 m core were studied. It was found that chlorins show the greatest decrease with depth followed by amino acids and then fatty acids. Aliphatic straight chain hydrocarbons show little change in concentration with depth of sediment, although the aromatic hydrocarbon perylene gave evidence for in situ formation. Fulvic acids, highly abundant at the surface of the sediment, decreased significantly with depth, whereas humic acids did not appear to show any significant change. The amount of insoluble residue increased with depth, constituting the dominant organic carbon form at 17 m and below. There is no strong evidence for significant hydrocarbon formation under mild conditions prevailing, although C 16 fatty acids appear to be degrading preferentially and may partially convert to the C 15 paraffin. There is no evidence for in situ formation of isoprenoid hydrocarbons from the phytol side chain of chlorophyll. Pristane and phytane, present in small concentrations at the sediment surface, decrease or disappear with burial. Carbon isotope ( C 13 / C 12 ) ratios, were used to determine the relative amounts of organic matter derived from terrigenous and marine sources. Humic acids appear to form largely from plankton-derived material and not from terrigenous plant or soil sources.
Baedecker J.
Brown Frederick S.
Kaplan Isaac R.
Nissenbaum Arie
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