Early diagenesis of fatty acids in lacustrine sediments--II. A statistical approach to changes in fatty acid composition from recent sediments and some source materials

Details Early diagenesis of fatty acids in lacustrine sediments--II. A statistical approach to changes in fatty acid composition from recent sediments and some source materials Early diagenesis of fatty acids in lacustrine sediments--II. A statistical approach to changes in fatty acid composition from recent sediments and some source materials

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1825m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 12, pp.1825-1834

Computer Science

2

Scientific paper

The percentage composition and total amounts of fatty acids from plankton, live and dead plants (waterweeds and higher plants) and a forest soil, considered as possible origins of autochthonous and allochthonous organic materials in lacustrine sediments, have been determined by gas-liquid chromatography. Statistical analyses were carried out by computing distance index of the fatty acid composition between these source materials and the uppermost sediment from Lake Suwa, and the composition diversity index (CDI) of fatty acids in the recent sediments from Lake Suwa. The distance index indicated that the fatty acid composition in the uppermost sediment is similar to those in diatoms, Zooplankton and forest soil, and the values for dead leaves were smaller than for live ones. It suggests that the autolysis and/or decomposition processes prior to deposition onto the top sediment makes the fatty acid composition of organic debris similar to the uppermost sediment. The CPI in recent sediments varied irregularly, whereas the CDI increased during early diagenesis to yield a value comparable to ancient sediments.

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