Geochemical characteristics of the high reduction zone of stenols in Suwa sediments and the environmental factors controlling the conversion of stenols into stanols

Details Geochemical characteristics of the high reduction zone of stenols in Suwa sediments and the environmental factors controlling the conversion of stenols into stanols Geochemical characteristics of the high reduction zone of stenols in Suwa sediments and the environmental factors controlling the conversion of stenols into stanols

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..349n&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Issue 4, pp.349-357

Computer Science

8

Scientific paper

Detailed geochemical analyses of the high reduction zone in Lake Suwa sediments suggested that the stenol to stanol conversion rate in this zone is primarily controlled by the proportion of autochthonous contribution to organic matter and the redox potential in these sediments, and that land-derived stenols were kept insensitive to hydrogenation in lacustrine sediments as compared with those derived from plankton. These results indicate that stanols derived directly from organisms on land may contribute significantly to stanols found in lacustrine sediments which contain minor proportions of autochthonous organic materials. In order to express the relative autochthonous vs terrigenous contribution to organic matter in lacustrine sediments, the autochthonous contribution index (ACI) was defined based on the characteristic distribution of sterol in plankton and land plants. It systematically increased from river inlet towards lake center and correlated closely with the 13 C value in same sediments. This strongly indicates that ACI is a useful indicator providing informatiom on autochthonous vs terrigenous contribution to the organic material in lacustrine sediments.

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