Physics
Scientific paper
Jun 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..653s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 6, pp.653-671
Physics
11
Scientific paper
Ninety-four individual samples from three cores of the Argentine Basin (V-15-142, V-15-141, and V-15-140) were analyzed for organic carbon, total- and organic nitrogen, fixed ammonium and amino acid-N. Significant quantities of nitrogen, estimated to range from 80 to 240 ppm, occurred as ammonium trapped within the lattice structures of clay minerals. From 23·0 to 40·8 per cent of the organic nitrogen occurred in the form of amino acids. The C/N ratios ranged from 7·1 to 16·9; C/organic N ratios varied from 9·4 to 18·5. Variations with depth in the C/organic N ratio, and in the amino acid content of the organic matter, were interpreted in terms of the sedimentary environment and diagenetic changes following burial. Fluctuations in the distribution of carbon and organic nitrogen with depth were related to alternations in warm and cool climates during Quaternary times.
Cheng C.-N.
Stevenson F. J.
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