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Source indicators of humic substances and proto-kerogen - Stable isotope ratios, elemental compositions and electron spin resonance spectraStable isotope ratios of C, N and H, elemental compositions, and electron spin resonance (ESR) data of humic acids and proto-kerogens from twelve widely varying sampling locations are presented. Humic acids and proto-kerogens from algal sources are more aliphatic and higher in N than those from higher plant sources. Oxygen content appears to represent a measure of maturation, even in Recent sediments, and S content may reflect redox conditions in the environment of deposition. The ESR data indicate that the transformation of humic substances to proto-kerogens in Recent sediments is accompanied by an increase in aromatic character. A combination of stable carbon isotope ratio and H/C ratio may be a simple but reliable source indicator which allows differentiation of marine-derived from terrestrially-derived organic matter. The stable nitrogen isotope ratios are useful indicators of nitrogen nutrient source. Deuterium/hydrogen isotope ratios appear to reflect variations in meteoric waters and are not reliable source indicators.
Document ID
19780060588
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stuermer, D. H.
(California Univ. Los Angeles, CA, United States)
Peters, K. E.
(California Univ. Los Angeles, CA, United States)
Kaplan, I. R.
(California, University Los Angeles, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1978
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 42
Subject Category
Earth Resources And Remote Sensing
Accession Number
78A44497
Funding Number(s)
CONTRACT_GRANT: EY-76-S-0034-PA-134
CONTRACT_GRANT: NGR-05-007-221
Distribution Limits
Public
Copyright
Other

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