期刊
ORGANIC GEOCHEMISTRY
卷 33, 期 8, 页码 945-952出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0146-6380(02)00060-8
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Stable and radioactive carbon isotopic compositions of particle size fractions of a surface sediment from the Ems-Dollard estuary vary considerably with particle size. The organic material in the fine fractions (<20 mum) has considerably higher C-14 values ((14)a-80%) than that in the coarse fractions (52%) and has higher delta(13)C values (average of -23parts per thousand and -25.6parts per thousand, respectively). This shows that OM in the fine and the coarse fractions has different sources. The organic carbon in the fractions with particle sizes < 20 mum is mainly imported from the North Sea. The contribution of material from the Ems river appears negligible. The carbon isotopic composition of the coarse fractions points to a terrestrial contribution. Discrete organic fragments are found of both terrestrial and marine/estuarine origin. (C) 2002 Elsevier Science Ltd. All rights reserved.
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