期刊
CHEMICAL GEOLOGY
卷 218, 期 1-2, 页码 63-72出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemgeo.2005.01.025
关键词
particulate organic matter; triangle C-14; delta C-13; surface sediments; coastal areas; terrestrial organic matter
Accelerator mass spectrometry was used to measure radiocarbons of riverine suspended particles and sediments from the estuary, continental shelf and slope off the coast of Tokachi River in Japan. The spatial distribution of Delta(14)C and delta(13)C values of sedimentary organic matter was divided into those of (1) estuary, (2) continental shelf, and (3) continental slope. For shelf sediments, respective maxima can be seen for Delta(14)C value, ON ratio and organic carbon content at a station near the river mouth. The mean grain size of surface sediments also exhibits a similar trend. The delta(13)C values show a minimum near the river mouth. The shelf composition does not appear to be a simple mixture of terrestrial and marine origin. From the above data, it is considered that the spatial distribution of Delta(14)C and delta(13)C values may reflect variations in dispersion and deposition processes together with the size fractionation of riverine suspended particles, the resuspension of sediments, and differences in the contribution of marine organic matter. (c) 2005 Elsevier B.V All rights reserved.
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