A preliminary study on fingerprinting approach in marine sediment dynamics with the rare earth elements

ZHOU Xiao-jing; JIANG Fu-qing; LI An-chun; MENG Qing-yong

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ZHOU Xiao-jing, JIANG Fu-qing, LI An-chun, MENG Qing-yong. A preliminary study on fingerprinting approach in marine sediment dynamics with the rare earth elements[J]. Haiyang Xuebao, 2010, 32(1): 67-82.

Citation:

ZHOU Xiao-jing, JIANG Fu-qing, LI An-chun, MENG Qing-yong. A preliminary study on fingerprinting approach in marine sediment dynamics with the rare earth elements[J]. Haiyang Xuebao, 2010, 32(1): 67-82.

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A preliminary study on fingerprinting approach in marine sediment dynamics with the rare earth elements

1.
Key Laboratory of Chinese Academy of Sciences for Marine Geology & Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071, China; ;Graduate School,Chinese Academy of Sciences,Beijing 100049, China
2.
Key Laboratory of Chinese Academy of Sciences for Marine Geology & Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071, China;

Funds: 无

Received Date: 2008-12-05

Abstract

Abstract

Total of 146 sediment samples were collected from the shelf of the East China Sea and five rivers, including the Huanghe River, the Changjiang River, the Qiantang River, the Oujiang River and the Minjiang River. The sediment grain-size and the content of rare earth element (REE) were measured with a laser particle size analyzer and an ICP-MS respectively. Results show that the REE absolute content and the ratio of LREE (light REE) to HREE (heavy REE) content are different in the sediments between rivers. There are higher REE contents in being less than 2 μm and 2~31 μm fractions in Changjiang Estuary surface sediments, and the bulk sediment REE contents are dominated by the corresponding values of those prevalent size-fractions. In the study area, the REE absolute contents of sediments are higher near the estuaries, and they trend downward in seaward direction on the inner shelf of the East China Sea. The ratio of LREE to HREE content has a tendency of increase southward from 28° N, whilst hydrodynamic conditions are dominated by the spacial distributions of the surficial sediment^’s REE parameters. In some cases, the current flows tend to remove the coarser light grains from initial populations, whilst deposit the finer heavy mineral grains. In most situations, the currents will change the ratio of sediment constituents, for example, between silts and clays. As a result, the various values of the REE absolute content or ratio of LREE to HREE content in different bulk sediments result from the change of size-fractions, rather than represent their different sources. Under the long-term stable hydrodynamic environment, i.e., on the East China Sea shelf, a new sediment transport model based on the size and density gradation concept may help to understand the spatial distribution patterns of REE parameters.

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References(35)

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