广东近岸海湾表层沉积物的稀土元素特征及其物源示踪

doi:10.11978/j.issn.1009-5470.2012.02.010

Abstract

Abstract: A systematic study of rare earth elements (REE) within the surface sediments from 10 bays situated along the coast of Guangdong Provence, China, has facilitated a more rigorous understanding of constraints on sediment provenance in the area. The results show that REE concentrations are similar within a single bay, but vary considerably (133.58–251.77 mg · kg ^-¹ ) among the bays. The chondrite-normalized distribution patterns show the typical enrichment of light REEs (La to Eu) relative to heavy REEs (Gd to Lu), and an apparent depletion of Eu, which is diagnostic of a terrigenous sediment source. Obvious enrichments of the middle REEs (Sm to Ho) in the PAAS-normalized ( Post-Archean Australian Shale ) distribution patterns of these bay sediments are similar to results reported from large rivers in China. Comparing the REE composition of the bay sediments with those of adjoining fluvial sediments and with the bedrock of the surrounding drainage basins, the bedrock of the surrounding drainage basins are indicated as the dominant sediment source. The uniform REE distribution patterns and MREE enrichments confirm that the sediments are derived from the material transported by the streams and rivers that discharge into the bays.

Key words: rare earth element, sediments, bay, source, Guangdong

CLC Number:

P736.2

YAN Bin,MIAO Li,HUANG Wei-xia,CHEN Zhong,LU Jun,GU Sen-chang,YAN Wen. Characteristics of rare earth elements in the surface sediments from the bays along the coast of Guangdong Province and their source tracers[J].Journal of Tropical Oceanography, 2012, 31(2): 67-79.

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Characteristics of rare earth elements in the surface sediments from the bays along the coast of Guangdong Province and their source tracers

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