Geochemical characteristics and provenance implication of rare earth elements in surface sediments from bays along Guangdong Coast, Southeast China |
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Authors: | Bin Yan Wen Yan Li Miao Weixia Huang and Zhong Chen |
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Institution: | (1) CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, No. 164 West-Xingang Road, Guangzhou, 510301, Guangdong, People’s Republic of China;(2) Graduate University of Chinese Academy of Sciences, No. 19 Yuquan Road, Beijing, 100039, People’s Republic of China |
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Abstract: | A systematic study of the granulometric properties and the occurrence and distribution of rare earth elements (REE) within
surface sediments from ten bays situated along the coast of Southeast 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) among the bays. The chondrite-normalized distribution patterns show the typical
enrichment of light REEs (LREEs: La–Eu) relative to heavy REEs (HREEs: Gd–Lu), and an apparent depletion of Eu, which is diagnostic
of a terrigenous sediment source. Obvious enrichments of the middle REEs (MREEs: Sm–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 latter are indicated as the dominant sediment source. The uniform REE distribution patterns, and MREE
enrichments, prove that the sediments are derived from the material transported by the streams and rivers that discharge into
the bays. |
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