Rare earth element fingerprints in Korean coastal bay sediments: Association with provenance discrimination
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- 作者：Jeongwon Kang ; Han Jun Woo ; Seok Jang ; Kap-Sik Jeong ; Hoi-Soo Jung…
- 关键词：Key wordsrare earth elements ; REE fractionation ; sediment origin ; tidal flat ; Gomso Bay
- 刊名：Ocean Science Journal
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：51
- 期：3
- 页码：305-316
- 全文大小：1,842 KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Geosciences
Oceanography
Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution - 出版者：Korean Ocean Research and Development Institute (KORDI) and the Korean Society of Oceanography, co-p
- ISSN：2005-7172
- 卷排序：51
文摘
Rare earth elements (REEs: La-Lu) in surface sediments collected from the mouth and middle tidal flats of Gomso Bay, South Korea, in August 2011 and May 2012 were analyzed to investigate the fine-grained sediment provenance. The upper continental crust (UCC)-normalized light REEs (LREEs: La to Nd) were more enriched than the middle REEs (MREEs: Sm to Dy) and heavy REEs (HREEs: Ho to Lu), resulting in large (La/Yb)UCC (1.9 ± 0.4) to (Gd/Yb)UCC (1.4 ± 0.2) ratios. The monthly (La/Yb)UCC values differed between the mouth and middle tidal flats due to deposition of fine-grained sediments that originated from distant rivers (the Geum and Yeongsan) and the Jujin Stream, located on the southern shore of the inner bay. We observed relative reductions in the (La/Yb)UCC value and REE content in the sediments from the mouth of the bay compared with those from Jujin Stream sediments. Confined to the middle tidal flat around the KH Line of Jujin Stream, the sediments, most enriched in LREEs but depleted in Eu, were distributed in August as strong Jujin Stream runs. Here, we suggest that an increase in LREE/HREE and decrease in MREE/LREE ratios can be used as a proxy to identify the Jujin Stream provenance in mixed riverine sediments and to trace Jujin Stream sediments within the Gomso Bay tidal flat, especially in the summer rainy season.