Post-depositional redistribution processes and their effects on middle rare earth element precipitation and the cerium anomaly in sediments in the South Korea Plateau, East Sea
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Title
- Post-depositional redistribution processes and their effects on middle rare earth element precipitation and the cerium anomaly in sediments in the South Korea Plateau, East Sea
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Author(s)
- Kang, Jeongwon; Jeong, Kap-Sik; Cho, Jin Hyung; Lee, Jun Ho; Jang, Seok; Kim, Seong Ryul
- KIOST Author(s)
- Kang, Jeong Won(강정원); Cho, Jin Hyung(조진형); Lee, Jun-Ho(이준호); Jang, Seok(장석)
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Alternative Author(s)
- 강정원; 정갑식; 조진형; 이준호; 장석; 김성렬
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Publication Year
- 2014-03-15
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Abstract
- We sampled two box-core sediments from the slope of the eastern South Korea Plateau (SKP) in the East Sea (Sea of Japan) at water depths of 1400 and 1700 m. Two chemical fractions of extractable (hydroxylamine/acetic acid) and residual rare earth elements (REEs) together with Al, Ca, Fe, Mg, Mn, P. S, As, Mo, and U were analyzed to assess the post-depositional redistribution of REEs. Extractable Fe and Mn are noticeably abundant in the oxic topmost sediment layer (<3 cm). However, some trace elements (e.g., S, As, Mo, U) are more abundant at depth, where redox conditions are different. Analysis of upper continental crust (UCC)-normalized (La/Gd)(UCC), (La/Yb)(UCC), and (Ce/Ce*)(UCC) revealed that the extractable REE is characterized by middle REE (MREE) enrichment and a positive cerium (Ce) anomaly, different from the case of the residual fraction which shows slight enrichment in light REEs (LREEs) with no Ce anomaly. The extractable MREEs seem to have been incorporated into high-Mg calcite during reductive dissolution of Fe oxyhydroxides. In the top sediment layer, the positive Ce anomaly is attributed to Ce oxide, which can be mobilized in deeper oxygen-poor environments and redistributed in the sediment column. In addition, differential concentrations of Ce and other LREEs in pore water appear to result in variable (Ce/Ce*)(UCC) ratios in the extractable fraction at depth. (C) 2013 Elsevier Ltd. All rights reserved.
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ISSN
- 1367-9120
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/2890
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DOI
- 10.1016/j.jseaes.2013.11.019
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Bibliographic Citation
- JOURNAL OF ASIAN EARTH SCIENCES, v.82, pp.66 - 79, 2014
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Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
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Subject
- SENSITIVE TRACE-METALS; NORTHERN CONGO FAN; AUTHIGENIC CARBONATES; MARINE-SEDIMENTS; ORGANIC-CARBON; PORE-WATER; JAPAN SEA; CHINA SEA; SEEP ENVIRONMENTS; CONTINENTAL-SHELF
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Keywords
- East Sea; South Korea Plateau; Rare earth elements; Redox; Extractable fraction; High-Mg calcite
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Type
- Article
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Language
- English
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Document Type
- Article
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