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<p>To investigate fine-grained sediment sources, the geochemical compositions (Al, Cr, Ni, Cs, and REEs) and grain size were analyzed for 33 surface sediments collected from the Hupo Basin (HB) and Hupo Bank (HK), offshore of the eastern coast of Korea. Cluster analysis using geochemical elements indicated three groups: <i>Type I</i>, inner offshore region of the northwestern HB; <i>Type II</i>, from the inner offshore region of the southwestern HB to the eastern slope of the HK; and <i>Type III</i>, 14PH-B04, located on the eastern slope of the HK. Based on the UCC-normalized REEs patterns, especially for the Eu anomaly, the origin of the <i>Type I</i> (ΔEu = 0.85) was interpreted as sediments transported from small streams on the eastern coast of Korea, such as Namdae-cheon (ΔEu = 0.84). Furthermore, the <i>Type II</i> was divided into two subgroups: <i>Type IIa</i> (ΔEu = 0.92) and <i>Type IIb (</i>ΔEu = 0.99). In the Korea Strait Shelf Mud (KSSM) a mixture of sediments from the Nakdong River and Chinese rivers had a ΔEu of 1.15, <i>Type IIa</i> and <i>Type IIb</i> could be interpreted as a mixture of a proximal deposit and a long-range transported deposit (KSSM). <i>Type III</i> is suggested to have the same origin as <i>Type IIa</i> but be diluted by shell. A comprehensive interpretation of the UCC-normalized REEs patterns and movement of suspended solids on the satellite images suggested that most of the proximal deposits were supplied during the typhoon season, and deposits related to KSSM materials were considered to be transported by the East Korea Warm Current during the rainy season.</p>

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Fine-grained surface sediment provenance in the Hupo Basin, Eastern Coast of Korea

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • In Kwon Um,
  • Man Sik Choi,
  • Jang-Jun Bahk,
  • Soo Yeon Han

摘要

To investigate fine-grained sediment sources, the geochemical compositions (Al, Cr, Ni, Cs, and REEs) and grain size were analyzed for 33 surface sediments collected from the Hupo Basin (HB) and Hupo Bank (HK), offshore of the eastern coast of Korea. Cluster analysis using geochemical elements indicated three groups: Type I, inner offshore region of the northwestern HB; Type II, from the inner offshore region of the southwestern HB to the eastern slope of the HK; and Type III, 14PH-B04, located on the eastern slope of the HK. Based on the UCC-normalized REEs patterns, especially for the Eu anomaly, the origin of the Type I (ΔEu = 0.85) was interpreted as sediments transported from small streams on the eastern coast of Korea, such as Namdae-cheon (ΔEu = 0.84). Furthermore, the Type II was divided into two subgroups: Type IIa (ΔEu = 0.92) and Type IIb (ΔEu = 0.99). In the Korea Strait Shelf Mud (KSSM) a mixture of sediments from the Nakdong River and Chinese rivers had a ΔEu of 1.15, Type IIa and Type IIb could be interpreted as a mixture of a proximal deposit and a long-range transported deposit (KSSM). Type III is suggested to have the same origin as Type IIa but be diluted by shell. A comprehensive interpretation of the UCC-normalized REEs patterns and movement of suspended solids on the satellite images suggested that most of the proximal deposits were supplied during the typhoon season, and deposits related to KSSM materials were considered to be transported by the East Korea Warm Current during the rainy season.