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https://doi.org/10.5194/os-2020-60
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2020-60
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 26 Jun 2020

Submitted as: research article | 26 Jun 2020

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This preprint is currently under review for the journal OS.

Changes in detrital sediment supply to the central Yellow Sea since the Last Glacial Maximum

Hyo Jin Koo and Hyen Goo Cho Hyo Jin Koo and Hyen Goo Cho
  • Department of Geology and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Republic of Korea

Abstract. The sediment supply to the central Yellow Sea since the Last Glacial Maximum was uncovered through clay mineralogy and geochemical analysis of core 11YS-PCL14 in the Central Yellow Sea mud (CYSM). The core can be divided into four units: Unit 4 (700–520 cm; 15.5–14.8 ka), Unit 3 (520–280 cm; 14.8–12.1 ka), Unit 2 (280–130 cm; 12.1–8.8 ka), and Unit 1 (130–0 cm; < 8.8 ka). Comparison of the clay mineral compositions, rare earth elements, and εNd values indicated distinct provenance shifts in core PCL14. Moreover, the integration of clay mineralogical and geochemical indices showed different origins according to particle size. The late last deglaciation (Units 3 and 4) sediments originated from all potential provenance rivers, while the source of coarse sediments changed to Huanghe in Unit 3. Early Holocene (Unit 2) sediments were characterized by oscillating grain size, clay minerals, and moderate εNd values. In this period, the dominant fine sediment provenance changed from the Huanghe to the Changjiang, whereas coarse sediments most likely originated from western Korean rivers. The Unit 1 CYSM sediments were sourced primarily from the Changjiang, along with minor contributions from the western Korean rivers. Possible transport mechanisms in the riverine sediment sources change and contributions to this include position shifts of river mouths, tidal stress evolution, and the development of the Yellow Sea Warm Current and coastal circulation systems.

Hyo Jin Koo and Hyen Goo Cho

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Hyo Jin Koo and Hyen Goo Cho

Hyo Jin Koo and Hyen Goo Cho

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Short summary
This article accounted for the change in sediment supply in the central Yellow Sea since the Last glacial maximum. Sediment sources were distinguished based on the integration of clay mineralogical and geochemical data such as trace elements and Sr/Nd isotopes. The core PCL14 was divided into four units and showed clear vertical variations according to sediment supply and sea-level change.
This article accounted for the change in sediment supply in the central Yellow Sea since the...
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