Holocene environmental changes of the Hwajinpo Lagoon on the eastern coast of Korea |
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| Authors: | Jong-Gwon Yum Keiji Takemura Takao Tokuoka Kang-Min Yu |
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| Institution: | (1) Department of Earth System Sciences, College of Sciences, Yonsei University, 134, Shinchon-dong, Sodaemun-ku, Seoul, 120 749, Korea;(2) Beppu Geothermal Research Laboratory, Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Beppu, 874-0903, Japan;(3) Department of Geoscience, Faculty of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue, Shimane, 690-8504, Japan |
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| Abstract: | Lithologic and geochemical data of a core from the Hwajinpo Lagoon, located on the eastern coast of Korea, provided the evolutionary history of the lagoon related to Holocene sea-level changes of the East Sea (Sea of Japan). Grain size analysis, water content analysis, and soft X-ray analysis of core samples were used to reconstruct sedimentary environments, as were total organic carbon, C/N, S and C/S chemical records. Assemblages of mollusc and diatom remains also provided paleoenvironmental information. The reconstruction of paleoenvironments from these multi-proxy data allows the establishment of an evolutionary model of the Hwajinpo Lagoon. The environmental changes of the Hwajinpo Lagoon can be divided into seven different depositional facies: (l) Exposed basement rock; (2) Estuarine; (3) Stagnant brackish lagoon (isolated); (4) Oxic condition lagoon (organic activity); (5) Fresh water lake; (6) Oxic brackish lagoon (recent condition); (7) Prograding river delta. These environmental changes can be related to sea-level change during the Holocene. The trends of sea-level change in the Hwajinpo Lagoon from this study can be compared to those of the Japanese coastal areas located on the other side of the East Sea such as Lakes Shinji and Nakaumi. |
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| Keywords: | Core sediments East Sea (Sea of Japan) Environmental change Holocene Hwajinpo Lagoon Sea-level change |
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