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Holocene Evolution of the Outer Lake of Hwajinpo Lagoon On the Eastern Coast of Korea; Environmental Changes with Holocene Sea-Level Fluctuation of the East Sea (Sea of Japan)

Published online by Cambridge University Press:  18 July 2016

Jong-Gwon Yum ,
Kang-Min Yu ,
Keiji Takemura ,
Toshiro Naruse ,
Akihisa Kitamura ,
Hiroyuki Kitagawa  and
Jong-Chan Kim
Jong-Gwon Yum*
Affiliation:
AMS Laboratory, National Center for Inter-University Facilities, Seoul National University, Seoul, 151-742, Korea
Kang-Min Yu
Affiliation:
Department of Earth System Sciences, College of Sciences, Yonsei University, Seoul, 120-749, Korea
Keiji Takemura
Affiliation:
Beppu Geothermal Research Laboratory, Institute for Geothermal Science, Graduate School of Science, Kyoto University, Beppu, 874-0903, Japan
Toshiro Naruse
Affiliation:
Department of Geography, Hyogo University of Teacher Education, Hyogo, 673-1494, Japan
Akihisa Kitamura
Affiliation:
Institute of Geosciences, Faculty of Science, Shizuoka University, Shizuoka 422-8529, Japan
Hiroyuki Kitagawa
Affiliation:
Institute for Hydrospheric-Atmospheric Science, Nagoya University, Nagoya 464-8601, Japan
Jong-Chan Kim
Affiliation:
AMS Laboratory, National Center for Inter-University Facilities, Seoul National University, Seoul, 151-742, Korea
*
Corresponding author. Email: yums@ieg.or.kr.
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Abstract

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The evolution of the outer lake of Hwajinpo Lagoon in Korea has been reconstructed using environmental proxies (lithologic, geochemical, and fossil data) with a chronology established using 7 accelerator mass spectrometry (AMS) radiocarbon dates. Grain size, water content, and X-ray analyses from the core of outer coastal lakes (HJ99) were used to reconstruct sedimentary environments by using total organic carbon, C/N, S, and C/S chemical proxies. Assemblages of mollusc remains also provided paleoenvironmental information. The environmental changes of the outer lake of Hwajinpo Lagoon can be divided into 6 depositional phases. The basin of the Hwajinpo was exposed and underwent a weathering process before the Holocene period. The muddy sand layer on the weathered bedrock indicated an estuarine system about 6000 BP. The laminated layer implies that the lagoonal system was anoxic between about 5500–2800 BP. The marl layer implies a relatively oxic lagoonal condition with mollusc presence about 2500 B P. The layer of very low sulfur content indicates a freshwater lake system isolated by a sand barrier about 1700 BP. Beginning about 1000 B P, the river system deposits progress progradation on the marl layer. Two erosional landforms could be related with a high standing sea level span during Holocene. These high-stands are dated at 5700 BP and 2200 BP and are supposed to have formed erosional landforms of about 1.6 amsl and 0.8 amsl, respectively. Environmental changes of the outer lake of Hwajinpo Lagoon are considered due mainly to the lake- and sea-level fluctuation during Holocene.

Type
Part II
Information
Radiocarbon , Volume 46 , Issue 2: Proceedings of the 18th International Radiocarbon Conference (Part 2 of 2), Conference Editors: Nancy Beavan Athfield, Rodger J Sparks , 2004 , pp. 797 - 808
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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