Econ. Environ. Geol. 2002; 35(2): 171-177

Published online April 30, 2002

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Stratigraphical and Sedimentological Studies on Core Sediments from the Southwestern Ulleung Basin, East Sea

Myong-Ho Park1, Byong-Jae Ryu2, Il-Soo Kim1*, Taejin Cheong2, Youngjoo Lee2 and Kang-Min Yu1

1Department of Earth System Sciences, Yonsei University, Shinchon-dong 134, Seodaemun-gu, Seoul 120-749, Korea
2Petroleum Marine Resources Research Division, Korea Institute of Geoscience and Marine Resources, Gajeong-dong 30, Yusong-gu, Daejeon 305-350, Korea

Correspondence to :

Il-Soo Kim

ilsoo_kim@lycos.co.kr

Received: November 1, 2001; Accepted: April 26, 2002

Abstract

Two piston-core sediments, obtained from the southwestern margin of the Ulleung Basin in East Sea, are analyzed to investigate the stratigraphy and sedimentary environment of the Late Quaternary. The cores consist mainly of muddy sediments with silty sands, lapilli tephra and ash layers. The chronostratigraphic correlation with known eruption ages reveals that the core sediments contain the stratigraphic document over the past 46.1 kyr and the sedimentation rates during the last glacial period were relatively higher (12.1~14.9 cm/kyr) than those in pelagic ocean. Several sedimentary facies, mainly affected by turbidity currents, are commonly present in the core interval accumulated during the oxygen-isotope stage 2. Many of horizontal voids, which are thought to have formed by gas
expansion, are observed in core 00GHP-07. The total organic carbon (TOC) contents of the core sediments are noticeably high (average 1.8%). Particularly, these TOC values increased during Termination I, suggesting that during this time interval the sedimentary environment of the study area was changed to more anoxic.

Keywords Late quaternary, sedimentary environment, muddy sediments, tephra layer, total organic carbon, Ulleung Basin

Article

Econ. Environ. Geol. 2002; 35(2): 171-177

Published online April 30, 2002

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Stratigraphical and Sedimentological Studies on Core Sediments from the Southwestern Ulleung Basin, East Sea

Myong-Ho Park1, Byong-Jae Ryu2, Il-Soo Kim1*, Taejin Cheong2, Youngjoo Lee2 and Kang-Min Yu1

1Department of Earth System Sciences, Yonsei University, Shinchon-dong 134, Seodaemun-gu, Seoul 120-749, Korea
2Petroleum Marine Resources Research Division, Korea Institute of Geoscience and Marine Resources, Gajeong-dong 30, Yusong-gu, Daejeon 305-350, Korea

Correspondence to:

Il-Soo Kim

ilsoo_kim@lycos.co.kr

Received: November 1, 2001; Accepted: April 26, 2002

Abstract

Two piston-core sediments, obtained from the southwestern margin of the Ulleung Basin in East Sea, are analyzed to investigate the stratigraphy and sedimentary environment of the Late Quaternary. The cores consist mainly of muddy sediments with silty sands, lapilli tephra and ash layers. The chronostratigraphic correlation with known eruption ages reveals that the core sediments contain the stratigraphic document over the past 46.1 kyr and the sedimentation rates during the last glacial period were relatively higher (12.1~14.9 cm/kyr) than those in pelagic ocean. Several sedimentary facies, mainly affected by turbidity currents, are commonly present in the core interval accumulated during the oxygen-isotope stage 2. Many of horizontal voids, which are thought to have formed by gas
expansion, are observed in core 00GHP-07. The total organic carbon (TOC) contents of the core sediments are noticeably high (average 1.8%). Particularly, these TOC values increased during Termination I, suggesting that during this time interval the sedimentary environment of the study area was changed to more anoxic.

Keywords Late quaternary, sedimentary environment, muddy sediments, tephra layer, total organic carbon, Ulleung Basin

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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