A buried palaeosol and late Pleistocene unconformity in coastal deposits of the eastern Yellow Sea, East Asia
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Title
- A buried palaeosol and late Pleistocene unconformity in coastal deposits of the eastern Yellow Sea, East Asia
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Author(s)
- Lim, DI; Jung, HS; Kim, BO; Choi, JY; Kim, HN
- KIOST Author(s)
- Lim, Dhong Il(임동일); Jung, Hoi Soo(정회수)
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Alternative Author(s)
- 임동일; 정회수
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Publication Year
- 2004
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Abstract
- Deep-drill core sampling with a high-resolution seismic survey was carried out to identify a Holocene-late Pleistocene boundary in the eastern coast of the Yellow Sea, East Asia. Analysis of core sections revealed the existence of an oxidized and desiccated sedimentary layer, lying directly below a Holocene horizon (Unit 1) and being developed at the top of a late Pleistocene (Unit 11), possibly last interglacial tidal deposit. The buried oxidized-sedimentary layer is characterized by semi-consolidated, yellowish sediments showing signs of desiccation and alteration such as periglacial cryogenic structures, lithified trace fossils, depletion of smectite, and high geochemical weathering index (Ba/Sr ratio). These features, together with radiocarbon ages, suggests that the layer, defined as a palacosol developed in marine sediments, has formed as a result of prolonged subaerial exposure of Unit II sediments during the Wisconsinan sea-level lowstand, producing a regional unconformity (late Pleistocene unconformity). This unconformable bounding surface corresponds to a prominent near-surface reflector (R), which is observed in seismic profiles obtained across the drilled-core sections and further is traced ubiquitously across the Yellow Sea shelf. Consequently, the buried palaeosol layer associated with the seismic reflector presents a key horizon for the understanding of late Quaternary environmental changes and integrated stratigraphical correlation in the East Asian marginal seas. (C) 2004 Elsevier Ltd and INQUA. All rights reserved.
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ISSN
- 1040-6182
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/5361
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DOI
- 10.1016/j.quaint.2004.01.027
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Bibliographic Citation
- QUATERNARY INTERNATIONAL, v.121, pp.109 - 118, 2004
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Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
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Type
- Article
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Language
- English
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Document Type
- Article
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