Late Pleistocene dark laminated mud layers from the Korea Plateau, western East Sea/Japan Sea, and their paleoceanographic implications SCIE SCOPUS

Cited 30 time in WEB OF SCIENCE Cited 29 time in Scopus
Title
Late Pleistocene dark laminated mud layers from the Korea Plateau, western East Sea/Japan Sea, and their paleoceanographic implications
Author(s)
Khim, B. K.; Bahk, J. J.; Hyun, S.; Lee, G. H.
KIOST Author(s)
Hyun, Sangmin(현상민)
Publication Year
2007-04-20
Abstract
A variety of approaches were applied to a 11.1-m-long sediment core (EBP-4) from the Korea Plateau, one of the bathymetric highs in the western part of the East Sea/Japan Sea, to understand late Pleistocene paleoenvironmental change. The chronostratigraphy of the core was established using a radiocarbon age, dark laminated mud (DLM) layers with known ages, the oxygen isotope (delta O-18) curve of planktonic foraminifera, biogenic opal and total organic carbon (TOC) contents, downcore changes in the carbon/nitrogen (C/N) ratio as well as their isotopic ratio (delta C-13 and delta N-15) in organic matter. Although interrupted by several pumice lapilli layers, the core bottom represents marine isotope stage (MIS) 8, and spans more than 250 kyr of paleoceanographic history of the western East Sea/Japan Sea. Paleoenvironmental conditions during MIS 2 and MIS 6 are clearly distinguishable, represented by the negative shift of delta O-18 values of planktonic foraminifera, resulting from surface-water freshening due to basin isolation caused by eustatic sea-level lowering. The corresponding dark laminated mud (DLM I, IIa, IIb and III) layers formed during glacial maxima are characterized by strong Mo and total sulfur (TS) enrichment in anoxic conditions, which indicates a stagnant and strongly-stratified water-column structure. Biogenic opal contents can be a useful indicator to confirm the chronostratigraphic assessment, and can also identify periods of high surface-water productivity in the East Sea/Japan Sea particularly during interglacial times. In contrast, glacial paleoproductivity might be low, compared to the interglacial because of insufficient nutrient availability, resulting from limited vertical ventilation. The delta C-13 and delta N-15 values of sedimentary organic matter also emphasize increased terrestrial input during the glacial maxima, exhibiting highly depleted delta C-13 and delta N-15 values in all DLM layers. Sea-level induced paleoenvironmental changes associated with glacial-interglacial variations are identified from the Korea Plateau, confirming these events Occurred throughout the whole East Sea/Japan Sea. (C) 2007 Elsevier B.V. All rights reserved.
ISSN
0031-0182
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4706
DOI
10.1016/j.palaeo.2006.11.029
Bibliographic Citation
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, v.247, no.1-2, pp.74 - 87, 2007
Publisher
ELSEVIER SCIENCE BV
Subject
LAST GLACIAL MAXIMUM; SEDIMENTARY ORGANIC-MATTER; YOUNGER DRYAS EVENT; ULLEUNG BASIN; ISOTOPIC COMPOSITIONS; MARINE-SEDIMENTS; 36 KYR; NITROGEN; CARBON; OCEAN
Keywords
laminated mud; paleoceanography; paleoclimate; stable isotope; anoxic condition; Late Pleistocene; East Sea/Japan Sea
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Marine environmentology,Marine environmentology,Organic chemistry,해양환경학,화학해양학,유기화학

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