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- Title
Distribution characteristic of physical property and texture of surface sediments in the East Sea, Korea.
- Authors
Lee, Gwang-Soo; Kim, Sora; Um, In-Kwon
- Abstract
To understand sedimentary environment and distribution characteristic of sediments in theEast Sea, Korea, total 410 cores were obtained in this area and analyzed for sediment textureand physical property. From these analysis data, we made distribution maps of physicalproperty and texture of surface sediments in the East Sea. The sediment texture data showthat the continental shelf in the southern part of the East Sea is distributed with fine-grainedrecent sediments deposited at present sea-level. The Ulleung Basin is mainly composedof hemipelagic sediments dominated by fine sediments. The middle continentalshelf in the western part of the East Sea is a mixture of fine sediments and coarserelict sediments, and the outer continental shelf consists of coarse relict sedimentsdeposited during the glacial period when sea-level is lower than present. In thewestern slope of the Ulleung Basin and some parts of the Korea Plateau, sandysediments and hemipelagic sediments are mixed due to slides/slumps and mass flowsediments. The physical properties of surface sediments shows similar pattern to thedistribution of sediment texture. The sound velocity and wet bulk density of thesediments were highest at the maximum of about 1,800 m/s and 2.16 g/cm3 in the outercontinental shelf of the East Sea and around the Ulleung Island. In the UlleungBasin, the sound velocity and the wet bulk density of the sediments are lowestat about 1,450 m/s and 1.2 g/cm3. The sound velocity of the sediment is about1,500 m/s and the wet bulk density is 1.7 g/cm3 in the continental shelf mud ofthe southwestern East Sea. This distribution characteristic of sediment texture andphysical property reflect well the sedimentary environment of the East Sea, Korea.
- Subjects
SOUTH Korea; SURFACE texture; SEDIMENTS; SPEED of sound; SURFACE properties
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article