HR: 1330h
AN: OS52B-0919 [PDF]
TI: A Study on Geotechnical Properties of Deep-sea Sediments,
NE Equatorial Pacific of KODOS Area
AU: * Chi, S
EM: sbchi@kordi.re.kr
AF: Korea Ocean Research & Development Institute, Ansan P.O.Box 29, Ansan, 425-600
Korea, Republic of
AU: Kim, K
EM: kkim@kordi.re.kr
AF: Korea Ocean Research & Development Institute, Ansan P.O.Box 29, Ansan, 425-600
Korea, Republic of
AU: Park, C
EM: ckpark@kordi.re.kr
AF: Korea Ocean Research & Development Institute, Ansan P.O.Box 29, Ansan, 425-600
Korea, Republic of
AU: Kim, H
EM: hskim@kordi.re.kr
AF: Korea Ocean Research & Development Institute, Ansan P.O.Box 29, Ansan, 425-600
Korea, Republic of
AB:
Deep-sea surface sediment were analyzed for their geotechnical properties, and the sediment samples were collected with a
multiple-corer from 31 stations along the track line(131’30€W, 5-12’N) in the northeast equatorial Pacific. Most of the
sediments from the northern part(8-12’N) showed typical properties of siliceous sediments, whereas the southern part(5-6’N)
showed calcareous characteristics due to high biogenic carbonate productivity in the surface waters, where its water depth
was shallower than the carbonate compensation depth (CCD: 4,400 m). Geotechnical properties changed sharply at the boundary
of 7’N. Calcareous sediments from the southern part had low water contents, low porosity, low shear strength, high bulk
density and high specific grain density, whereas siliceous sediments from the northern part attained high water content, high
porosity, high shear strength, low bulk density and low specific grain density. Higher sediment activities were observed in
the northern sediment samples than the southern sediment samples. The core samples of the northern sediments were divided
into a semi-liquid upper layer and a consolidated lower layer with a boundary at 5-8 cm. These sediment samples showed a
rapid increasing pattern along the downcore in original shear strength when an opposite trend was observed in the southern
samples. The results showed that sediment variabilities in geotechnical properties between the northern and southern parts
such as productivities of surface water, grain solubility due to water depth variation, sedimentation rate, erosion and
redistribution of sediment, and combined sedimentary processes were distinctly different along the latitude.
DE: 3000 MARINE GEOLOGY AND GEOPHYSICS
DE: 3022 Marine sediments--processes and transport
DE: 4558 Sediment transport
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting