Rock Magnetic Approaches Used on Deep-sea Sediments in the Northeastern Equatorial Pacific SCIE SCOPUS KCI

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Title
Rock Magnetic Approaches Used on Deep-sea Sediments in the Northeastern Equatorial Pacific
Author(s)
Park, Cheong Kee; Lee, Gun Chang
KIOST Author(s)
Park, Cheong Kee(박정기)Lee, Gun Chang(이근창)
Publication Year
2018-06
Abstract
Rock magnetic properties of unconsolidated sediments from the Korea Deep Ocean Study area of the northeastern equatorial Pacific were analyzed to trace the time-dependent variations of sedimentary environments. For upper Pleistocene sediments, light-brown sediments predominate, whereas the lower sediments deposited in the late Pliocene are dark brown. Rock magnetic properties also clearly differ among the two distinct color environments. Values of anhysteretic remanent magnetization and low-field magnetic susceptibility are highly responsive to changes in the color of the sediment. For example, comparatively low values denote a dominance of coarse-grained magnetic minerals as observed in the lower dark-brown layers. With respect to the content of magnetic minerals, coarse magnetic grains are highly concentrated in the darker-colored sediment layers. However, both the magnetic mineral dependent parameter (S ratio) and results of the scanning electron microscope observation indicate that magnetic mineral changes did not occur along the core depth, which means that there was no apparent source change. Without distinctive source changes, the variations in the rock magnetic properties likely reflect a process by which the magnetic grains were primarily transported by enhanced wind and bottom currents and affected by diagenetic dissolution as a function of both the time from burial and the extremely low sedimentation rates after deposition.
ISSN
1738-5261
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/888
DOI
10.1007/s12601-018-0024-0
Bibliographic Citation
OCEAN SCIENCE JOURNAL, v.53, no.2, pp.369 - 380, 2018
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
Subject
NORTH PACIFIC; REMANENT MAGNETIZATION; KODOS AREA; ENVIRONMENTAL MAGNETISM; PLEISTOCENE SEDIMENTS; PELAGIC SEDIMENTS; OCEAN; DISSOLUTION; CORE
Keywords
rock magnetic properties; paleoenvironment; polymetallic nodules; northeastern equatorial Pacific; KODOS area
Type
Article
Language
English
Document Type
Article
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
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