Paleomagnetic Records and Mineral-Magnetic Properties of Deep-Sea Sediments in the NW Pacific: Paleoenvironmental Implication SCIE SCOPUS KCI

Cited 1 time in WEB OF SCIENCE Cited 1 time in Scopus
Title
Paleomagnetic Records and Mineral-Magnetic Properties of Deep-Sea Sediments in the NW Pacific: Paleoenvironmental Implication
Author(s)
Park, Cheong Kee; Kim, Wonnyon; Ko, Youngtak; Lee, Hyun-Bok; Moon, Jai-Woon; Doh, Seong-Jae
KIOST Author(s)
Kim, Wonnyon(김원년)Ko, Youngtak(고영탁)Moon, Jai Woon(문재운)
Publication Year
2012-12
Abstract
The paleomagnetic records and mineral-magnetic properties of unconsolidated core sediment from the east Mariana Basin of the western Pacific have been analyzed to trace the time-dependent variations in sedimentary environments. Progressive alternating field demagnetization effectively extracts a stable remanent magnetization showing both normal and reverse polarities. Comparison of successive polarity changes, recorded in the sediment core, with reference magnetic polarity time-scale, reveals that the recovered sediment column was deposited since the late Pliocene. From the sediment age model, calculated sedimentation rate during the late Pliocene was 9.8 times higher than that during the Pleistocene. Considering the oceanic environments and geologic setting in the study area, the anomalous high sediment flux during the late Pliocene was probably caused by enhanced current flows, such as North Equatorial Current, associated with atmospheric circulation as well as by debris flows from adjacent sea mounts. In addition, the systematic variation of mineral-magnetic properties indicates periodical fluxes of coarse and magnetically stable particles, on the fine-grained dominant sedimentary environments. Such influxes, however, would not be related to syn-volcanic activities, because the summits of seamounts were totally blanketed by biogenic Pliocene-Pleistocene sediments. It is, hence, reasonable to interpret that paleomagnetic and mineral-magnetic data probably reflect drastic paleoenvironmental changes at the boundary between the Pliocene and Pleistocene, where strong current and atmospheric circulations decreased.
ISSN
1738-5261
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3407
DOI
10.1007/s12601-012-0045-z
Bibliographic Citation
OCEAN SCIENCE JOURNAL, v.47, no.4, pp.497 - 508, 2012
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
Subject
EQUATORIAL PACIFIC; WESTERN PACIFIC; ENVIRONMENTAL MAGNETISM; REMANENT MAGNETIZATION; FERROMANGANESE CRUST; PARTICLE-SIZE; GRAIN-SIZE; KODOS AREA; OCEAN; TEMPERATURE
Keywords
Korea deep-sea research program; magnetostratigraphy; mineral-magnetic properties; paleoenvironment
Type
Article
Language
English
Document Type
Article
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
Related Researcher
Research Interests

Deep seabed exploration,Geochemistry,심해저자원탐사,지화학

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