Stratigraphy of a sediment core collected from the ne equatorial pacific using reversal patterns of geomagnetic field and be isotope ratio SCOPUS KCI

Title
Stratigraphy of a sediment core collected from the ne equatorial pacific using reversal patterns of geomagnetic field and be isotope ratio
Author(s)
Kim, W.; Hyeong, K.; Kong, G.S.
KIOST Author(s)
Kim, Won Nyon(김원년)Hyeong, Ki Seong(형기성)
Publication Year
2014
Abstract
A 570 cm-long sediment core was retrieved at 9o57'N and 131o42'W in 5,080 m water depth from the northeast equatorial Pacific and its stratigraphy was established with10Be/9Be and paleomagnetic measurements. Successive AF demagnetization reveals eight geomagnetic field reversals. In the reference geologic time scale, the eight reversal events correspond to an age of about 4.5 Ma. However,10Be/9Be-based age yields 9.5 Ma at a depth of 372 cm. Such a large discrepancy in determined ages is attributed to an extremely low sedimentation rate, 0.4 mm/kyr on average, of the study core and resultant loss or smoothing of geomagnetic fields. The composite age model reveals a wide range in the sedimentation rate - varying from 0.1 to 2.4 mm/kyr. However, the sedimentation rate shows systematic variation depending on sedimentary facies (Unit II and III), which suggests that each lithologic unit has a unique provenance and transport mechanism. At depths of 110-80 cm with a sedimentation rate of about 0.1 mm/kyr, ancient geomagnetic field reversal events of at least a 1.8 Myr time span have not been recorded, which indicates the probable existence of a hiatus in the interval. Such a sedimentary hiatus is observed widely in the deep-sea sediments of the NE equatorial Pacific. © 2014, Korea Ocean Research and Development Institute. All rights reserved.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2943
DOI
10.4217/OPR.2014.36.4.395
Bibliographic Citation
Ocean and Polar Research, v.36, no.4, pp.395 - 405, 2014
Publisher
Korea Ocean Research and Development Institute
Subject
beryllium isotope; deep-sea sediment; demagnetization; facies; geomagnetic field; isotopic ratio; lithology; paleomagnetism; sediment core; sedimentation rate; stratigraphy; Pacific Ocean; Pacific Ocean (Equatorial)
Keywords
Age model; Be isotope; Deep-sea sediments; Northeast equatorial Pacific; Paleomagnetism
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
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