Wavelet-based verification of a relative paleointensity record from the North Pacific SCIE SCOPUS

Cited 1 time in WEB OF SCIENCE Cited 2 time in Scopus
Title
Wavelet-based verification of a relative paleointensity record from the North Pacific
Author(s)
Shin, Ji Young; Yu, Yongjae; Kim, Wonnyon
KIOST Author(s)
Kim, Wonnyon(김원년)
Publication Year
2019-08-15
Abstract
We present a relative paleointensity (RPI) record for the last similar to 1.1 Myr estimated from a sediment core in the central North Pacific, with quality verification using wavelet analysis. Rock magnetic analysis reveals that a stable remanence is carried mainly by single-domain (SD) biogenic magnetite and pseudo-SD detrital magnetite and that concentration- and grain-size-related bulk magnetic parameters vary by a factor of 3, initially meeting a conventional standard for RPI estimation. However, a further test using wavelet spectra of RPI proxies normalized by anhysteretic remanent magnetization (ARM) or isothermal remanent magnetization (IRM) shows intermittent orbital contamination at period of 100 kyr. A part of the 100-kyr orbital frequency in ARM-normalized RPI has a coherence and physical relationship with the normalizer. For the same time interval, a prominent 100-kyr cycle in the ARM/IRM wavelet spectra is also coherent with RPI, indicating that relative changes in biogenic and detrital magnetite were not well compensated by ARM normalization. For the selected RPI proxy using IRM normalization, a significant physical relationship with the lithology of magnetic minerals was not detected in the wavelet analysis, and thus, its intermittent orbital cycles could be of climatic origin, probably induced by non-magnetic factors. Nevertheless, our RPI record is consistent with global RPI stacks and provides a successful reconstruction of paleointensity with geomagnetic field origin in the North Pacific.
ISSN
1880-5981
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/546
DOI
10.1186/s40623-019-1067-x
Bibliographic Citation
EARTH PLANETS AND SPACE, v.71, no.1, 2019
Publisher
SPRINGEROPEN
Subject
GEOMAGNETIC-FIELD; REVERSAL; BRUNHES; EXCURSIONS; INTENSITY; SEDIMENTS; MA; ATLANTIC; CHRON; BASIN
Keywords
Paleomagnetism; Relative paleointensity; North Pacific; Wavelet analysis; Orbital cycles
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGEROPEN
Related Researcher
Research Interests

Paleomagnetism,Environmental Science,Geology,고지자기,환경과학,지질학

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