Characteristics of the natural remanent magnetization (NRM) of a core collected from offshore Wilkes Land, East Antarctica
Paleomagnetic and rockmagnetic studies were carried out in order to investigate the characteristics of natural remanent magnetization (NRM) of deep-sea sediments cored from offshore Wilkes Land, East Antarctica. The core is 540cm long. Alternating-field (AF) demagnetization experiments using a stepw...
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ftdoajarticles:oai:doaj.org/article:6fd9cd2af4774e3fbd612d1a5af94ae3 2023-05-15T13:48:44+02:00 Characteristics of the natural remanent magnetization (NRM) of a core collected from offshore Wilkes Land, East Antarctica Haruka Matsuoka Minoru Funaki 2003-11-01T00:00:00Z https://doi.org/10.15094/00009269 https://doaj.org/article/6fd9cd2af4774e3fbd612d1a5af94ae3 EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00009269 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00009269 0085-7289 2432-079X https://doaj.org/article/6fd9cd2af4774e3fbd612d1a5af94ae3 Antarctic Record, Vol 47, Iss 3, Pp 315-327 (2003) Geography (General) G1-922 article 2003 ftdoajarticles https://doi.org/10.15094/00009269 2022-12-31T02:55:45Z Paleomagnetic and rockmagnetic studies were carried out in order to investigate the characteristics of natural remanent magnetization (NRM) of deep-sea sediments cored from offshore Wilkes Land, East Antarctica. The core is 540cm long. Alternating-field (AF) demagnetization experiments using a stepwise AF field from5to100mTwereconductedonallofthesamples. TheNRMintensitiesare10-100 times higher than those commonly obtained from different localities. In the upper 460cm of the core, most samples had stable single component magnetization, and remarkable high-stability components which survived up to 100mT were observed. In the lower section of the core, in contrast, many samples showed more unstable (zigzag) demagnetization curves and secondary acquired magnetizations. The optimum AF demagnetization field intensity was assumed to be 30mT, because the secondary magnetizations of every sample seemed to be completely demagnetized at that AF field. The down core NRM variation after demagnetization by the optimum field revealed that the core contains 3 polarity intervals. By using smaller cubic samples of 1cc volume, the time resolution of the paleomagnetic record was much improved. Anhysteretic remanent magnetization (ARM) experiments were also conducted on all of the samples. The results of the AF demagnetization of ARM imply that the samples showing only soft NRM component possibly acquired their magnetization under a weak geomagnetic field. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Wilkes Land Directory of Open Access Journals: DOAJ Articles East Antarctica Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Haruka Matsuoka Minoru Funaki Characteristics of the natural remanent magnetization (NRM) of a core collected from offshore Wilkes Land, East Antarctica |
topic_facet |
Geography (General) G1-922 |
description |
Paleomagnetic and rockmagnetic studies were carried out in order to investigate the characteristics of natural remanent magnetization (NRM) of deep-sea sediments cored from offshore Wilkes Land, East Antarctica. The core is 540cm long. Alternating-field (AF) demagnetization experiments using a stepwise AF field from5to100mTwereconductedonallofthesamples. TheNRMintensitiesare10-100 times higher than those commonly obtained from different localities. In the upper 460cm of the core, most samples had stable single component magnetization, and remarkable high-stability components which survived up to 100mT were observed. In the lower section of the core, in contrast, many samples showed more unstable (zigzag) demagnetization curves and secondary acquired magnetizations. The optimum AF demagnetization field intensity was assumed to be 30mT, because the secondary magnetizations of every sample seemed to be completely demagnetized at that AF field. The down core NRM variation after demagnetization by the optimum field revealed that the core contains 3 polarity intervals. By using smaller cubic samples of 1cc volume, the time resolution of the paleomagnetic record was much improved. Anhysteretic remanent magnetization (ARM) experiments were also conducted on all of the samples. The results of the AF demagnetization of ARM imply that the samples showing only soft NRM component possibly acquired their magnetization under a weak geomagnetic field. |
format |
Article in Journal/Newspaper |
author |
Haruka Matsuoka Minoru Funaki |
author_facet |
Haruka Matsuoka Minoru Funaki |
author_sort |
Haruka Matsuoka |
title |
Characteristics of the natural remanent magnetization (NRM) of a core collected from offshore Wilkes Land, East Antarctica |
title_short |
Characteristics of the natural remanent magnetization (NRM) of a core collected from offshore Wilkes Land, East Antarctica |
title_full |
Characteristics of the natural remanent magnetization (NRM) of a core collected from offshore Wilkes Land, East Antarctica |
title_fullStr |
Characteristics of the natural remanent magnetization (NRM) of a core collected from offshore Wilkes Land, East Antarctica |
title_full_unstemmed |
Characteristics of the natural remanent magnetization (NRM) of a core collected from offshore Wilkes Land, East Antarctica |
title_sort |
characteristics of the natural remanent magnetization (nrm) of a core collected from offshore wilkes land, east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
2003 |
url |
https://doi.org/10.15094/00009269 https://doaj.org/article/6fd9cd2af4774e3fbd612d1a5af94ae3 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
East Antarctica Wilkes Land |
geographic_facet |
East Antarctica Wilkes Land |
genre |
Antarc* Antarctica East Antarctica Wilkes Land |
genre_facet |
Antarc* Antarctica East Antarctica Wilkes Land |
op_source |
Antarctic Record, Vol 47, Iss 3, Pp 315-327 (2003) |
op_relation |
http://doi.org/10.15094/00009269 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00009269 0085-7289 2432-079X https://doaj.org/article/6fd9cd2af4774e3fbd612d1a5af94ae3 |
op_doi |
https://doi.org/10.15094/00009269 |
_version_ |
1766249627342864384 |