Paleomagnetic investigation of Ferrar dolerite in the McMurdo Sound region, Antarctica
Paleomagnetic samples were collected from a sill and dykes of Ferrar dolerite of the Jurassic age in the Wright Valley, the Allan Hills, the Carapace Nunatak and Mt. Fleming of the McMurdo Sound region. The stability of the natural remanent magnetization (NRM) of these samples was tested against the...
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National Institute of Polar Research
1983
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ftdoajarticles:oai:doaj.org/article:51f574bcd4fa4d9da33c6448e6f7fda2 2023-05-15T13:54:07+02:00 Paleomagnetic investigation of Ferrar dolerite in the McMurdo Sound region, Antarctica Minoru Funaki 1983-01-01T00:00:00Z https://doi.org/10.15094/00008334 https://doaj.org/article/51f574bcd4fa4d9da33c6448e6f7fda2 EN JA eng jpn National Institute of Polar Research https://doi.org/10.15094/00008334 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008334 0085-7289 2432-079X https://doaj.org/article/51f574bcd4fa4d9da33c6448e6f7fda2 Antarctic Record, Iss 77, Pp 20-32 (1983) Geography (General) G1-922 article 1983 ftdoajarticles https://doi.org/10.15094/00008334 2022-12-31T15:38:43Z Paleomagnetic samples were collected from a sill and dykes of Ferrar dolerite of the Jurassic age in the Wright Valley, the Allan Hills, the Carapace Nunatak and Mt. Fleming of the McMurdo Sound region. The stability of the natural remanent magnetization (NRM) of these samples was tested against the alternating field (AF) and thermal demagnetization, and the hysteresis and thermomagnetic properties were also measured. The overall results show that the samples from the Wright Valley, the Allan Hills and Mt. Fleming have a reasonably stable NRM; the samples from the Carapace Nunatak were less stable. The NRM carriers are inferred to have a pseudosingle or multi domain structure for the samples from Carapace Nunatak and a single or pseudosingle domain structure for others. All these samples were magnetized to the normal polarity, and the calculated VGP positions were 45.3°S・152.0°W for the Wright Valley, 47.0°S・133.2°W for the Allan Hills and 68.6°S・139.5°W for Mt. Fleming. The virtual geomagnetic pole (VGP) positions obtained in this study are in reasonable agreement with other Jurassic VGPs from Antarctica. The mean VGP center obtained from three values in this study, excluding that of the Carapace Nunatak, and from seven values in the previous studies is located at 53.9°S of latitude and 141.8°W of longitude for Ferrar dolerite. Article in Journal/Newspaper Antarc* Antarctica Geomagnetic Pole McMurdo Sound Directory of Open Access Journals: DOAJ Articles McMurdo Sound Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) Wright Valley ENVELOPE(161.833,161.833,-77.517,-77.517) Carapace Nunatak ENVELOPE(159.450,159.450,-76.900,-76.900) |
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 Minoru Funaki Paleomagnetic investigation of Ferrar dolerite in the McMurdo Sound region, Antarctica |
topic_facet |
Geography (General) G1-922 |
description |
Paleomagnetic samples were collected from a sill and dykes of Ferrar dolerite of the Jurassic age in the Wright Valley, the Allan Hills, the Carapace Nunatak and Mt. Fleming of the McMurdo Sound region. The stability of the natural remanent magnetization (NRM) of these samples was tested against the alternating field (AF) and thermal demagnetization, and the hysteresis and thermomagnetic properties were also measured. The overall results show that the samples from the Wright Valley, the Allan Hills and Mt. Fleming have a reasonably stable NRM; the samples from the Carapace Nunatak were less stable. The NRM carriers are inferred to have a pseudosingle or multi domain structure for the samples from Carapace Nunatak and a single or pseudosingle domain structure for others. All these samples were magnetized to the normal polarity, and the calculated VGP positions were 45.3°S・152.0°W for the Wright Valley, 47.0°S・133.2°W for the Allan Hills and 68.6°S・139.5°W for Mt. Fleming. The virtual geomagnetic pole (VGP) positions obtained in this study are in reasonable agreement with other Jurassic VGPs from Antarctica. The mean VGP center obtained from three values in this study, excluding that of the Carapace Nunatak, and from seven values in the previous studies is located at 53.9°S of latitude and 141.8°W of longitude for Ferrar dolerite. |
format |
Article in Journal/Newspaper |
author |
Minoru Funaki |
author_facet |
Minoru Funaki |
author_sort |
Minoru Funaki |
title |
Paleomagnetic investigation of Ferrar dolerite in the McMurdo Sound region, Antarctica |
title_short |
Paleomagnetic investigation of Ferrar dolerite in the McMurdo Sound region, Antarctica |
title_full |
Paleomagnetic investigation of Ferrar dolerite in the McMurdo Sound region, Antarctica |
title_fullStr |
Paleomagnetic investigation of Ferrar dolerite in the McMurdo Sound region, Antarctica |
title_full_unstemmed |
Paleomagnetic investigation of Ferrar dolerite in the McMurdo Sound region, Antarctica |
title_sort |
paleomagnetic investigation of ferrar dolerite in the mcmurdo sound region, antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1983 |
url |
https://doi.org/10.15094/00008334 https://doaj.org/article/51f574bcd4fa4d9da33c6448e6f7fda2 |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) ENVELOPE(161.833,161.833,-77.517,-77.517) ENVELOPE(159.450,159.450,-76.900,-76.900) |
geographic |
McMurdo Sound Allan Hills Wright Valley Carapace Nunatak |
geographic_facet |
McMurdo Sound Allan Hills Wright Valley Carapace Nunatak |
genre |
Antarc* Antarctica Geomagnetic Pole McMurdo Sound |
genre_facet |
Antarc* Antarctica Geomagnetic Pole McMurdo Sound |
op_source |
Antarctic Record, Iss 77, Pp 20-32 (1983) |
op_relation |
https://doi.org/10.15094/00008334 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008334 0085-7289 2432-079X https://doaj.org/article/51f574bcd4fa4d9da33c6448e6f7fda2 |
op_doi |
https://doi.org/10.15094/00008334 |
_version_ |
1766259768420204544 |