Paleomagnetic investigation of the Beacon Group in the McMurdo Sound region, Antarctica
A total of 216 paleomagnetic samples of the Beacon Group (sandstone) were collected from Mt. Circe, Mt. Knobhead, Allan Hills and Mt. Fleming. The respective sedimentary sequences are Pre- or Early-Devonian, Devonian, Permo-Triassic and Triassic. The representative samples were tested for NRM stabil...
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National Institute of Polar Research
1983
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fttriple:oai:gotriple.eu:oai:doaj.org/article:2b6f9d4a02394217ae766197ef721b9d 2023-05-15T13:52:50+02:00 Paleomagnetic investigation of the Beacon Group in the McMurdo Sound region, Antarctica Minoru Funaki 1983-03-01 https://doi.org/10.15094/00008349 https://doaj.org/article/2b6f9d4a02394217ae766197ef721b9d en other eng National Institute of Polar Research doi:10.15094/00008349 0085-7289 2432-079X https://doaj.org/article/2b6f9d4a02394217ae766197ef721b9d undefined Antarctic Record, Iss 78, Pp 1-14 (1983) geo art Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 1983 fttriple https://doi.org/10.15094/00008349 2023-01-22T18:11:43Z A total of 216 paleomagnetic samples of the Beacon Group (sandstone) were collected from Mt. Circe, Mt. Knobhead, Allan Hills and Mt. Fleming. The respective sedimentary sequences are Pre- or Early-Devonian, Devonian, Permo-Triassic and Triassic. The representative samples were tested for NRM stability against AF and thermal demagnetization, ARM and TRM acquisition, and AF demagnetization of ARM. The following results were obtained. The samples from Mt. Circe and Mt. Knobhead have stable NRM of parallel direction to that of the Ferrar dolerite. From this we conclude that these samples were remagnetized in the Jurassic Age and the primary magnetization disappeared. The samples from Mt. Fleming were also remagnetized by the dyke of the Ferrar dolerite or do not have stable NRM. However, parts of the samples from the Allan Hills have stable depositional remanent magnetization (DRM) of the Permo-Triassic Age. The direction of NRM for these samples is parallel to that of the Ferrar dolerite in the Jurassic Age. This suggests that East Antarctica had no shift of VGP. This conclusion is consistent with the results on the Mesozoic Age in Australia. Thus Australia must have been linked to Antarctica at least up to the Jurassic Age. Article in Journal/Newspaper Antarc* Antarctica East Antarctica McMurdo Sound Unknown Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) Circe ENVELOPE(125.000,125.000,-75.000,-75.000) East Antarctica Knobhead ENVELOPE(161.533,161.533,-77.917,-77.917) McMurdo Sound |
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English |
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geo art |
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geo art Minoru Funaki Paleomagnetic investigation of the Beacon Group in the McMurdo Sound region, Antarctica |
topic_facet |
geo art |
description |
A total of 216 paleomagnetic samples of the Beacon Group (sandstone) were collected from Mt. Circe, Mt. Knobhead, Allan Hills and Mt. Fleming. The respective sedimentary sequences are Pre- or Early-Devonian, Devonian, Permo-Triassic and Triassic. The representative samples were tested for NRM stability against AF and thermal demagnetization, ARM and TRM acquisition, and AF demagnetization of ARM. The following results were obtained. The samples from Mt. Circe and Mt. Knobhead have stable NRM of parallel direction to that of the Ferrar dolerite. From this we conclude that these samples were remagnetized in the Jurassic Age and the primary magnetization disappeared. The samples from Mt. Fleming were also remagnetized by the dyke of the Ferrar dolerite or do not have stable NRM. However, parts of the samples from the Allan Hills have stable depositional remanent magnetization (DRM) of the Permo-Triassic Age. The direction of NRM for these samples is parallel to that of the Ferrar dolerite in the Jurassic Age. This suggests that East Antarctica had no shift of VGP. This conclusion is consistent with the results on the Mesozoic Age in Australia. Thus Australia must have been linked to Antarctica at least up to the Jurassic Age. |
format |
Article in Journal/Newspaper |
author |
Minoru Funaki |
author_facet |
Minoru Funaki |
author_sort |
Minoru Funaki |
title |
Paleomagnetic investigation of the Beacon Group in the McMurdo Sound region, Antarctica |
title_short |
Paleomagnetic investigation of the Beacon Group in the McMurdo Sound region, Antarctica |
title_full |
Paleomagnetic investigation of the Beacon Group in the McMurdo Sound region, Antarctica |
title_fullStr |
Paleomagnetic investigation of the Beacon Group in the McMurdo Sound region, Antarctica |
title_full_unstemmed |
Paleomagnetic investigation of the Beacon Group in the McMurdo Sound region, Antarctica |
title_sort |
paleomagnetic investigation of the beacon group in the mcmurdo sound region, antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1983 |
url |
https://doi.org/10.15094/00008349 https://doaj.org/article/2b6f9d4a02394217ae766197ef721b9d |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) ENVELOPE(125.000,125.000,-75.000,-75.000) ENVELOPE(161.533,161.533,-77.917,-77.917) |
geographic |
Allan Hills Circe East Antarctica Knobhead McMurdo Sound |
geographic_facet |
Allan Hills Circe East Antarctica Knobhead McMurdo Sound |
genre |
Antarc* Antarctica East Antarctica McMurdo Sound |
genre_facet |
Antarc* Antarctica East Antarctica McMurdo Sound |
op_source |
Antarctic Record, Iss 78, Pp 1-14 (1983) |
op_relation |
doi:10.15094/00008349 0085-7289 2432-079X https://doaj.org/article/2b6f9d4a02394217ae766197ef721b9d |
op_rights |
undefined |
op_doi |
https://doi.org/10.15094/00008349 |
_version_ |
1766257589611397120 |