Paleomagnetic studies of the Archean rocks collected from the Napier Complex in Enderby Land,East Antarctica
A total of 10 Archean rocks, collected from the Napier Complex in Enderby Land, Antarctica, were studied paleomagnetically. Natural remanent magnetization (NRM) of 5 specimens is stable supported by AF and thermal demagnetization of NRM, magnetic hysteresis and AF demagnetization of SIRM and ARM pro...
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National Institute of Polar Research
1988
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ftdoajarticles:oai:doaj.org/article:289aa3b4019b4d2ab20fdc02c4327f0f 2023-05-15T14:01:51+02:00 Paleomagnetic studies of the Archean rocks collected from the Napier Complex in Enderby Land,East Antarctica Minoru Funaki 1988-03-01T00:00:00Z https://doi.org/10.15094/00008572 https://doaj.org/article/289aa3b4019b4d2ab20fdc02c4327f0f EN JA eng jpn National Institute of Polar Research https://doi.org/10.15094/00008572 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008572 0085-7289 2432-079X https://doaj.org/article/289aa3b4019b4d2ab20fdc02c4327f0f Antarctic Record, Vol 32, Iss 1, Pp 1-16 (1988) Geography (General) G1-922 article 1988 ftdoajarticles https://doi.org/10.15094/00008572 2022-12-31T14:39:39Z A total of 10 Archean rocks, collected from the Napier Complex in Enderby Land, Antarctica, were studied paleomagnetically. Natural remanent magnetization (NRM) of 5 specimens is stable supported by AF and thermal demagnetization of NRM, magnetic hysteresis and AF demagnetization of SIRM and ARM properties. The magnetic carriers in the specimens are estimated to be magnetite of single-/pseudosingle-domain structures associated with a small amount of pyrrhotite. However, other 5 specimens have only unstable NRM due to pseudosingle-/multi-domain structures. The VGP position, 75.0°S latitude and 14.5°E longitude, is calculated from the stable NRM component (-82.9°inclination, 39.3°declination and 8.2°α_<95> value) which is obtained from thermal demagnetization at 480℃. This NRM was acquired at the final metamorphism (2.45-2.5 b.a.) through a cooling stage from 580 to 480℃. The VGP position is very different from apparent polar wander paths around 2.5 b.a. of Piper's Pangaea, Australia and Africa. If the determination of NRM acquisition age is reliable, it suggests the continental rearrangements between the Pangaea of 2.5 b.a. and the early stage of Gondwanaland. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Enderby Land Directory of Open Access Journals: DOAJ Articles East Antarctica Napier ENVELOPE(-58.440,-58.440,-62.167,-62.167) |
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 studies of the Archean rocks collected from the Napier Complex in Enderby Land,East Antarctica |
topic_facet |
Geography (General) G1-922 |
description |
A total of 10 Archean rocks, collected from the Napier Complex in Enderby Land, Antarctica, were studied paleomagnetically. Natural remanent magnetization (NRM) of 5 specimens is stable supported by AF and thermal demagnetization of NRM, magnetic hysteresis and AF demagnetization of SIRM and ARM properties. The magnetic carriers in the specimens are estimated to be magnetite of single-/pseudosingle-domain structures associated with a small amount of pyrrhotite. However, other 5 specimens have only unstable NRM due to pseudosingle-/multi-domain structures. The VGP position, 75.0°S latitude and 14.5°E longitude, is calculated from the stable NRM component (-82.9°inclination, 39.3°declination and 8.2°α_<95> value) which is obtained from thermal demagnetization at 480℃. This NRM was acquired at the final metamorphism (2.45-2.5 b.a.) through a cooling stage from 580 to 480℃. The VGP position is very different from apparent polar wander paths around 2.5 b.a. of Piper's Pangaea, Australia and Africa. If the determination of NRM acquisition age is reliable, it suggests the continental rearrangements between the Pangaea of 2.5 b.a. and the early stage of Gondwanaland. |
format |
Article in Journal/Newspaper |
author |
Minoru Funaki |
author_facet |
Minoru Funaki |
author_sort |
Minoru Funaki |
title |
Paleomagnetic studies of the Archean rocks collected from the Napier Complex in Enderby Land,East Antarctica |
title_short |
Paleomagnetic studies of the Archean rocks collected from the Napier Complex in Enderby Land,East Antarctica |
title_full |
Paleomagnetic studies of the Archean rocks collected from the Napier Complex in Enderby Land,East Antarctica |
title_fullStr |
Paleomagnetic studies of the Archean rocks collected from the Napier Complex in Enderby Land,East Antarctica |
title_full_unstemmed |
Paleomagnetic studies of the Archean rocks collected from the Napier Complex in Enderby Land,East Antarctica |
title_sort |
paleomagnetic studies of the archean rocks collected from the napier complex in enderby land,east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1988 |
url |
https://doi.org/10.15094/00008572 https://doaj.org/article/289aa3b4019b4d2ab20fdc02c4327f0f |
long_lat |
ENVELOPE(-58.440,-58.440,-62.167,-62.167) |
geographic |
East Antarctica Napier |
geographic_facet |
East Antarctica Napier |
genre |
Antarc* Antarctica East Antarctica Enderby Land |
genre_facet |
Antarc* Antarctica East Antarctica Enderby Land |
op_source |
Antarctic Record, Vol 32, Iss 1, Pp 1-16 (1988) |
op_relation |
https://doi.org/10.15094/00008572 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008572 0085-7289 2432-079X https://doaj.org/article/289aa3b4019b4d2ab20fdc02c4327f0f |
op_doi |
https://doi.org/10.15094/00008572 |
_version_ |
1766271912090009600 |