Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East Antarctica
Natural remanent magnetizations (NRMs) of 5 dirt-ice layers including tephra collected from the Allan Hills in Southern Victoria Land, the Yamato Mountains and the Sφr Rondane Mountains in Eastern Queen Maud Land, East Antarctica, were investigated. The NRMs with 1.38 to 22.1×(10)^<-7>Am^2/kg...
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National Institute of Polar Research
1990
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ftdoajarticles:oai:doaj.org/article:388261e0680140b89321165f98641868 2023-05-15T13:37:57+02:00 Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East Antarctica Minoru Funaki 1990-07-01T00:00:00Z https://doi.org/10.15094/00008672 https://doaj.org/article/388261e0680140b89321165f98641868 EN JA eng jpn National Institute of Polar Research https://doi.org/10.15094/00008672 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008672 0085-7289 2432-079X https://doaj.org/article/388261e0680140b89321165f98641868 Antarctic Record, Vol 34, Iss 2, Pp 130-138 (1990) Geography (General) G1-922 article 1990 ftdoajarticles https://doi.org/10.15094/00008672 2022-12-31T06:15:03Z Natural remanent magnetizations (NRMs) of 5 dirt-ice layers including tephra collected from the Allan Hills in Southern Victoria Land, the Yamato Mountains and the Sφr Rondane Mountains in Eastern Queen Maud Land, East Antarctica, were investigated. The NRMs with 1.38 to 22.1×(10)^<-7>Am^2/kg in intensity were very stable against AF demagnetization at least up to 50mT. The magnetic layers consisted with the dirt-ice layers recognized by the naked eye, but magnetizations in the clear-ice were weak for any significant measurements. The uniform NRM directions were obtained in the dirt-ice layers with upward directions. Those of the oriented 2 samples (A, E) were almost parallel to the present geomagnetic field direction in situ. So, a possible mechanism is rearrangement of the magnetic grains adjusting the NRM directions to the geomagnetic field direction due to partial melting of the ice around the grains by the solar radiation. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Queen Maud Land Victoria Land Directory of Open Access Journals: DOAJ Articles East Antarctica Victoria Land Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) Queen Maud Land ENVELOPE(12.000,12.000,-72.500,-72.500) Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) |
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 Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East Antarctica |
topic_facet |
Geography (General) G1-922 |
description |
Natural remanent magnetizations (NRMs) of 5 dirt-ice layers including tephra collected from the Allan Hills in Southern Victoria Land, the Yamato Mountains and the Sφr Rondane Mountains in Eastern Queen Maud Land, East Antarctica, were investigated. The NRMs with 1.38 to 22.1×(10)^<-7>Am^2/kg in intensity were very stable against AF demagnetization at least up to 50mT. The magnetic layers consisted with the dirt-ice layers recognized by the naked eye, but magnetizations in the clear-ice were weak for any significant measurements. The uniform NRM directions were obtained in the dirt-ice layers with upward directions. Those of the oriented 2 samples (A, E) were almost parallel to the present geomagnetic field direction in situ. So, a possible mechanism is rearrangement of the magnetic grains adjusting the NRM directions to the geomagnetic field direction due to partial melting of the ice around the grains by the solar radiation. |
format |
Article in Journal/Newspaper |
author |
Minoru Funaki |
author_facet |
Minoru Funaki |
author_sort |
Minoru Funaki |
title |
Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East Antarctica |
title_short |
Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East Antarctica |
title_full |
Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East Antarctica |
title_fullStr |
Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East Antarctica |
title_full_unstemmed |
Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East Antarctica |
title_sort |
note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1990 |
url |
https://doi.org/10.15094/00008672 https://doaj.org/article/388261e0680140b89321165f98641868 |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) ENVELOPE(12.000,12.000,-72.500,-72.500) ENVELOPE(159.667,159.667,-76.717,-76.717) |
geographic |
East Antarctica Victoria Land Yamato Queen Maud Land Allan Hills |
geographic_facet |
East Antarctica Victoria Land Yamato Queen Maud Land Allan Hills |
genre |
Antarc* Antarctica East Antarctica Queen Maud Land Victoria Land |
genre_facet |
Antarc* Antarctica East Antarctica Queen Maud Land Victoria Land |
op_source |
Antarctic Record, Vol 34, Iss 2, Pp 130-138 (1990) |
op_relation |
https://doi.org/10.15094/00008672 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008672 0085-7289 2432-079X https://doaj.org/article/388261e0680140b89321165f98641868 |
op_doi |
https://doi.org/10.15094/00008672 |
_version_ |
1766099963111014400 |