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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| Format: | Article |
| Language: | English |
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National Institute of Polar Research
1990-07-01
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| Series: | Antarctic Record |
| Online Access: | https://doi.org/10.15094/00008672 |
| _version_ | 1818611868295495680 |
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| author | Minoru Funaki |
| author_facet | Minoru Funaki |
| author_sort | Minoru Funaki |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-16T15:37:10Z |
| format | Article |
| id | doaj.art-388261e0680140b89321165f98641868 |
| institution | Directory Open Access Journal |
| issn | 0085-7289 2432-079X |
| language | English |
| last_indexed | 2024-12-16T15:37:10Z |
| publishDate | 1990-07-01 |
| publisher | National Institute of Polar Research |
| record_format | Article |
| series | Antarctic Record |
| spelling | doaj.art-388261e0680140b89321165f986418682022-12-21T22:26:08ZengNational Institute of Polar ResearchAntarctic Record0085-72892432-079X1990-07-0134213013810.15094/00008672Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East AntarcticaMinoru Funaki0National Institute of Polar ResearchNatural 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.https://doi.org/10.15094/00008672 |
| spellingShingle | Minoru Funaki Note on the natural remanent magnetizations of dirt-ice layers collected from the bare ice field in East Antarctica Antarctic Record |
| title | 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_short | 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 |
| url | https://doi.org/10.15094/00008672 |
| work_keys_str_mv | AT minorufunaki noteonthenaturalremanentmagnetizationsofdirticelayerscollectedfromthebareicefieldineastantarctica |