Magnetic properties of low-petrologic grade non-carbonaceous chondrites
P(論文) The magnetic properties and paleointensities of a number of non-carbonaceous chondrites show a considerable variation. Enstatite chondrites are far more magnetic than others and record ancient fields of 7 to 16 Oe. Abee has a high field, recorded in individual clasts and the random directions...
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ftnipr:oai:nipr.repo.nii.ac.jp:00001395 2024-09-09T19:51:58+00:00 Magnetic properties of low-petrologic grade non-carbonaceous chondrites Sugiura, Naoji Strangway, D.W. 1982-12 application/pdf https://nipr.repo.nii.ac.jp/record/1395/files/KJ00000012029.pdf eng eng Memoirs of National Institute of Polar Research. Special issue 25 260 280 AA00733561 https://nipr.repo.nii.ac.jp/record/1395/files/KJ00000012029.pdf 1982 ftnipr 2024-06-17T04:00:33Z P(論文) The magnetic properties and paleointensities of a number of non-carbonaceous chondrites show a considerable variation. Enstatite chondrites are far more magnetic than others and record ancient fields of 7 to 16 Oe. Abee has a high field, recorded in individual clasts and the random directions suggest the magnetization was pre-accretional. Indarch and Yamato-691 also record high fields, but have a single direction of magnetization, so we cannot infer if the magnetic record is of pre- or post-accretional origin. A series of L and LL chondrites (Bjurbole, Yamato-74191,Mezo Madaras and Chainpur) contain plessite and it is therefore only possible to infer early magnetic fields at temperatures below 550℃, the transition temperature for plessite. Nevertheless, they have random components of magnetization and it is possible therefore that they record pre-accretional remanence. If these samples were reheated as suggested by others, we cannot explain the random directions, unless it is in some way related to tetrataenite, which is highly anisotropic. Ancient fields recorded in these samples are in the range of .1-.7 Oe. Finally, ALHA77304 has no plessite, is an LL chondrite and records two components. The stable component may be of primary origin and if so records a field of 0.45 Oe. departmental bulletin paper Other/Unknown Material Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
P(論文) The magnetic properties and paleointensities of a number of non-carbonaceous chondrites show a considerable variation. Enstatite chondrites are far more magnetic than others and record ancient fields of 7 to 16 Oe. Abee has a high field, recorded in individual clasts and the random directions suggest the magnetization was pre-accretional. Indarch and Yamato-691 also record high fields, but have a single direction of magnetization, so we cannot infer if the magnetic record is of pre- or post-accretional origin. A series of L and LL chondrites (Bjurbole, Yamato-74191,Mezo Madaras and Chainpur) contain plessite and it is therefore only possible to infer early magnetic fields at temperatures below 550℃, the transition temperature for plessite. Nevertheless, they have random components of magnetization and it is possible therefore that they record pre-accretional remanence. If these samples were reheated as suggested by others, we cannot explain the random directions, unless it is in some way related to tetrataenite, which is highly anisotropic. Ancient fields recorded in these samples are in the range of .1-.7 Oe. Finally, ALHA77304 has no plessite, is an LL chondrite and records two components. The stable component may be of primary origin and if so records a field of 0.45 Oe. departmental bulletin paper |
author |
Sugiura, Naoji Strangway, D.W. |
spellingShingle |
Sugiura, Naoji Strangway, D.W. Magnetic properties of low-petrologic grade non-carbonaceous chondrites |
author_facet |
Sugiura, Naoji Strangway, D.W. |
author_sort |
Sugiura, Naoji |
title |
Magnetic properties of low-petrologic grade non-carbonaceous chondrites |
title_short |
Magnetic properties of low-petrologic grade non-carbonaceous chondrites |
title_full |
Magnetic properties of low-petrologic grade non-carbonaceous chondrites |
title_fullStr |
Magnetic properties of low-petrologic grade non-carbonaceous chondrites |
title_full_unstemmed |
Magnetic properties of low-petrologic grade non-carbonaceous chondrites |
title_sort |
magnetic properties of low-petrologic grade non-carbonaceous chondrites |
publishDate |
1982 |
url |
https://nipr.repo.nii.ac.jp/record/1395/files/KJ00000012029.pdf |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Yamato |
geographic_facet |
Yamato |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
Memoirs of National Institute of Polar Research. Special issue 25 260 280 AA00733561 https://nipr.repo.nii.ac.jp/record/1395/files/KJ00000012029.pdf |
_version_ |
1809921308136308736 |