Preliminary report on paleomagnetic study of the Yamato Mountains (Massifs B and C), East Antarctica
Paleomagnetic measurements were performed on granitic gneisses, syenites and granitic dike rocks from Massifs B and C of the Yamato Mountains in East Antarctica. The stable magnetic components carried by magnetite were isolated from granitic gneiss samples from two sites at Massif B and syenite samp...
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School of Earth Sciences, IHS, Kyoto University
1998
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ftnipr:oai:nipr.repo.nii.ac.jp:00003024 2023-05-15T13:49:00+02:00 Preliminary report on paleomagnetic study of the Yamato Mountains (Massifs B and C), East Antarctica Naoto Ishikawa Minoru Funaki 1998-10 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3024 http://id.nii.ac.jp/1291/00003024/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3024&item_no=1&attribute_id=18&file_no=1 en eng School of Earth Sciences, IHS, Kyoto University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3024 http://id.nii.ac.jp/1291/00003024/ AA1130866X Polar geoscience, 11, 132-142(1998-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3024&item_no=1&attribute_id=18&file_no=1 paleomagnetism AMS the Yamato Mountains East Gondwanaland Departmental Bulletin Paper P(論文) 1998 ftnipr 2022-11-26T19:42:23Z Paleomagnetic measurements were performed on granitic gneisses, syenites and granitic dike rocks from Massifs B and C of the Yamato Mountains in East Antarctica. The stable magnetic components carried by magnetite were isolated from granitic gneiss samples from two sites at Massif B and syenite samples from two sites at Massif C. The component directions are well grouped in each massif, but are different between the two massifs. The virtual geomagnetic pole (VGP) position of the gneisses is near the Cambrian, Silurian and upper Devonian segments of the apparent polar wander path (APWP) of East Gondwanaland, while that of the syenites is near the Ordovician segment. These comparisons are not supported by previous K-Ar age data, except the comparison between the gneiss pole and the upper Devonian segment of the APWP. The anisotropy of magnetic susceptibility (AMS) was also measured for samples at the four sites. The gneisses and syenites showed consistent magnetic fabrics within each massif. Especially, the Kl direction of the gneisses is almost parallel to the petrographical foliation. The following possibilities may be considered in order to explain the inconsistency between the VGP positions and the APWP of East Gondwanaland and the difference in the VGP positions between the gneisses and syenites: (1) differential tectonic movement between the two massifs and/or (2) the deviation of remanent acquisition in anisotropic rock or internal deformation in the rock bodies. Report Antarc* Antarctica East Antarctica Geomagnetic Pole Polar geoscience National Institute of Polar Research Repository, Japan East Antarctica 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 |
topic |
paleomagnetism AMS the Yamato Mountains East Gondwanaland |
spellingShingle |
paleomagnetism AMS the Yamato Mountains East Gondwanaland Naoto Ishikawa Minoru Funaki Preliminary report on paleomagnetic study of the Yamato Mountains (Massifs B and C), East Antarctica |
topic_facet |
paleomagnetism AMS the Yamato Mountains East Gondwanaland |
description |
Paleomagnetic measurements were performed on granitic gneisses, syenites and granitic dike rocks from Massifs B and C of the Yamato Mountains in East Antarctica. The stable magnetic components carried by magnetite were isolated from granitic gneiss samples from two sites at Massif B and syenite samples from two sites at Massif C. The component directions are well grouped in each massif, but are different between the two massifs. The virtual geomagnetic pole (VGP) position of the gneisses is near the Cambrian, Silurian and upper Devonian segments of the apparent polar wander path (APWP) of East Gondwanaland, while that of the syenites is near the Ordovician segment. These comparisons are not supported by previous K-Ar age data, except the comparison between the gneiss pole and the upper Devonian segment of the APWP. The anisotropy of magnetic susceptibility (AMS) was also measured for samples at the four sites. The gneisses and syenites showed consistent magnetic fabrics within each massif. Especially, the Kl direction of the gneisses is almost parallel to the petrographical foliation. The following possibilities may be considered in order to explain the inconsistency between the VGP positions and the APWP of East Gondwanaland and the difference in the VGP positions between the gneisses and syenites: (1) differential tectonic movement between the two massifs and/or (2) the deviation of remanent acquisition in anisotropic rock or internal deformation in the rock bodies. |
format |
Report |
author |
Naoto Ishikawa Minoru Funaki |
author_facet |
Naoto Ishikawa Minoru Funaki |
author_sort |
Naoto Ishikawa |
title |
Preliminary report on paleomagnetic study of the Yamato Mountains (Massifs B and C), East Antarctica |
title_short |
Preliminary report on paleomagnetic study of the Yamato Mountains (Massifs B and C), East Antarctica |
title_full |
Preliminary report on paleomagnetic study of the Yamato Mountains (Massifs B and C), East Antarctica |
title_fullStr |
Preliminary report on paleomagnetic study of the Yamato Mountains (Massifs B and C), East Antarctica |
title_full_unstemmed |
Preliminary report on paleomagnetic study of the Yamato Mountains (Massifs B and C), East Antarctica |
title_sort |
preliminary report on paleomagnetic study of the yamato mountains (massifs b and c), east antarctica |
publisher |
School of Earth Sciences, IHS, Kyoto University |
publishDate |
1998 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3024 http://id.nii.ac.jp/1291/00003024/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3024&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
East Antarctica Yamato |
geographic_facet |
East Antarctica Yamato |
genre |
Antarc* Antarctica East Antarctica Geomagnetic Pole Polar geoscience |
genre_facet |
Antarc* Antarctica East Antarctica Geomagnetic Pole Polar geoscience |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3024 http://id.nii.ac.jp/1291/00003024/ AA1130866X Polar geoscience, 11, 132-142(1998-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3024&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250336294535168 |