PRELIMINARY REPORT ON PALEOMAGNETIC STUDY OF ROCKS FROM THE MT. RIISER-LARSEN AREA IN ENDERBY LAND, EAST ANTARCTICA
Paleomagnetic samples were collected at eight sites from granulites of the Archean Napier Complex and dolerite dikes intruding the complex in the Mt. Riiser-Larsen area in Enderby Land, East Antarctica. Progressive demagnetization results indicate the presence of two magnetic components : the low-st...
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School of Earth Sciences, IHS, Kyoto University
1997
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ftnipr:oai:nipr.repo.nii.ac.jp:00002845 2023-05-15T13:49:00+02:00 PRELIMINARY REPORT ON PALEOMAGNETIC STUDY OF ROCKS FROM THE MT. RIISER-LARSEN AREA IN ENDERBY LAND, EAST ANTARCTICA イシカワ ナオト フナキ ミノル Naoto ISHIKAWA Minoru FUNAKI 1997-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2845 http://id.nii.ac.jp/1291/00002845/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2845&item_no=1&attribute_id=18&file_no=1 en eng School of Earth Sciences, IHS, Kyoto University National Institute of Polar Reserch National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2845 http://id.nii.ac.jp/1291/00002845/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 10, 79-91(1997-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2845&item_no=1&attribute_id=18&file_no=1 paleomagnetism the Napier Complex the Amundsen dikes East Gondwanaland Departmental Bulletin Paper P(論文) 1997 ftnipr 2022-11-26T19:42:17Z Paleomagnetic samples were collected at eight sites from granulites of the Archean Napier Complex and dolerite dikes intruding the complex in the Mt. Riiser-Larsen area in Enderby Land, East Antarctica. Progressive demagnetization results indicate the presence of two magnetic components : the low-stability (L) and high-stability (H) components. A principal carrier of the H component is fine-grained magnetite, while the L component may be carried by coarser titanomagnetite. L components with steep negative inclination were remarkably observed in both granulite and dolerite samples. The characteristic L component is considered as a viscous remanence (VRM) in the recent geomagnetic field. A complete overprint of the VRM is observed in samples from one granulite site. The H components of two dolerite sites have positive inclinations, and their virtual geomagnetic pole positions are situated near the segment of the apparent polar wander path between 1.0 and 1.2 Ga for Australia in the East Gondwanaland frame. This may imply that the formation of East Gondwanaland can be dated back to about 1.2 Ga, if the intrusions of the dolerite dikes was related to the Amundsen dike activity in the Napier complex. The H component direction determined at one granulite site is inconsistent with other component directions, implying the possibility that the remanence might have been acquired before the intrusion of the dolerite dikes. Report Antarc* Antarctica East Antarctica Enderby Land Geomagnetic Pole National Institute of Polar Research Repository, Japan East Antarctica Riiser-Larsen ENVELOPE(50.667,50.667,-66.783,-66.783) Napier ENVELOPE(-58.440,-58.440,-62.167,-62.167) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
paleomagnetism the Napier Complex the Amundsen dikes East Gondwanaland |
spellingShingle |
paleomagnetism the Napier Complex the Amundsen dikes East Gondwanaland イシカワ ナオト フナキ ミノル Naoto ISHIKAWA Minoru FUNAKI PRELIMINARY REPORT ON PALEOMAGNETIC STUDY OF ROCKS FROM THE MT. RIISER-LARSEN AREA IN ENDERBY LAND, EAST ANTARCTICA |
topic_facet |
paleomagnetism the Napier Complex the Amundsen dikes East Gondwanaland |
description |
Paleomagnetic samples were collected at eight sites from granulites of the Archean Napier Complex and dolerite dikes intruding the complex in the Mt. Riiser-Larsen area in Enderby Land, East Antarctica. Progressive demagnetization results indicate the presence of two magnetic components : the low-stability (L) and high-stability (H) components. A principal carrier of the H component is fine-grained magnetite, while the L component may be carried by coarser titanomagnetite. L components with steep negative inclination were remarkably observed in both granulite and dolerite samples. The characteristic L component is considered as a viscous remanence (VRM) in the recent geomagnetic field. A complete overprint of the VRM is observed in samples from one granulite site. The H components of two dolerite sites have positive inclinations, and their virtual geomagnetic pole positions are situated near the segment of the apparent polar wander path between 1.0 and 1.2 Ga for Australia in the East Gondwanaland frame. This may imply that the formation of East Gondwanaland can be dated back to about 1.2 Ga, if the intrusions of the dolerite dikes was related to the Amundsen dike activity in the Napier complex. The H component direction determined at one granulite site is inconsistent with other component directions, implying the possibility that the remanence might have been acquired before the intrusion of the dolerite dikes. |
format |
Report |
author |
イシカワ ナオト フナキ ミノル Naoto ISHIKAWA Minoru FUNAKI |
author_facet |
イシカワ ナオト フナキ ミノル Naoto ISHIKAWA Minoru FUNAKI |
author_sort |
イシカワ ナオト |
title |
PRELIMINARY REPORT ON PALEOMAGNETIC STUDY OF ROCKS FROM THE MT. RIISER-LARSEN AREA IN ENDERBY LAND, EAST ANTARCTICA |
title_short |
PRELIMINARY REPORT ON PALEOMAGNETIC STUDY OF ROCKS FROM THE MT. RIISER-LARSEN AREA IN ENDERBY LAND, EAST ANTARCTICA |
title_full |
PRELIMINARY REPORT ON PALEOMAGNETIC STUDY OF ROCKS FROM THE MT. RIISER-LARSEN AREA IN ENDERBY LAND, EAST ANTARCTICA |
title_fullStr |
PRELIMINARY REPORT ON PALEOMAGNETIC STUDY OF ROCKS FROM THE MT. RIISER-LARSEN AREA IN ENDERBY LAND, EAST ANTARCTICA |
title_full_unstemmed |
PRELIMINARY REPORT ON PALEOMAGNETIC STUDY OF ROCKS FROM THE MT. RIISER-LARSEN AREA IN ENDERBY LAND, EAST ANTARCTICA |
title_sort |
preliminary report on paleomagnetic study of rocks from the mt. riiser-larsen area in enderby land, east antarctica |
publisher |
School of Earth Sciences, IHS, Kyoto University |
publishDate |
1997 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2845 http://id.nii.ac.jp/1291/00002845/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2845&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(50.667,50.667,-66.783,-66.783) ENVELOPE(-58.440,-58.440,-62.167,-62.167) |
geographic |
East Antarctica Riiser-Larsen Napier |
geographic_facet |
East Antarctica Riiser-Larsen Napier |
genre |
Antarc* Antarctica East Antarctica Enderby Land Geomagnetic Pole |
genre_facet |
Antarc* Antarctica East Antarctica Enderby Land Geomagnetic Pole |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2845 http://id.nii.ac.jp/1291/00002845/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 10, 79-91(1997-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2845&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250320371908608 |