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On the other hand, the Ordovician VGPs from elsewhere in East Antarctica are significantly deviated from those from the Sør Rondane Mountains These facts lead us to a conclusion that the mass of the Sør Rondane Mountains was undeformed locally, but tilted as a whole relatively to the rest mass in East Antarctica. A Precambrian VGP, 60.4°S, 21.5°W in 662±23 Ma, was estimated from magnetically cleaned remanences and a newly determined ^\u003c40\u003eAr-^\u003c39\u003eAr age of Nils Larsenfjellet tonalites, with further proposing of an apparent polar-wander path (APWP) for Precambrian to Cambro-Ordovician from Nils Larsenfjellet. No attempt of thermal demagnetizations and other methods of the rockmagnetism have been done to verify the quality of the magnetically cleaned remanence. 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TILTING MOVEMENT OF SØR RONDANE MOUNTAINS AND POSSIBLE APPARENT POLAR-WANDER PATH FOR PRECAMBRIAN TO CAMBRO-ORDOVICIAN FROM NILS LARSENFJELLET
https://doi.org/10.15094/00002688
https://doi.org/10.15094/00002688363d3ca0-fd61-465c-85bf-f0cb1b22c894
名前 / ファイル | ライセンス | アクション |
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KJ00002368271 (2.3 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1991-09-01 | |||||
タイトル | ||||||
タイトル | TILTING MOVEMENT OF SØR RONDANE MOUNTAINS AND POSSIBLE APPARENT POLAR-WANDER PATH FOR PRECAMBRIAN TO CAMBRO-ORDOVICIAN FROM NILS LARSENFJELLET | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00002688 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名よみ |
トキエダ, カツヤス
× トキエダ, カツヤス× フナキ, ミノル |
|||||
著者名(英) |
TOKIEDA, Katsuyasu
× TOKIEDA, Katsuyasu× FUNAKI, Minoru |
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著者所属(英) | ||||||
en | ||||||
Department of Physics, Faculty of Sciences, Shimane University | ||||||
著者所属(英) | ||||||
en | ||||||
National Institute of Polar Research | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Alternating field demagnetizations were performed for 479 hand samples (32 sites) collected from the Sør Rondane Mountains, East Antarctica. Clear convergence of natural remanent magnetization (NRM) was observed for only 82 samples (17%) from 8 sites. They were dolerites, tonalites, syenites and hornblendites, all having NRM strength more than 10^<-6>Am^2/kg. Samples less than 10^<-7>Am^2/kg, including granites, granitic rocks and granitic dike or vein, yielded no paleomagnetically significant results. The virtual geomagnetic pole positions (VGP) from 1550 nunatak dolerite, Brattnipene dolerite and Lunckeryggen syenite fall on a fairly small area, well matching with reported ones from Pingvinane granite and some rocks in the Sør Rondane Mountains. Their radiometric ages are confined to early Ordovician. On the other hand, the Ordovician VGPs from elsewhere in East Antarctica are significantly deviated from those from the Sør Rondane Mountains These facts lead us to a conclusion that the mass of the Sør Rondane Mountains was undeformed locally, but tilted as a whole relatively to the rest mass in East Antarctica. A Precambrian VGP, 60.4°S, 21.5°W in 662±23 Ma, was estimated from magnetically cleaned remanences and a newly determined ^<40>Ar-^<39>Ar age of Nils Larsenfjellet tonalites, with further proposing of an apparent polar-wander path (APWP) for Precambrian to Cambro-Ordovician from Nils Larsenfjellet. No attempt of thermal demagnetizations and other methods of the rockmagnetism have been done to verify the quality of the magnetically cleaned remanence. A serious paleomagnetic significance is provided, however, with the fact that the analogous VGPs were obtained from a variety of rocks of similar ages. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1072335X | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Geosciences 巻 5, p. 61-74, 発行日 1991-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |