THE MAGNETIC ANISOTROPY OF GNEISSIC ROCKS FROM THE SKARVSNES AREA, EAST ANTARCTICA
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概要
- 論文の詳細を見る
The relationship between magnetic anisotropy and natural remanent magnetization (NRM) was investigated in the gneissic rocks collected from Skarvsnes, Lutzow-Holm Bay, East Antarctica. About 60% of the samples show clear gneissosity, but 40% of the samples have less clear gneissosity. The samples with gneissic fabric show magnetic anisotropy. The maximum value of H_C and I_R, and the minimum values of X_<diff> coincide with the lineation within a foliation plane. During thermal demagnetization of the samples having stable NRM's, the NRM declinations are gradually shifted toward the direction of lineation, and they are stabilized in a plane, within the rock, having well developed foliation. The anisotropy tendency is more clearly observed by using the H_C and I_R values than X_<diff> values. Two kinds of virtual geomagnetic pole (VGP) positions are identified from the Skarvsnes area. The former is consistent (latitude 11.2°S, longitude 16.0°E) with the previous results reported from the Lutzow-Holm Bay area, and the latter (latitude 2.5°S, longitude 63.2°E) reflects the magnetic anisotropy resulting from the lineation.
- 国立極地研究所の論文
著者
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Funaki Minoru
National Institute of Polar Research
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NAKAI Mutsumi
Department of Polar Science, The Graduate University for Advanced Studies (National Institute of Pol
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WASILEWSKI Peter
NASA Goddard Space Flight Center
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Nakai M
Graduate Univ. Advance Studies National Inst. Polar Research Tokyo
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Nakai Mutsumi
Department Of Polar Science The Graduate University For Advanced Studies (national Institute Of Pola
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Funaki Minoru
National Inst. Of Polar Res. 9-10 Kaga 1 Itabashi Tokyo 173-8515 Jpn
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