Magnetic fabric analysis of deformed rocks in the Riiser-Larsen Main Shear Zone, East Antarctica
スポンサーリンク
概要
- 論文の詳細を見る
Anisotropy of magnetic susceptibility (AMS) in deformed rocks in the Riiser-Larsen Main Shear Zone (RLMSZ) was analyzed in order to demonstrate the changes in rock magnetic properties due to deformation. Sixty-nine samples were collected at six sites from sheared gneisses and sheared dolerites. Experimental results of stepwise acquisition of isothermal remanence, demagnetization of a composite IRM and thermomagnetic measurement indicate the presence of Ti-poor titanomagnetite. Pyrrhotite also occurs characteristically in specimens with mylonitic textures. Magnetic foliations of AMS for the mylonite at three sites show good agreement with mylonitic foliation at each site. The mylonites showed enhancement of anisotropy degree from protoliths, indicating overprinting of the original magnetic fabrics. Their maximum susceptibility axes are well defined within each site, and dip about 50-60° northward. The magnetic lineation probably indicates the maximum stretching direction in the RLMSZ.
- 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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Nishioka Itoyuki
Graduate School of Human and Environmental Studies, Kyoto University
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Ishikawa Naoto
Graduate School of Human and Environmental Studies, Kyoto University
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Ishikawa Naoto
Graduate School Of Human And Environmental Studies Kyoto University
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Nishioka Itoyuki
Graduate School Of Human And Environmental Studies Kyoto University
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Funaki Minoru
National Inst. Of Polar Res. 9-10 Kaga 1 Itabashi Tokyo 173-8515 Jpn
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Ishikawa Naoto
Kyoto Univ. Kyoto
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