Shape of Fe-Ni grains and magnetic susceptibility anisotropy in Antarctic chondrites
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概要
- 論文の詳細を見る
Magnetic susceptibility anisotropy is measured for various petrologic types of ordinary chondrites from Antarctica, which are three H types : ALH-77233 (H4), ALH-77182 (H5) and ALH-77115 (H6); four L types : Y-74191 (L3), ALH-77230 (L4), ALH-77254 (L5) and ALH-77231 (L6); and four LL types : Y-75258 (LL6), Y-790519 (LL), Y-790723 (LL) and Y-790964 (LL). The last three are shock-melted chondrites and have high strengths, whereas Y-75258 has a very low strength. Magnetic susceptibility anisotropy appears to be low for LL chondrites and seems to bear no correlation with porosity and petrologic types among H and L chondrites. Both prolate and oblate susceptibility ellipsoids are obtained. To characterize the shape irregularity of metallic grains, the Fourier descriptors representation with an arc-length coordinate system is introduced for two-dimensional outline of grains. Unlike the normally used polar coordinate system, this method is applicable to any complicated shape of grain boundary. Some advantages of the present method are demonstrated for several selected Fe-Ni grains from the same specimens as those used for the magnetic and the strength measurements. Newly proposed parameters representing deviations from circular and elliptical shapes are shown to distinguish different complex outlines of Fe-Ni grains.
- 国立極地研究所の論文
著者
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Ito Keisuke
Department Of Earth Sciences Faculty Of Science Kobe University
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Miyamoto Masamichi
Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo
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Fujii Naoyuki
Department of Earth Sciences, Faculty of Science, Kobe University
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Hamano Yozo
Geological Institute, Faculty of Science, University of Tokyo
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Hamano Yozo
Geological Institute Faculty Of Science University Of Tokyo
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Fujii Naoyuki
Department Of Earth Sciences Faculty Of Science Kobe University
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Ito Keisuke
Department Of Applied Biological Chemistry Graduate School Of Agricultural And Life Sciences The Uni
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Miyamoto Masamichi
Department Of Earth And Planetary Science Graduate School Of Science University Of Tokyo
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