Magnetic Properties of Yamato-7301(j), -7305(k) and -7304(m) Chondrites in Comparison with Their Mineralogical and Chemical Compositions
P(論文) Magnetic properties, represented by the magnetic hysteresis curves at room temperature and the thermomagnetic curves, of Yamato-7301 (j), -7305 (k), and -7304 (m) chondrites are compared with their chemical and petrographic compositions. Yamato (j) chondrite (H4) contains a metallic phase of 8...
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ftnipr:oai:nipr.repo.nii.ac.jp:00000972 2024-09-09T19:51:59+00:00 Magnetic Properties of Yamato-7301(j), -7305(k) and -7304(m) Chondrites in Comparison with Their Mineralogical and Chemical Compositions Nagata, Takesi 1979-03 application/pdf https://nipr.repo.nii.ac.jp/record/972/files/KJ00000011518.pdf eng eng Memoirs of National Institute of Polar Research. Special issue 12 250 269 AA00733561 https://nipr.repo.nii.ac.jp/record/972/files/KJ00000011518.pdf 1979 ftnipr 2024-06-17T04:04:49Z P(論文) Magnetic properties, represented by the magnetic hysteresis curves at room temperature and the thermomagnetic curves, of Yamato-7301 (j), -7305 (k), and -7304 (m) chondrites are compared with their chemical and petrographic compositions. Yamato (j) chondrite (H4) contains a metallic phase of 8.0wt% comprising kamacite of 5.3wt% Ni and smaller amounts of plessite and taenite, accompanied by non-magnetic metallic oxides. It seems very likely that the metallic oxides were in the form of hydroxides in the original state and were transformed to substituted magnetites by a heating. The metallic phase has been much oxidized by severe weathering. Yamato (k) chondrite (L5) contains a metallic phase of 8.6wt% comprising kamacite of 6.5wt% Ni and α_2-phase of (13-25)wt% Ni, suggesting that this chondrite was reheated to about 1000℃ and rapidly cooled to result in a production of α_2-phase. Yamato (m) chondrite (L5) contains a metallic phase of 8.3wt% comprising kamacite of 5.5wt% Ni and taenite, suggesting that this chondrite was almost equilibrated because of its very slow cooling and no appreciable effect of later metamorphism. Tables 3 and 4 give their basic magnetic properties, and Table 2 their chemical compositions. departmental bulletin paper Other/Unknown Material Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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English |
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P(論文) Magnetic properties, represented by the magnetic hysteresis curves at room temperature and the thermomagnetic curves, of Yamato-7301 (j), -7305 (k), and -7304 (m) chondrites are compared with their chemical and petrographic compositions. Yamato (j) chondrite (H4) contains a metallic phase of 8.0wt% comprising kamacite of 5.3wt% Ni and smaller amounts of plessite and taenite, accompanied by non-magnetic metallic oxides. It seems very likely that the metallic oxides were in the form of hydroxides in the original state and were transformed to substituted magnetites by a heating. The metallic phase has been much oxidized by severe weathering. Yamato (k) chondrite (L5) contains a metallic phase of 8.6wt% comprising kamacite of 6.5wt% Ni and α_2-phase of (13-25)wt% Ni, suggesting that this chondrite was reheated to about 1000℃ and rapidly cooled to result in a production of α_2-phase. Yamato (m) chondrite (L5) contains a metallic phase of 8.3wt% comprising kamacite of 5.5wt% Ni and taenite, suggesting that this chondrite was almost equilibrated because of its very slow cooling and no appreciable effect of later metamorphism. Tables 3 and 4 give their basic magnetic properties, and Table 2 their chemical compositions. departmental bulletin paper |
author |
Nagata, Takesi |
spellingShingle |
Nagata, Takesi Magnetic Properties of Yamato-7301(j), -7305(k) and -7304(m) Chondrites in Comparison with Their Mineralogical and Chemical Compositions |
author_facet |
Nagata, Takesi |
author_sort |
Nagata, Takesi |
title |
Magnetic Properties of Yamato-7301(j), -7305(k) and -7304(m) Chondrites in Comparison with Their Mineralogical and Chemical Compositions |
title_short |
Magnetic Properties of Yamato-7301(j), -7305(k) and -7304(m) Chondrites in Comparison with Their Mineralogical and Chemical Compositions |
title_full |
Magnetic Properties of Yamato-7301(j), -7305(k) and -7304(m) Chondrites in Comparison with Their Mineralogical and Chemical Compositions |
title_fullStr |
Magnetic Properties of Yamato-7301(j), -7305(k) and -7304(m) Chondrites in Comparison with Their Mineralogical and Chemical Compositions |
title_full_unstemmed |
Magnetic Properties of Yamato-7301(j), -7305(k) and -7304(m) Chondrites in Comparison with Their Mineralogical and Chemical Compositions |
title_sort |
magnetic properties of yamato-7301(j), -7305(k) and -7304(m) chondrites in comparison with their mineralogical and chemical compositions |
publishDate |
1979 |
url |
https://nipr.repo.nii.ac.jp/record/972/files/KJ00000011518.pdf |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Yamato |
geographic_facet |
Yamato |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
Memoirs of National Institute of Polar Research. Special issue 12 250 269 AA00733561 https://nipr.repo.nii.ac.jp/record/972/files/KJ00000011518.pdf |
_version_ |
1809921344741048320 |