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Since H_\u003cRC\u003e/H_C of ferromagnetic materials is generally smaller than 5,the observed large values of chondrites are considered anomalous. A magnetic binary system model consisting of (a)-component having large H_C and H_\u003cRC\u003e values and (b)-component having small H_C and H_\u003cRC\u003e values can approximates the anomalously large value of H_\u003cRC\u003e/H_C. Using the magnetic binary system model, Antarctic chondrites having anomalously large values of H_\u003cRC\u003e/H_C are analyzed; metallic constituents in these chondrites are decomposed into (a)-component with H_C\u0026gsim;1000Oe and (b)-component with H_C\u0026lsim;30Oe. Interest from a viewpoint of meteoritics may be concerned with following results of the analysis. (i) With the aid of thermomagnetic analysis and other methods, the high coercivity component (a) is identified to tetrataenite which has an extremely large value of H_C, while the absolute majority of (b)-component comprises relatively large grains of kamacite of multi-domain structure. (ii) Metallic fine grains in both chondrules and matrix of ALH-769 (L6) chondrite are composed of statistically same tetrataenite and kamacite. 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Magnetic analysis of Antarctic chondrites on the basis of a magnetic binary system model
https://doi.org/10.15094/00004461
https://doi.org/10.15094/00004461ec8ea42a-88cb-4330-9bd4-a610e69f616b
名前 / ファイル | ライセンス | アクション |
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KJ00000036267 (2.6 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1988-03-01 | |||||
タイトル | ||||||
タイトル | Magnetic analysis of Antarctic chondrites on the basis of a magnetic binary system model | |||||
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 | 10.15094/00004461 | |||||
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(英) |
Nagata, Takesi
× Nagata, Takesi |
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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 | Ordinary chondrites often have extremely large values of their remanence coercive force (H_<RC>) while their coercive force (H_C) is not particularly large, H_<RC>/H_C often amounting to a magnitude larger than 30. Since H_<RC>/H_C of ferromagnetic materials is generally smaller than 5,the observed large values of chondrites are considered anomalous. A magnetic binary system model consisting of (a)-component having large H_C and H_<RC> values and (b)-component having small H_C and H_<RC> values can approximates the anomalously large value of H_<RC>/H_C. Using the magnetic binary system model, Antarctic chondrites having anomalously large values of H_<RC>/H_C are analyzed; metallic constituents in these chondrites are decomposed into (a)-component with H_C≳1000Oe and (b)-component with H_C≲30Oe. Interest from a viewpoint of meteoritics may be concerned with following results of the analysis. (i) With the aid of thermomagnetic analysis and other methods, the high coercivity component (a) is identified to tetrataenite which has an extremely large value of H_C, while the absolute majority of (b)-component comprises relatively large grains of kamacite of multi-domain structure. (ii) Metallic fine grains in both chondrules and matrix of ALH-769 (L6) chondrite are composed of statistically same tetrataenite and kamacite. This result suggests that both chondrules and matrix were extremely slowly cooled down together through 320℃ in the final process of the thermal history of this chondrite. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10784627 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Meteorites 巻 1, p. 247-260, 発行日 1988-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |