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They are Santa Catharina and Twin City Ni-rich ataxites, taenite lamellae from Toluca and Itutinga octahedrites and St. Severin and Appley Bridge LL chondrites. The contents of γ\u0027-phase in these standard γ\u0027-rich meteorites were determined by the Mossbauer spectral analysis and their magnetic hysteresis and thermomagnetic characteristics were examined. The magnetic criteria for γ\u0027-rich meteorites derived from the present study are summarized as follows : (1) Remanence coercive force (H_\u003cRC\u003e) is anomalously large (i. e. H_\u003cRC\u003e\u0026ge;500 Oe). (2) The apparent Curie point is 560-580℃. (3) The initial heating thermomagnetic (TM) curve of the γ\u0027-phase is flat below about 500℃ and then sharply drops down to the apparent Curie point. (4) After heating to temperatures above 700℃, the γ\u0027-phase is broken down to the ordinary disordered γ-phase, so that the first-cooling curve and subsequent TM curves have the characteristics of those of γ-phase. 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Tetrataenite phase in Antarctic meteorites
https://nipr.repo.nii.ac.jp/records/2138
https://nipr.repo.nii.ac.jp/records/21386d53d47e-2489-4250-806b-88efad56c9ef
名前 / ファイル | ライセンス | アクション |
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KJ00000012691 (2.1 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1987-03-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Tetrataenite phase in Antarctic meteorites | |||||
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 | |||||
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× Funaki, Minoru |
|||||
著者所属(英) | ||||||
en | ||||||
National Institute of Polar Research | ||||||
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 | Four Ni-rich iron meteorites containing tetrataenite (γ'-phase of Fe-Ni metal) and 2 LL chondrites containing the γ'-phase are provisionally selected as the standard γ'-rich meteorites. They are Santa Catharina and Twin City Ni-rich ataxites, taenite lamellae from Toluca and Itutinga octahedrites and St. Severin and Appley Bridge LL chondrites. The contents of γ'-phase in these standard γ'-rich meteorites were determined by the Mossbauer spectral analysis and their magnetic hysteresis and thermomagnetic characteristics were examined. The magnetic criteria for γ'-rich meteorites derived from the present study are summarized as follows : (1) Remanence coercive force (H_<RC>) is anomalously large (i. e. H_<RC>≥500 Oe). (2) The apparent Curie point is 560-580℃. (3) The initial heating thermomagnetic (TM) curve of the γ'-phase is flat below about 500℃ and then sharply drops down to the apparent Curie point. (4) After heating to temperatures above 700℃, the γ'-phase is broken down to the ordinary disordered γ-phase, so that the first-cooling curve and subsequent TM curves have the characteristics of those of γ-phase. (5) Because of the break-down of γ'-phase during the heating procedure, H_C and H_<RC> are much reduced, by up to one order of magnitude or more from their pre-heating initial values. In the present experimental study, 5 Antarctic L chondrites and 4 Antarctic LL chondrites are magnetically examined. The Antarctic chondrites which satisfy the five criteria for γ'-rich meteorites are Yamato-74354 (L6), -74362 (L6), -74442 (L6), ALH-76009 (L6) and Y-790964 (LL). | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 46, p. 245-262, 発行日 1987-03 |