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For ALH-77302 eucrite, F_p can be determined by the method as F_p=0.110/\u0026fnof;_0 Oe. However, an experimental determination of f_0 for meteorites is associated with much difficulty caused by chemical and structural alterations of ferromagnetic Fe-Ni metals at elevated temperatures. A three step heating procedure which is a modification of the original TAYLOR\u0027s technique (1979) is adopted in the present study with a satisfactory success of not altering the magnetic microscopic coercivity spectrum by heating up to 790℃. The procedure consists of the first heat treatment to rid a meteorite sample of H_2O vapour and loosely-bound gases at 110℃ in a low vacuum space for an hour, the second one to take out tightly-bounded gases at 355℃ in a high vacuum space with the help of the Ti-metal getter to absorb gases for an hour and a half, and then heating to any higher temperature to give pTRM or total TRM on the sample in the same high vacuum system. The f_0 value of ALH-77302 thus obtained is f_0=6.80,and consequently F_p of ALH-77302 eucrite has been obtained as F_p=0.016 Oe. F_p=0.021 Oe for another test specimen of the same eucrite. 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Paleomagnetism of Antarctic achondrites (II)
https://nipr.repo.nii.ac.jp/records/1226
https://nipr.repo.nii.ac.jp/records/122689fbc487-7066-4bac-a61d-ebc2f1d25e63
名前 / ファイル | ライセンス | アクション |
---|---|---|
KJ00000011752 (2.0 MB)
|
Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1981-12-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Paleomagnetism of Antarctic achondrites (II) | |||||
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× Dunn, J.R. |
|||||
著者所属(英) | ||||||
en | ||||||
National Institute of Polar Research | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Geological Sciences, University of California | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | The paleointensity (F_p) of NRM of the TRM origin can be approximately estimated by comparing the NRM-lost obtained by the stepwise AF-demagnetization of NRM with the ARM-lost obtained by the same AF-demagnetization of the saturated ARM acquired in a magnetic field h_A through a possible relation of (NRM-lost)/F_p=ƒ_0(ARM-lost)/h_A, where NRM is assumed to be identical to a total TRM acquired in F_p, and the coefficient ƒ_0 must be experimentally determined. For ALH-77302 eucrite, F_p can be determined by the method as F_p=0.110/ƒ_0 Oe. However, an experimental determination of f_0 for meteorites is associated with much difficulty caused by chemical and structural alterations of ferromagnetic Fe-Ni metals at elevated temperatures. A three step heating procedure which is a modification of the original TAYLOR's technique (1979) is adopted in the present study with a satisfactory success of not altering the magnetic microscopic coercivity spectrum by heating up to 790℃. The procedure consists of the first heat treatment to rid a meteorite sample of H_2O vapour and loosely-bound gases at 110℃ in a low vacuum space for an hour, the second one to take out tightly-bounded gases at 355℃ in a high vacuum space with the help of the Ti-metal getter to absorb gases for an hour and a half, and then heating to any higher temperature to give pTRM or total TRM on the sample in the same high vacuum system. The f_0 value of ALH-77302 thus obtained is f_0=6.80,and consequently F_p of ALH-77302 eucrite has been obtained as F_p=0.016 Oe. F_p=0.021 Oe for another test specimen of the same eucrite. The paleointensity of ALH-77302 eucrite is therefore approximately 0.02 Oe. | |||||
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 20, p. 333-344, 発行日 1981-12 |