کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4742670 | 1641602 | 2006 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
N-type magnetism at cryogenic temperatures in oceanic basalt
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: N-type magnetism at cryogenic temperatures in oceanic basalt N-type magnetism at cryogenic temperatures in oceanic basalt](/preview/png/4742670.png)
چکیده انگلیسی
Here we report on a self-reversal of magnetization at cryogenic temperatures (25-60 K) due to N-type thermomagnetic behavior in samples of Cretaceous mid-oceanic ridge basalt recovered from Pacific Deep Sea Drilling Project Site 166. The magnetic carrier is highly oxidized single to pseudo-single domain titanomaghemite with a composition (0.57 â¤Â x â¤Â 0.66, 0.8 â¤Â z â¤Â 0.9) consistent with model predictions of ionic reordering. The observation of N-type magnetization provides further insight into the compositional field in which ionic reordering and self-reversal can occur in oceanic basalt. Specifically, our observations support the original models of Verhoogen [Verhoogen, J., 1956. Ionic reordering and self-reversal of magnetization in impure magnetites. J. Geophys. Res. 61, 201-209; Verhoogen, J., 1962. Oxidation of iron-titanium oxides in igneous rocks. J. Geol. 70, 168-181] and O'Reilly and Banerjee [O'Reilly, W., Banerjee, S.K., 1966. Oxidation of titanomagnetites and self-reversal. Nature 211 (5044), 26-28] indicating that self-reversal above and below room temperature is limited to relatively high titanium contents (x > 0.6) and high oxidation states.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 157, Issues 1â2, 14 August 2006, Pages 46-54
Journal: Physics of the Earth and Planetary Interiors - Volume 157, Issues 1â2, 14 August 2006, Pages 46-54
نویسندگان
Pavel V. Doubrovine, John A. Tarduno,