Magnetic properties of Kurokami pumices from Mt. Sakurajima, Japan

Yongjae Yu; David J. Dunlop; Ozden Ozdemir; Hiromoto Ueno

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Magnetic properties of Kurokami pumices from Mt. Sakurajima, Japan

机译：黑山产的黑神p的磁性日本樱岛

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Both chromite and low-Ti titanomagnetite are carriers of natural remanent magnetization (NRM) in Kurokami andesitic pumices of Mt. Sakurajima, Japan. Thermal demagnetization of the NRM and of a laboratory isothermal remanence indicate unblocking of chromite remanence between 200 and 260 ℃ and of titanomagnetite remanence between 400 and 520 ℃. Electron microprobe analyses support the compositions Fe_(1.9)Cr_(1.1)1O_4 and Fe_(2.9)Ti_(0.1)O_4 indicated by the respective Curie temperatures of 260 ℃ and 520-530 ℃. Chromite is thermally unstable and converts to magnetite during thermal demagnetization, leading to a self-reversal of NRM between 500 and 580 ℃. The chromite contributes about 25% of the NRM intensity of the sample.

机译：亚铁山的黑神山和安山岩中的亚铬铁矿和低钛钛磁铁矿都是自然剩磁的载体。日本樱岛NRM和实验室等温剩磁的热退磁表明，在200至260℃之间铬铁矿剩磁和在400至520℃之间钛磁铁矿剩磁没有阻塞。电子探针分析支持分别由居里温度260℃和520-530℃表示的Fe_（1.9）Cr_（1.1）1O_4和Fe_（2.9）Ti_（0.1）O_4组成。铬铁矿是热不稳定的，在热退磁过程中会转变为磁铁矿，导致NRM在500至580℃之间自我反转。亚铬酸盐占样品NRM强度的25％。

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来源
《Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System》 |2001年第3期|共8页
作者
Yongjae Yu; David J. Dunlop; Ozden Ozdemir; Hiromoto Ueno;
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正文语种 eng
中图分类天文学、地球科学;
关键词
chromite; titanomagnetite; pumice; Sakura-jima; magnetic properties;

机译：亚铬铁矿;钛磁铁矿;浮石;樱花岛;磁性能;

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机译：黑山产的黑神p的磁性日本樱岛
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Magnetic properties of Kurokami pumices from Mt. Sakurajima, Japan

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