2001年10月
Magnetic properties of Kurokami pumices from Mt. Sakurajima, Japan
EARTH AND PLANETARY SCIENCE LETTERS
- ,
- ,
- ,
- 巻
- 192
- 号
- 3
- 開始ページ
- 439
- 終了ページ
- 446
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1016/S0012-821X(01)00464-2
- 出版者・発行元
- ELSEVIER SCIENCE BV
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 degreesC and of titanomagnetite remanence between 400 and 510 degreesC. Electron microprobe analyses support the compositions Fe(1.9)Cr(1.1)1O(4) and Fe2.9Ti0.1O4 indicated by the respective Curie temperatures of 260 degreesC and 520-530 degreesC. Chromite is thermally unstable and converts to magnetite during thermal demagnetization, leading to a self-reversal of NRM between 500 and 580 degreesC. The chromite contributes about 25% of the NRM intensity of the sample. (C) 2001 Elsevier Science B.V. All rights reserved.
- リンク情報
- ID情報
-
- DOI : 10.1016/S0012-821X(01)00464-2
- ISSN : 0012-821X
- CiNii Articles ID : 30007235405
- Web of Science ID : WOS:000171914500014