JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS10] [JJ] Formation and evolution of planetary materials in the solar system

Mon. May 22, 2017 3:30 PM - 5:00 PM Convention Hall A (International Conference Hall 2F)

convener:Tomohiro Usui(Earth-Life Science Institute, Tokyo Institute of Technology ), Masaaki Miyahara(Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University), Akira Yamaguchi(National Institute of Polar Research), Yoko Kebukawa(Faculty of Engineering, Yokohama National University), Chairperson:Tomohiro Usui(Earth-Life Science Institute, Tokyo Institute of Technology )

4:45 PM - 5:00 PM

[PPS10-06] Nanometer-scale paleomagnetism of meteorites using electron holography

*Yuki Kimura1, Kazuo Yamamoto2 (1.Institute of Low Temperature Science, Hokkaido University, 2.Japan Fine Ceramics Center)

Keywords:Electron holography, Remanent magnetization, Transmission electron microscopy, Tagish Lake meteorite, Magnetite, Aqueous alteration

Remanent magnetization of minerals is very sensitive to the formation and experienced environments such as temperature and magnetic field. To better understand the formation environments of individual extraterrestrial minerals, we attempted to apply the electron holography to nanoparticles extracting from a meteorite. As the result, we succeeded to elucidate a magnetic structure of framboidal magnetite, which has been aligned periodically in three-dimensionally and proposed its formation process in a parent body of the Tagish Lake meteorite [1]. This method will allow us to reveal formation temperature of individual tiny minerals in the solar nebula and precipitation temperature of individual minerals during thermal aqueous alteration inside a corresponding asteroid. More resent years, several reports about paleomagnetic studies of meteorites has been reported [e.g. 2]. Here, we will show our present approaches to visualize the magnetic structures of individual extraterrestrial minerals and to constrain its formation environment, which was not unveiled by conventional paleomagnetic studies using a bulk mineral.

[1] Yuki Kimura et al., Nature Communications, 4 (2013) 2649.

[2] J. Bryson, et al., Earth and Planetary Science Letters, 388 (2014) 237.

Acknowledgment: This work was supported by a Grant-in-Aid for Challenging Exploratory Research from KAKENHI (16K13909).