ケイ酸塩単結晶を用いた古地磁気強度測定
キーワード：古地磁気学、古地磁気強度
2016.02.

アイスランド溶岩から解明する約1200-1300万年前の期間の古地磁気準連続変動
2023.04～2025.03, 代表者：山本　裕二, 高知大学.

深成岩・単結晶を用いた１０００万年スケールの地球磁場強度変動の復元
2023.04～2028.03, 代表者：加藤　千恵, 九州大学, 九州大学.

考古地磁気年代推定法の東アジアへの展開：過去3500年間の新たな連続指標の確立
2020.04～2024.03, 代表者：大野　正夫, 九州大学.

海洋底拡大を陸上で探る：エチオピア・アファール地域での無人飛行機による磁気探査
2020.10～2024.03, 代表者：石川　尚人, 富山大学.

磁気学的・鉱物学的手法による土器焼成環境の解明 ―鉄・酸素の挙動から―
2021.04～2024.03, 代表者：畠山　唯達, 岡山理科大学.

主要原著論文

1.	Chie Kato, Masao Ohno, Tadahiro Hatakeyama, Yasuhiro Yamada, Fuminori Honda, Kazuhiko Shimada, Toshiro Nagase, Shuhei Totsuka-Shiiki, Yoshihiro Kuwahara, Jun-ichiro Ishibashi, Low-temperature magnetic behavior of isocubanite from seafloor hydrothermal deposits in the Okinawa Trough, Physics and Chemistry of Minerals, https://doi.org/10.1007/s00269-023-01264-3, 51, 5, 2024.02, The characteristic behavior of magnetic remanence correlated with mineralogical textures and composition was observed using low-temperature magnetometry, microscopy, and chemical analysis of three isocubanite samples collected from hydrothermal deposits in the Okinawa Trough and a sample transformed from natural cubanite via heating. Both zero-field remanence acquired at 5 K and field cooling remanence acquired at 300–5 K of all samples sharply decreased with increasing temperature at approximately 100 K. In addition, low-temperature cycling of isothermal remanence at 300 K exhibited a transition at approximately 100 K; remanence increased with decreasing temperature and vice versa. The intensity of remanence at low temperature and sharpness of the transition varied across samples with different compositions and microscopic textures, that is, the presence or absence of chalcopyrite lamellae and their widths. The sample obtained from a hydrothermal chimney, in which the magnetic transition was most clearly observed, was also subjected to X-ray diffraction, Mössbauer spectroscopy, electrical resistivity, and magnetic hysteresis measurements. The obtained results were generally consistent with those reported previously for unnamed mineral CuFe3S4 with an ordered cation arrangement. The low-temperature magnetic behavior of isocubanite possibly depends on the degree of cation ordering and can be regarded as an indicator of chemical composition and cooling history. Therefore, low-temperature magnetometry is useful for the detection of isocubanite and a potentially powerful technique for the prompt estimation of its composition and texture, contributing to our understanding of the formation process of hydrothermal deposits..
2.	Chie Kato, Masahiko Sato, Yuhji Yamamoto, Hideo Tsunakawa, Joseph L. Kirschvink, Paleomagnetic studies on single crystals separated from the middle Cretaceous Iritono granite, EARTH PLANETS AND SPACE, 10.1186/s40623-018-0945-y, 70, 2018.11.
3.	Chie Kato, Koichiro Umemoto, Kenji Ohta, Shoh Tagawa, Kei Hirose, Yasuo Ohishi, Stability of fcc phase FeH to 137 GPa, AMERICAN MINERALOGIST, 10.2138/am-2020-7153, 105, 6, 917-921, 2020.06.

主要総説, 論評, 解説, 書評, 報告書等

1.

Chie Kato, Yoichi Usui, Masahiko Sato , A brief review of single silicate crystal paleointensity: rock-magnetic characteristics, mineralogical backgrounds, methods and applications, Earth, Planets and Space, https://doi.org/10.1186/s40623-024-01994-w, 2024.03, Single silicate crystals hosting tiny magnetic inclusions are remarkable targets to study the paleointensities of the Earth and extraterrestrial samples. Since the pioneering work done in late 1990s, paleointensity studies using various silicate minerals such as feldspar, quartz, zircon, pyroxene, and olivine with magnetic inclusions trapped during grain growth or exsolved from the host phase have been reported. It has been shown that some single crystals have the ability to record paleomagnetic information as reliable or more reliable than the whole rock, by direct comparison of the obtained paleointensity estimate from single crystal and the whole-rock sample or the magnetic observatory data. Various rock-magnetic studies also support the fidelity of these crystals. Here, we provide a brief review of the rock-magnetic characteristics of the single crystals, the mineralogical background of the hosting silicates, and experimental procedures developed to obtain reliable data from magnetically weak samples with distinctive rock-magnetic features. We also overview the studies on paleointensity and related topics on various terrestrial and extraterrestrial samples published mainly after the comprehensive reviews in late 2000s. The present review covers the advantages as well as the limitations and caveats of paleointensity studies using single crystal samples and will help readers who wish to utilize this technique in their research..

主要学会発表等

所属学会名

学会大会・会議・シンポジウム等における役割

学術論文等の審査

海外渡航状況, 海外での教育研究歴