R7: 岩石・鉱物・鉱床一般 (資源地質学会共催セッション)

[R7P-08] 沖縄トラフ熱水鉱床に産するisocubaniteの磁気特性

*加藤 千恵¹、大野 正夫¹、桑原 義博¹、畠山 唯達²、山田 康洋³、戸塚 修平⁴、島田 和彦⁴、石橋 純一郎⁴、長瀬 敏郎⁵ (1. 九大比文、2. 岡山理大、3. 東京理大、4. 九大理、5. 東北大博物館)

キーワード：アイトキューバナイト、低温磁気測定、メスバウア分光分析、海底熱水鉱床

We conducted low-temperature magnetometry and Mössbauer spectroscopy on isocubanite collected from hydrothermal deposits in the Okinawa Trough, and isocubanite synthesized by heating a cubanite crystal. Samples undergo a magnetic transition at ~100 K, but the magnetization intensity differed by 50 times. The Mössbauer spectra indicate that the ‘synthesized’ isocubanite suffered the effects of disorder, while the spectra of a chimney sample are consistent with those of chalcopyrite and two iron sites in the ‘Cu_1-εFe_3+εS₄’ phase reported by Wintenberger et al. (1994).