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  • 1 The University of Tokyo Graduate School of Arts and Sciences 3-8-1 Komaba Meguro-ku, Tokyo 153-8902 Japan
  • | 2 The University of Tokyo Graduate School of Arts and Sciences 3-8-1 Komaba Meguro, Tokyo 153-8902 Japan
  • | 3 Chinese Academy of Sciences Lanzhou Institute of Geology 324 West Donggang Road Lanzhou 730000 China
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Abstract  

57Fe Mössbauer spectroscopy has been applied to the ultramafic rocks collected from the Jinchuan nickel deposit in China to elucidate their mineralization process. Their Mössbauer spectra consisted of two sextets ascribable to magnetite, two doublets ascribable to Fe2+ and Fe3+ in chromite, and one doublet ascribable to olivine. The closest sample to the ore body did not contain chromite and contained a doublet ascribable to pyrite and a sextet ascribable to pyrrhotite. The valence and site distribution of iron species suggested low oxygen fugacity for the formation of the Jinchuan nickel deposit.