Experimental studies on ion exchange equilibria between minerals and aqueous chloride solution in the system CaWO4-FeWO4-MnWO4 under supercritical condition

Etsuo Uchida, Masataka Gima, Naoya Imai, Junichi Sugihara

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Ion exchange experiments in the system CaWO4-FeWO4-MnWO4-(Ca, Fe2+, Mn2+)Cl2-H2O, corresponding to scheelite-ferberite-huebnerite series mineral as solid phase, were carried out at 400 and 600°C under 1000 kg/cm2. Ferberite and huebnerite form a continuous solid solution (wolframite ss), which may exhibit thermodynamically ideal behavior. Also, ferrous ion tends to concentrate preferably into wolframite ss than into aqueous chloride solution. This tendency becomes more pronounced with decreasing temperature. Scheelite and wolframite ss do not dissolve into each other essentially, but form a wide miscibility gap. The Ca/(Ca+Fe2++Mn2+) mole ratios of aqueous chloride solution coexisting with both minerals are about 0.65 at 400°C and 0.3 at 600°C. Temperature has a significant effect on the mole ratio, although a slight variation due to the compositional change of wolframite ss is recognized. The present experimental results cast a doubt on “wolframite geothermometer”.

本文言語English
ページ(範囲)339-347
ページ数9
ジャーナルGEOCHEMICAL JOURNAL
23
6
DOI
出版ステータスPublished - 1989

ASJC Scopus subject areas

  • 地球物理学
  • 地球化学および岩石学

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