Experiments on the element partitioning between olivine and aqueous chloride solution under supercritical conditions

Chiyoko Takahashi, Etsuo Uchida

Research output: Contribution to journalArticlepeer-review

Abstract

Experiments on the partitioning of Mg2+, Ca2+, Mn2+, Fe2+, Co2+, Ni2+ and Zn2+ between olivine (forsterite and fayalite) and 2N aqueous chloride solutions were performed in the temperature range of 500 to 800°C, 1 kb. The partition coefficient, which is defined as Kpn(Fo)=(XMe2sio4,/XMg2sio4)/(mMeCl°2aq/mMgCl°2q) or KPN(Fa)=(XmesiO4/XfesiO4)/(mMeCl°2aq/mFeCl°2aq), vs. ionic radius (PC-IR) diagrams are drawn based on the experimental results. In the case of forsterite, the PC-IR curve has a local maximum near Ni2+ and shows a concave curve in the region of larger ionic size. However Zn2+ deviates from such a trend. In the case of fayalite, the PC-IR curve shows a convex curve with a peak near Ni2+ except for 500°C. Also in this case, Zn2+ deviates from such a trend. The anomaly of Zn2+ may be attributable to its tetrahedral site preferency. The K pn value for Ni2+ decreases with increasing temperature, whereas those for the other elements except for Ca2+ increase. The optimum ionic radius for forsterite and fayalite seem to increase slightly with increasing temperature.

Original languageEnglish
Pages (from-to)85-96
Number of pages12
JournalJapanese Magazine of Mineralogical and Petrological Sciences
Volume29
Issue number3
DOIs
Publication statusPublished - 2000

Keywords

  • Aqueous chloride solution
  • Fayalite
  • Forsterite
  • Olivine
  • Partition coefficient
  • Supercritical condition

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Economic Geology

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