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

摘要: Experiments on the partitioning of Mg2+, Ca2+, Mn2+, Fe2+, Co2+, Ni2+ and Zn2+ between olivine (forsterite fayalite) 2 N aqueous chloride solutions were performed in temperature range 500 to 800°C, 1 kb. The partition coefficient, which is defined as KPN(Fo)=(XMe2SiO4/XMg2SiO4)/(mMeCl2°aq/mMgCl2°aq) or KPN(Fa)=(XMe2SiO4/XFe2SiO4)/(mMeCl2°aq/mFeCl2°aq), vs. ionic radius (PC-IR) diagrams are drawn based experimental results. In case forsterite, PC-IR curve has a local maximum near shows concave region larger size. However deviates from such trend. fayalite, convex with peak except for 500°C. Also this case, anomaly may be attributable its tetrahedral site preferency. KPN value decreases increasing temperature, whereas those other elements Ca2+ increase. optimum forsterite fayalite seem increase slightly temperature.