Experimental determination of partition coefficients of ten rare earth elements and barium between clinopyroxene and liquid in the synthetic silicate system at 20 kilobar pressure |
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| Authors: | Akimasa Masuda Ikuo Kushiro |
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| Institution: | (1) Department of Chemistry, Science University of Tokyo, Kagurazaka, 162 Tokyo, Japan;(2) Geological Institute, University of Tokyo, Hongo, 113 Tokyo, Japan |
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| Abstract: | Two experiments were carried out at 20 kb pressure for the measurement of partition coefficients of ten lanthanides and barium between diopside clinopyroxene and liquid in the synthetic system diopside-enstatite-silica-H2O. Starting materials are glass of two different compositions CaMgSi2O6 56, MgSiO3 14, SiO2 30 weight % and CaMgSi2O6 80, MgSiO3 20 weight %.In the experiment on the former composition, the partition coefficient increases regularly with decrease of ionic radii from La to Dy and decreases also regularly from Dy to Lu. In the experiment on the latter composition, stepwise shift of partition coefficient was observed between Dy and Er.The results suggest that the lanthanide cations occupy the site of 8-fold coordination in the clinopyroxene and that the partition coefficients depend on the ionic radii of lanthanide elements and also on the chemical composition of the starting material or heating process during the run. |
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