Gadolinium: Distribution between Aqueous and Silicate Phases

Robert L. Cullers, L. Gordon Medaris, Larry A. Haskin

doi:10.1126/science.169.3945.580

Gadolinium: Distribution between Aqueous and Silicate Phases

DOI Web Site 被引用文献1件

Robert L. Cullers

Department of Geology, University of Wisconsin, Madison 53706
L. Gordon Medaris

Department of Geology, University of Wisconsin, Madison 53706
Larry A. Haskin

Department of Chemistry, University of Wisconsin, Madison

書誌事項

公開日: 1970-08-07

DOI

10.1126/science.169.3945.580

公開者: American Association for the Advancement of Science (AAAS)

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説明

<jats:p>Studies of the partition of trivalent gadolinium between aqueous and silicate phases have been made at temperatures from 800° to 900°C and at pressures from 500 to 1000 bars. Constant values for the distribution coefficients for forsterite, enstatite, and diopside were obtained over a concentration range from 0.6 part per billion to 4 parts per thousand in the solid phases. Ratios of silicate crystal-aqueous phase distribution coefficients to silicate melt-aqueous phase distribution coefficients are close to the values for silicate crystal-silicate melt distribution coefficients estimated from natural systems. The free ion activity of trivalent gadolinium in the silicate melts appears to be less than one-hundredth of its value for aqueous phases of the same concentration.</jats:p>