Partition coefficient of Ca among leucite, sanidine, silicic-sanidinic melt, and hydrothermal solution at 2Kb and high temperatures (920º and 1030ºC)

Abstract

Results of synthesis experiments of leucite (Lc), sanidine (San) and fused sanidine, the latter with slightly excess SiO2 are reported. Starting materiais were amorphous oxide gels with the appropriate stoichiometric compositions in contact with KCl hydrothermal solutions (HS) containing variable amounts of tagged CaCl2(45Ca) at pressures of 2 kbars and temperatures of 930º and 1030ºC. The distribution coefficients ; were obtained from the Ca/K ratios measured in both ideal synthesized materiais and solutions. The results were as follows: ; and ;