摘要
In dry silicate magmas equilibrated at or below FMQ buffer,sulfur is present mainly as S^(2-).The solution of sulfur can be represented by the reaction: FeO+(1/2)S_2=FeS+(1/2)O_2,assuming that activity of FeS in the coexisting sulfide liquid is close to unity,and that the activity of FeO in the silicate liquid fits the modified quasi-lattice melt model,a thermodynamical model for predicting solubility of sul- fur in dry silicate magmas has been established in this paper by fitting 147 experimentally determined sul- fur solubility data from literature.The following result is obtained:ΔH°=(158.718±3.970)J/mol, ΔS°=(33.361±2.682)J/K·mol,and ΔV°=(0.524±0.046)·10^(-5)J/Pa·mol.The model canbe used to predict solubility of sulfur,and to simulate sulfide liquid immiscibility in natural magmatic processes.
In dry silicate magmas equilibrated at or below FMQ buffer,sulfur is present mainly asS<sup>2-</sup>.The solution of sulfur can be represented by the reaction: FeO+（1/2）S<sub>2</sub>=FeS+（1/2）O<sub>2</sub>,assuming thatactivity of FeS in the coexisting sulfide liquid is close to unity,and that the activity of FeO in the silicateliquid fits the modified quasi-lattice melt model,a thermodynamical model for predicting solubility of sul-fur in dry silicate magmas has been established in this paper by fitting 147 experimentally determined sul-fur solubility data from literature.The following result is obtained:ΔH°=（158.718±3.970）J/mol,ΔS°=（33.361±2.682）J/K·mol,and ΔV°=（0.524±0.046）·10<sup>-5</sup>J/Pa·mol.The model canbe usedto predict solubility of sulfur,and to simulate sulfide liquid immiscibility in natural magmatic processes.
基金
the National Natural Science Foundation of China
