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REE, Y, Sc, and Li Partition between Aluminosilicate and Aluminofluoride Melts, Depending on Pressure and Water Content in the Model Granite System
Geochemistry International ( IF 0.7 ) Pub Date : 2020-04-01 , DOI: 10.1134/s0016702920040102
T. I. Shchekina , A. A. Rusak , Ya. O. Alferyeva , E. N. Gramenitskiy , A. R. Kotelnikov , N. G. Zinovieva , A. Yu. Bychkov , Ya. V. Bychkova , V. A. Khvostikov

Abstract— Experiments on REE, Y, Sc, and Li partition between aluminosilicate ( L ) and aluminofluoride ( LF ) melts in the granite system at 800°C and 1, 2 kbar, containing up to 18 wt % F and 2 to 13 wt % H 2 O, show that all REE, Y, Sc, and Li are preferably distributed into the aluminofluoride melt, regardless of the experimental conditions. The partition coefficients of the elements K d REE = $$C_{{{\text{REE}}}}^{{LF}}$$ / $$C_{{{\text{REE}}}}^{L}$$ between these phases depend on pressure. The first data are obtained indicating that a pressure increase from 1 to 2 kbar at a temperature of 800°C leads to a significant decrease in K d REE . The partition coefficients between the melts monotonously decrease from LREE to HREE at both 1 and 2 kbar. No clear relationships were found between K d REE and the water concentration in the system. It is shown that Li strongly impacts the distribution of REE, Y and Sc, because Li, similar to F, causes the onset of liquid immiscibility in the system and facilitates REE, Y, and Sc enrichment in the salt melts. All of the experiments show a positive correlation between the partition coefficients K d Li and K d REE, Y, Sc between the salt and silicate melts. The dependence of this REE behavior on pressure in the system may be explained by a change in the structure of silicate and salt melts when H 2 O and F are dissolved in them and by complexation under various experimental conditions.

中文翻译:

硅铝酸盐和氟化铝熔体之间的 REE、Y、Sc 和 Li 分配,取决于模型花岗岩系统中的压力和水含量

摘要——在 800°C 和 1, 2 kbar 条件下,花岗岩系统中铝硅酸盐 ( L ) 和氟化铝 ( LF ) 熔体之间的 REE、Y、Sc 和 Li 分配实验,其中 F 含量高达 18 wt%,F 含量高达 2 至 13 wt% % H 2 O 表明,无论实验条件如何,所有 REE、Y、Sc 和 Li 均优选分布到氟化铝熔体中。元素的分配系数 K d REE = $$C_{{{\text{REE}}}}^{{LF}}$$ / $$C_{{{\text{REE}}}}^{L这些阶段之间的 }$$ 取决于压力。获得的第一个数据表明,在 800°C 的温度下,压力从 1 kbar 增加到 2 kbar 会导致 K d REE 显着降低。在 1 kbar 和 2 kbar 下,熔体之间的分配系数从 LREE 到 HREE 单调递减。未发现 K d REE 与系统中的水浓度之间存在明确的关系。结果表明,Li 强烈影响 REE、Y 和 Sc 的分布,因为 Li 与 F 相似,会导致系统中液体不混溶的开始,并促进盐熔体中 REE、Y 和 Sc 的富集。所有的实验都表明盐和硅酸盐熔体之间的分配系数 K d Li 和 K d REE、Y、Sc 之间呈正相关。这种 REE 行为对系统压力的依赖性可以通过当 H 2 O 和 F 溶解在硅酸盐和盐熔体中时的结构变化以及在各种实验条件下络合来解释。所有的实验都表明盐和硅酸盐熔体之间的分配系数 K d Li 和 K d REE、Y、Sc 之间呈正相关。这种 REE 行为对系统压力的依赖性可以通过当 H 2 O 和 F 溶解在硅酸盐和盐熔体中时结构的变化以及在各种实验条件下的络合来解释。所有的实验都表明盐和硅酸盐熔体之间的分配系数 K d Li 和 K d REE、Y、Sc 之间呈正相关。这种 REE 行为对系统压力的依赖性可以通过当 H 2 O 和 F 溶解在硅酸盐和盐熔体中时结构的变化以及在各种实验条件下的络合来解释。
更新日期:2020-04-01
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