REE, Y, Sc, and Li Partition between Aluminosilicate and Aluminofluoride Melts, Depending on Pressure and Water Content in the Model Granite System

Shchekina, T.I.; Rusak, A.A.; Alferyeva, Y.O.; Gramenitskiy, E.N.; Kotelnikov, A.R.; Zinovieva, N.G.; Bychkov, A.Y.; Bychkova, Y.V.; Khvostikov, V.A.

Авторы: Shchekina T.I., Rusak A.A., Alferyeva Ya O., Gramenitskiy E.N., Kotelnikov A.R., Zinovieva N.G., Bychkov A.Yu, Bychkova Ya V., Khvostikov V.A.
Журнал: Geochemistry International
Том: 58
Номер: 4
Год издания: 2020
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 391
Последняя страница: 407
DOI: 10.1134/S0016702920040102
Аннотация: 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 % H2O, show thatall REE, Y, Sc, and Li are preferably distributed into the aluminofluoride melt, regardless of the experimentalconditions. The partition coefficients of the elements Kd REE = CREE(LF)/CREE (L) between these phases depend onpressure. The first data are obtained indicating that a pressure increase from 1 to 2 kbar at a temperature of800°C leads to a significant decrease in Kd REE. The partition coefficients between the melts monotonouslydecrease from LREE to HREE at both 1 and 2 kbar. No clear relationships were found between Kd REE and thewater 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 Scenrichment in the salt melts. All of the experiments show a positive correlation between the partition coefficientsKd Li and Kd REE, Y, Sc between the salt and silicate melts. The dependence of this REE behavior on pressure inthe system may be explained by a change in the structure of silicate and salt melts when H2O and F are dissolvedin them and by complexation under various experimental conditions.
Добавил в систему: Русак Александра Андреевна

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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 Systemстатья

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