Experimental investigation reveals loparite solubility depends on melt composition in alkaline aluminosilicate melts, highlighting geochemical controls on rare earth element partitioning.
The solubility of loparite (Na, Ce, Ca)2(Ti, Nb)2O6) in aluminosilicate melts of various compositions was experimentally studied at T = 1200 and 1000°C and P = 2 kbar under dry conditions and in the presence of 10 wt. % H2O in a high gas pressure vessel with a duration of 1 day. The initial material was previously melted glasses of malignite, urtite and eutectic albite-nepheline composition, as well as natural loparite of the Lovozero massif. The dependence of the solubility of loparite on the composition of the aluminosilicate melt (Ca/(Na + K), (Na + K)/Al) has been revealed. Partition coefficients of a number of elements (Ti, Nb, Sr, REE) between silicate melt and loparite crystals (Ki = Cimelt/Cilop) were estimated.
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Сук et al. (2024) studied this question.
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