Synthetic carbonatite magmas are represented by in the system CaO-CO_2H_2O (Wyllie and Tuttle, 1960), and the relation between carbonatites and magmas has been investigated by addition of components (e.g., Wyllie, 1966, 1978). We are determining the phase relations in a. series systems involving CaO-CaF_2-La(OH)_3-CO_2-H_2O other components in an effort to delineate the for the precipitation of rare earth carbonates fluocarbonates (bastnaesite-type minerals) synthetic carbonatite magmas. As a supplement the construction of phase diagrams in systems characterized limited numbers of com portents, we have a more complex bulk composition which we approximates that of the Sulphide Queen carbonatite Mountain Pass, California-prior to crystallization.
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Jones et al. (1983) studied this question.