The paper presents petrochemical, geochemical, and mineralogical data on rocks of the phoscorite–carbonatite complex in the Kovdor alkaline–ultramafic massif, Kola Peninsula, Russia. In contrast to what is usually thought, trace elements were determined to be concentrated not in the carbonatites themselves but in the related phoscorites. The paper presents data on the evolution of the compositions and zoning of minerals in successive generations of both rock types as a result of the fractional crystallization of their parental magmas, and data on general trends in the concentrations of trace elements. The Fe-rich phosphate–carbonate melt seems to have separated from the primitive alkaline–ultramafic silicate melt during its advanced differentiation. The Fe-rich phosphate–carbonate magma was parental for the phoscorite–carbonatite complex. The possibility of its splitting into immiscible Fe-rich phosphate and carbonatite melts is discussed.

中文翻译：

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磷硬质岩和碳酸岩：关系、可能的成岩过程和母岩浆，参考科拉半岛 Kovdor 地块

该论文提供了俄罗斯科拉半岛 Kovdor 碱性-超镁铁质地块中亚磷铁矿-碳酸岩复合体岩石的石油化学、地球化学和矿物学数据。与通常认为的相反，微量元素被确定不是集中在碳酸岩本身中，而是集中在相关的亚磷酸酯中。本文提供了由于母岩浆分步结晶导致两种岩石类型的连续世代中矿物成分和分带演变的数据，以及微量元素浓度总体趋势的数据。富铁磷酸盐-碳酸盐熔体似乎在其高级分化过程中与原始碱性-超镁性硅酸盐熔体分离。富含铁的磷酸盐-碳酸盐岩浆是亚磷铁矿-碳酸岩复合体的母体。