Kryvdik S.G.1, Dubyna О.V.1,2
1 – M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Science of Ukraine
2 – Institute of Geology Taras Shevchenko National University of Kyiv
Language: Ukrainian
Geochemistry and ore formation 2018, 39: 100-107
https://doi.org/10.15407/gof.2018.39.100
The concentration of phosphorus in various types of the nepheline and alkaline syenites in the Ukrainian shield is determined by relation of these rocks to the alkaline-ultrabasic (carbonatite) or gabbro-syenitic complexes. In addition, in each particular type of syienites phosphorus content depends on the degree of their differentiation. The final differentiates, aegirine and ribeckite syenites and agpaitic nepheline syenitis are always depleted in P2O5, and thus in such rocks britholite often crystallizes instead of apatite (as it’s silicate analogue). A positive correlation was found between the content of phosphorus (P2O5) and iron (FeO + Fe2O3), as well as between P2O5 and TiO2 in the syenites of the gabbro-syenitic complexes. The geochemical behavior of phosphorus and the chemistry of femic minerals (mafic index, alkalinity) can be the criteria for their petrogenesis and the evaluation of their ore ability.
Keywords: phosphorus, nepheline syenites, alkaline syenites, rock complexes, apatite.
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