Nepheline Syenites from Pokrovo-Kyriyivo Massif (Azov Area, Ukraine)
UDC 552.331 (477.7)
https://doi.org/10.15407/mineraljournal.39.02.029
S.G. Kryvdik (1), V.V. Sharygin (2, 3), V.O. Gatsenko (1), E.S. Lunev (1), S.V. Kushnir (1)
(1) M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Av., Kyiv, Ukraine, 03680
E-mail: kryvdik@ukr.net, vera.gatsenko@ukr.net; lunev_00@ukr.net
(2) V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS
3, Acad. Koptyug av., Novosibirsk, Russia, 630090
(3) Novosibirsk State University 1, Pirogov St., Novosibirsk, Russia, 630090
E-mail: sharygin@igm.nsc.ru
Language: Ukrainian
Mineralogical journal 2017, 39 (2): 29-45
Abstract: Devonian Pokrovo-Kyriyivo massif is located at the junction of Azov megablock of the Ukrainian Shield and the folded structure of donbas. This massif is composed of subalkaline and alkaline rocks: pyroxenites, wehrlites, gabbroids, malignites, nepheline and pseudoleusite syenites and their dike analogues. Despite the fairly satisfactory knowledge of different rock types from the massif in the second half of the 20th century, the mineral composition of nepheline rocks — nepheline syenites (juvites) and malignites requires a more detailed study. We have published a series of articles, which present the results of mineralogical and petrological study of malignites from the Pokrovo-Kyriyivo massif. The object of the study in this article is the mineral and chemical composition of nepheline syenites (juvites) of the Pokrovo-Kyriyivo massif. The goal is the publication of new results of a detailed study of nepheline syenites of the Pokrovo-Kyriyivo massif and interpretation of the data. Research methods — chemical composition of minerals of nepheline syenites determined by the microprobe analysis using: Xray microanalyzer JXa733 (Jeol, Japan), the M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation (IGMOF) of the NAS of Ukraine and scanning electron microscope MIra 3 lMu (tescan ltd), equipped with a microanalysis system Inca energy 450 XMax80 (oxford Instruments ltd), the V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS. Material composition of rocks is defined by silicate analysis in the Chemical Laboratory IGMOF of the NAS of Ukraine. We have also involved previously published geochemical data obtained by ICP-MS. Conclusions. nepheline syenites from Pokrovo-Kyriyivo massif belong to juvites by their chemical features and the mineral composition. A set of rock forming minerals from juvites are corresponds to malignites. Amphiboles are the exception because they have not been revealed in juvites. The main features of malignite minerals are manifested to a greater or lesser extent in juvites. However, ferromagnesian minerals in juvites are more alkaline and enriched with iron in comparison with similar minerals from malignites. This, and high total mineral enrichment with iron in juvites, shows a greater degree of differentiation compared to malignites. Pyroxene, which is more enriched with iron, is presented by zonal phenocrysts, its core in them consists of aegirinesahlite and the shell consists of aegirine and fiberentangled units. The complex structure and diversity of pyroxene generations evidence for the change of conditions (temperature, fluid regime) in the process of juvite formation. that similarity is observed in malignites from the Pokrovo-Kyriyivo massif. The enrichment with Mn is typical of ferromagnesian minerals from alkaline complexes. The mica is the most enriched with MnO silicate from juvites. The composition of mica from juvites is formally corresponds to tetraferriannite, but they, like mica from malignites do not have the reverse absorption scheme. The high content of such incompatible elements as: Y, Nb, Zr, Ba, Sr, Rb, REE is typical of juvites. However the content of these elements in juvites is lesser, then in malignites that is not quite clear, taking into count that the former are more differentiated species compared with the latter. The REE euanomaly is inconsiderable in chondritenormalized spectra.
Keywords: Pokrovo-Kyriyivo massif, Azov area, nepheline syenite, juvite, aegirine, tetraferriannite, Ca-rinkite.
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