MINERALOGICAL AND PETROGRAPHIC PECULIARITIES OF MALIGNITES OF THE POKROVO-KYRIYIVO MASSIF (AZOV SEA AREA, UKRAINE)

UDC 552.331 (477.7)

https://doi.org/10.15407/mineraljournal.38.02.052

S.G. Kryvdik, V.O. Gatsenko, E.S. Lunev, O.A. Vyshnevskyi, L.I. Kanunikova

M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680

Е-mail: kryvdik@ukr.net, vera.gatsenko@ukr.net; lunev_00@ukr.net; vyshnevskyy@i.ua; kanunikova@gmail.com

MINERALOGICAL AND PETROGRAPHIC PECULIARITIES OF MALIGNITES OF THE POKROVO-KYRIYIVO MASSIF (AZOV SEA AREA, UKRAINE)

Language: Ukrainian

Mineralogical journal 2016, 38 (2): 52-71

Abstract: The goal of this article is mineralogy and petrology of malignites, which are main alkaline (agpaitic) rocks of the Pokrovo-Kyriyivo massif in the Azov megablock, Ukrainian Shield. These rocks consist of nepheline, K-feldspar, alkaline pyroxene, Ca-Na amphibole, phlogopite, Ca-rinkite and titanite. Sometimes malignites contain phlogopite-rich xenoliths. Chemical composition of rock-forming and some accessory minerals in malignites and their xenoliths was firstly determined by microprobe analysis. Almost all minerals in malignites are poikilitic, and abundant nepheline inclusions are common to K-feldspar, phlogopite, amphibole and Ca-rinkite. Pyroxene in malignite occurs as phenocrysts and microlites. The central part in phenocrysts is presented by diopside, whereas the outer part of phenocrysts and microlites belongs to the hedenbergite — diopside-aegirine series. Amphibole from xenoliths is related to Mg-richterite, and that from malignites belongs to the richterite-riebeckite-arfvedsonite series. Mica of malignites is low-alumina (K > Al) phlogopite, whereas mineral from xenoliths is tetraferriphlogopite. Nepheline includes elevated contents of FeO (up to 2.6 wt. %), assuming high amount of the hypothetical end-member NaFe3+SiO4. Magnetite in malignites is rich in MnO (up to 6.6 wt. %) and TiO2 (up to 18.9 wt. %); magnetite from xenoliths contains Cr2O3 (up to 4 wt. %). These chemical features of minerals are determined by high temperature of rock formation and agpaitic evolution trend of the alkali syenite (malignite) melt.

Keywords: malignite, nepheline, alkali pyroxene, Ca-Na amphiboles, phlogopite, Ca-rinkite.

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