A new dyke rock from Pokrovo-Kyriyivo massif (Azov Sea area, Ukraine)
UDC 552.331 (477.7)
S.G. Kryvdik 1, V.V. Sharygin 2, 3, V.O. Gatsenko 1, E.S. Lunev 1
(1) M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
(2) V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS
3, Acad. Koptyug Ave., Novosibirsk, Russia, 630090
(3) Novosibirsk State University
1, Pirogov St., Novosibirsk-90, Russia, 630090
A new dyke rock from Pokrovo-Kyriyivo massif (Azov Sea AREA, Ukraine)
Mineralogical journal 2017, 39 (3): 53-66
Abstract: The new type of dyke rock was found in the Pokrovo-Kyriyivo massif (Azov Sea area, Ukraine). This dyke breaks through nepheline syenites (juvites). It is the first finding of dyke, which is older than nepheline syenites of this massif. The rock consists of K-feldspar, clinopyroxene, phlogopite, magnetite, ilmenite and calcite. Fluorapatite, titanite, sulphides (pyrite, chalcopyrite) and unidentified silicate (Sr-epidote?, 11—13 % wt. SrO) are minor or accessory. The phenocrystal clinopyroxene is magnesian salite with high content of TiO2 (4.8 wt. %) and Al2O3 (to 6.2 wt. %); phlogopite is rich in TiO2 (up to 9.7 wt. %) and BaO (up to 3.6 wt. %) and drastically differs in composition from micas of other alkaline rocks of Ukraine. The objective of this study is to describe the mineralogy, petrography and chemical composition features of the dyke rock, which was found within nepheline syenite (juvite) of the Pokrovo-Kyriyivo massif. Until now the nepheline syenite belonged to the latest (third) intrusive phase of the Pokrovo-Kyriyivo massif. The aim is publication of new data on detailed composition of the rock and their petrogenetic interpretation. Analytical methods are as follows: microprobe analysis of dyke minerals using a scanning electron microscope MIRA 3 LMU (Tescan Ltd), equipped with a microanalysis system INCA Energy 450 XMax-80 (Oxford Instruments Ltd) at the V.S. Sobolev Institute of Geology and Mineralogy SB RAS; bulk rock analysis in the Chemical laboratory at M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine. Conclusions: The studied dyke rock was unusual for the massif and is characterized by very specific features of the chemical and mineral composition in comparison with dykes of subalkaline gabbroids from the Pokrovo-Kyriyivo massif. In mineral composition and structure this rock can be formally attributed to Ca-saturated melanocratic shonkinite. On the SiO2 — (Na2O + K2O) diagram it is located in the melilitolite field. In chemical composition the rock is close to bergalite. The presence of calcite and high content of apatite indicate the similarity with alkaline-ultramafic rocks from carbonatite complexes. The appearance of this melanocratic dyke, which is younger than nepheline syenites (juvites), is the evidence of more complex sequence in formation of the Pokrovo-Kyriyivo massif. On the background of the dominant homodromous sequence of igneous rocks the antidromic ones can be locally manifested.
Keywords: Pokrovo-Kyriyivo massif, Azov Sea area, dyke, nepheline syenite, Ti-Ba-phlogopite, Ti-rich diopside-salite, antidromic rock sequence.
- Gonshakova, V.I. (ed.) (1973), Mafic-ultramafic magmatism and metallogeny of the East European Platform (platformal stage of evolution), Nedra, Moscow, RU, 296 p.
- Buturlinov, N.V. (1979), Magmatism of graben-like depressions in the south of the East European Platform in Phanerozoic, Abstract of D. Sc. dis., Kyiv, UA, 52 p.
- Gatsenko, V.O. and Lunev E.S. (2015), Kryvorizkiy Univ. Bulletin, No. 1 (33), Kryvyi Rih, UA, pp. 42-48.
- Gladkikh, V.S. 1972), Dokl. SSSR Acad. Sci., Vol. 203, No. 4, pp. 911-913
- Kryvdik, S.G. (2017), Mineral. Journ. (Ukraine), Vol. 39, No. 1, Kyiv, UA, pp. 84-99. https://doi.org/10.15407/mineraljournal.39.01.084
- Kryvdik, S.G. and Tkachuk, V.I. (1990), Petrology of alkaline rocks of the Ukrainian Shield, Nauk. dumka, Kyiv, UA, 408 p.
- Kryvdik, S.G., Mikhailov, V.A. and Sharygin, V.V. (2015), Mineral. Journ. (Ukraine), Vol. 37, No. 2, Kyiv, UA, pp. 46-62. https://doi.org/10.15407/mineraljournal.37.02.046
- Kryvdik, S.G., Gatsenko, V.O., Lunev, E.S., Vyshnevskyi, O.A. and Kanunikova, L.I. (2016), Mineral. Journ. (Ukraine), Vol. 38, No. 2, Kyiv, UA, pp. 52-71. https://doi.org/10.15407/mineraljournal.38.02.052
- Kryvdik, S.G., Sharygin, V.V., Gatsenko, V.O. and Lunev, E.S. (2016), Mineral. Journ. (Ukraine), Vol. 38, No. 3, Kyiv, UA, pp. 24-38. https://doi.org/10.15407/mineraljournal.38.03.024
- Kryvdik, S.G., Sharygin, V.V., Gatsenko, V.O. and Lunev, E.S. (2016), Geochemistry and ore formation, Is. 37, Kyiv, UA, pp. 3-14.
- Kryvdik, S.G., Sharygin, V.V., Gatsenko, V.O. and Lunev, E.S. (2017), Mineral. Journ. (Ukraine), Vol. 39, No. 2, Kyiv, UA, pp. 29-45. https://doi.org/10.15407/mineraljournal.39.02.029
- Kukharenko, A.A., Orlova, M.P. and Bagdasarov, E.A. 1969), Alkaline gabbroides from Karelia (Elet'ozerskyi massif - petrology, mineralogy, geochemistry), Leningrad gos. Univ. press, Leningrad, RU, 184 p.
- Lazarenko, E.K., Lavrinenko, L.F., Buchinskaya, N.I., Galiy, S.A., Voznyak, D.K., Galaburda, Yu.A., Zatsiha, B.V., Ivanova, A.V., Kvasnytsya, V.M., Kulchytska, G.O., Kuts, V.P., Melnikov, V.S., Pavlyshyn, V.I. and Turkevich, G.I. (1981), Mineralogy of Azov region, Nauk. dumka, Kyiv, UA, 432 p.
- Mitrokhin, A.V., Vishnevskaya, E.A., Gatsenko, V.O., Mitrokhina, T.V., Mihalchenko, I.I. and Sumlanskyy, L.V. (2016), Mineral. Journ. (Ukraine), Vol. 38, No. 1, Kyiv, UA, pp. 42-57.
- Siroshtan, R.I., Polovko, N.I., Kravchenko, G.L. and Spivak, S.D. (1975), Phlogopites of the Ukrainian Shield, Preprint In-t GMR the UkrSSR Acad. Sci., Kyiv, UA, 70 p.
- Sheremet, E.M., Kryvdik, S.G., Kozar, N.A., Strekozov, S.N., Vovkotrub, N.V., Setaya, L.D., Nikolaev, I.Yu., Agarkova, N.G., Dubina, A.V., Gatsenko, V.A. and Lunev, E.S. (2015), Phanerozoic magmatizm of Eastern Asov Area of Ukrainian Shield and related commercial minerals (petrology, geochemistry and ore potential), Comprint, Kyiv, UA, 317 p.
- Sharygin, V.V. and Kryvdik, S.G. (2017), Mineral. Journ. (Ukraine), Vol. 39, No. 1, Kyiv, UA, pp. 19-35. https://doi.org/10.15407/mineraljournal.39.01.019
- Shramenko, I.F., Stadnik, V.A. and Osadchiy, V.K. (1992), Geokhimiya karbonatitov Ukrainskogo shchita, Nauk. dumka, Kyiv, UA, 212 p.
- Chelyschev, N.F. (1970), Ontogenetic research methods of minerals, Nauka, Moscow, RU, pp. 77-80.