O.V. Dubyna. Petrological and Geochemical Features of the Azov Sea Area Carbonatites (Ukraine)

UDC 550.4 (477)
O.V. Dubyna
Taras Shevchenko Kyiv National University. Educational-scientific institute "Institute of Geology"
90, Vasylkivska Str., Kyiv, Ukraine, 03022
M.P. Semenenko Institute of Geochemistry,Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: dubyna_a@ukr.net
Mineralogical journal 2018, 40 (1): 53-78
Abstract: The geochemical features carbonatites in the spatial association with gabbro-sienitic and alkaline-ultrabasic magmatic complexes or forming separate small vein or dike-like body of the Azov Sea area are considered. Most varieties are presented by calcite carbonatites, but both calcite-dolomite and calcite carbonatites are known in Chernigivka complex. Carbonatites are characterized by high Sr concentration, by decreasing Ba, and REE, low Ti, Zr, Hf, that is consistent with the average values for the Ca-carbonatites. Compared to carbonatites from other complexes of the Azov Sea area in the Chernigivka complex carbonatites are more enriched with phosphorus, Nb and Ta REE at high U/Th. Chondrite-normalized patterns are characterized by significant enrichment of LREE, without negative or with slightly negative Eu-anomaly (Eu* 0.74-1.04). Data on geochemistry of stable and Sr isotopes evidence for the abyssal nature of carbonatite magmas. The fairly narrow range of δC13 variation is typical of the Azov Sea area carbonatites that corresponds to the depth values, while δ18O can vary significantly, going beyond the scopes of typical carbonatitic values. Sometimes, this is connected with the presence, alongside with typical carbonatites, of carbonate veins of hydrothermal-metasomatic genesis, and sometimes with carbonatites interaction with meteoric and metamorphogrnic waters. In the Chernigivka carbonatite complex the significant variations of δ18O may be determined by different depth their erosion cross-cut and/or by thermal dissociation of rock-forming carbonates. The presented data indicate that carbonatites of different complexes can be formed as a result of different petrogenetical processes generation and further differentiation of initial magmatic melt. The calcite carbonatites of the Chernigivka complex and Khlibodarivka quarry may appear as a result of a primary dolomite carbonatitic melt crystallization or liquation carbonatitic and silicate melt from primary CO2-enriched silicate melt. Such ways of formation are also admitted for the Petrivsko-Gnutivsky carbonatite occurrence. The dolomitic and kimberlitic carbonatites are very similar to primitive carbonatitic melts formed by negligible partial melting of CO2-enriched mantle peridotite. Geochemical features of carbonatites from the gabbro-syenitic complexes of the Azov Sea area are more consistened with their liquation genesis.
Keywords: carbonatites, alkaline rocks, the Azov block, liquation, rare-earth elements, rare elements, the Ukrainian Shield.

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