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Тезисы международной конференции

Рудный потенциал щелочного, кимберлитового

 и карбонатитового магматизма

Abstracts of International conference

Ore potential of alkaline, kimberlite

and carbonatite magmatism

Geochemical peculiarities of Chernigovka carbonatitic massif (Ukraine, Azov area)

 Kryvdik S.G.*, Dubyna A.V.*, Kogarko L.N.**

*N.P. Semenenko Institute of geochemistry, mineralogy and ore formation NAS of Ukraine, Kyiv, Ukraine


**V.I. Vinogradov Institute geochemistry and analytical chemistry RAN



Chernigovka (Novo-Poltavka) carbonatitic massif in ​​Azov area is considered one of the most studied in the mineralogical and petrological aspects. However, many questions of geochemistry and formation conditions of this massif remain unclear. Although in general massif has a typical rock suite (alkaline pyroxenites, ijolite-melteigites, nepheline and alkaline syenites, carbonatites, fenites), it has an "anomalous" features of the chemical composition of carbonatites and alkaline rocks [1, 6]. The ICP MS data obtained in recent years, as well as analysis of the results of previous researchers [5, 8] allowed identifying some geochemical features of the Chernigovka massif that distinguish it from other carbonatitic complexes.

In the early calcite carbonatites (sovites) of this massif is often fixed a quite high Ta content (200 ppm) relative to Nb (Nb/Ta ratio about 3,9-6,9). In earlier publications [5, 8], there are analyzes of carbonatites with Nb/Ta up to 6,6, in rare cases - 3.6. In Malosayan massif have been also reported carbonatites with the Nb/Ta ratio - 2,7-4,5 at 422 ppm Ta [7].

A higher Ta content (262 ppm) was recorded in the biotite-albite nepheline syenite (canadite) with the Nb/Ta ratio to 3,9. Lower Nb/Ta ratio (2,8) at 421 Nb ppm and 152 ppm Ta content was found in the apatite-magnetite foskorites of this massif. At the same time in the later calcite-dolomite and significantly dolomite (ankerite) carbonatites of Chernigovka massif Nb/Ta ratio is quite high (28-38), i.e. customary for the carbonatites.

Such discriminate Nb/Ta from the different rock types of this massif are due to a different mineral forms of these elements. In sovites among the main niobates hatchettolite with Nb/Ta ratio 2,5-3,0 is typically or predominant. Therewith in this mineral is quite high, but not characteristic for typical carbonatites, uranium content (9-12% U3O8) [2, 4]. Probably observed in kanadites minerals of the pyrochlore group also belongs to hatchettolite.

In beforsites mainly niobates are columbite and cerium fergusonite by subordinate role of conventional pyrochlore.

Several unusual in this massif are nepheline syenites - canadites (nepheline + albite + biotite ± microcline). Except mentioned increased or high Nb and Ta concentrations (low Nb/Ta) there is a high content of Zr (0,1-0,3%). In comparition to more melanocratic rocks of the massif - alkaline pyroxenes and ijolite-melteigites, kanadites are characterized significantly more Zr content, and as much or even more Nb, but lower REE and Y. In overwhelming majority of the well-known carbonatitic complexes nepheline syenite are depleted in REE, Zr, Nb and Ta in comparison with the earlier melanocratic rocks (jakupirangites, ijolite-melteigites, melilitites).

In addition, nepheline from nepheline syenites and melteigites are more sodium than in the most similar of alkaline rocks [3].

These geochemical and others (petrological, mineralogical) features of Chernigovka carbonatitic massif that distinguish it from most of the known carbonatitic complexes, are due to by abyssal conditions of its formation. This massif belongs to one of their most deep eroded [1, 6]. Abyssal conditions of its formation are reflected in the untypical distribution of rare earths (Nb, Ta, Zr, Hf, TR, Y) between the silicate and carbonatitic differentiates, that confirm by experimental data [9].


1.    Glevassky E.B., Kryvdik S.G. Precambrian carbonatitic complex of Azov area. Kyiv: Naukova Dumka, 1981. 228 p. (in Rassia)

2.    Kapustin U.L., Lapitsky E.M., Pogrebnoy V.T. et al. Carbonatite zone of the Ucrainian Shield. Sovet. Geol. 1977. №9. P. 80-92. (in Rassia)

3.    Kononova V.A. Jacupirangite-urtite series of alkaline rocks. Moscow: Nauka, 1976. 214 p. (in Rassia)

4.    Kryvdik S.G., Tkachuk V.I. Petrology of alkaline rocks of the Ukrainian Shield. Kyiv. Naukova Dumka, 1992. 212 p. (in Rassia)

5.    Rare elements of the Ukrainian Shield. Kyiv. Naukova dumka, 1986. 256 p. (in Rassia)

6.    Ryabchikov I.D., Kogarko L.N., Krivdik S.G., Ntaflos T. Formation conditions of carbonatites of Chernigovka massif (Azov area, Ukraine) // Geol. ore depos. 2008. v.50. №6. P. 483-493. (in Rassia)

7.    Samoylov V.S. Geochemistry of  carbonatites. Moscow: Nauka, 1984. 193 p. (in Rassia)

8.    Shramenko I.F., Stadnik V.A., Osadchiy V.K. Geochemistry carbonatites of the Ukrainian Shield. Kyiv: Naukova Dumka, 1992. 212 p. (in Rassia)

9.    Bell K. Carbonatites – Genesis and Evolution. Boston, Mass, Unwin Hyman Ltd., 618 p.