Geochemical Characteristic and Geodynamic Condition of Metabasites and Metakomatiites of Kryvbass (Middle-Dnieper Megablock of the Ukrainian Shield)

UDC 550.4 : 552.4 (477)

https://doi.org/10.15407/mineraljournal.37.02.076

G.V. Artemenko (1), I.A. Samborskaya (1), A.V. Martynyuk (2)

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

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

E-mail: regul@igmof.gov.ua; irena.samborska@gmail.com

(2) Kryvyi Rih KGR, KP "Yuzhukrgeologiya"

11, Chernyshevskogo Str., Dnipropetrovs’k, Ukraine, 49000

E-mail: pravobereg@rambler.ru

Geochemical Characteristic and Geodynamic Condition of Metabasites and Metakomatiites of Kryvbass (Middle-Dnieper Megablock of the Ukrainian Shield)

Language: Russian

Mineralogical journal 2015, 37 (2): 76-89

Abstract: The problem of the age of Kryvbass metabasite thickness was considered by many researchers, but so far, this problem has not been solved completely. Throughout the structure the contact of metabasite thickness and Saxagan plagiogranites is tectonic, the epigenetic hydrothermal-metasomatic processes of amphibolization, silicification, carbonation, chloritization, sulphidation, epidotization of host rocks being manifested within it, and this makes its unambiguous interpretation very difficult. Metabasic thickness of the Kryvyi Rih-Kremenchug area is attributed by some researchers to the Paleoproterozoic rift platform formations, and others — are compared with metabasites of the Archean greenstone structures of the Middle-Dnieper megablock. The aim is geochemical study of metabasites and metakomatiites of the East-Hannivka zone and Saxagan area of Kryvbass and possible geodynamic conditions of their formation, evaluation of changes in the composition of REE during metamorphism of rocks of metabasite thickness. To identify the geodynamic conditions of formation of mafic rocks the authors used techniques developed on the use of the group of rare-earth elements, transitional and highcharge elements which are not responsive to changes in processes and fractional crystallization of rocks. In the East-Hannivka zone we have studied metakomatiites (peridotite and basalt) and tholeiitic metabasalts (Mg and high-iron). Peridotite metakomatiites have a somewhat greater content of REE, Cr, Ni, HFS elements (Y, Nb, Ta, Zr), than in Vysokopillya GS wan. As to geochemical characteristics they are comparable to volcanics of KT formation of a lower part of GS of the Middle-Dnieper megablock (Sura suite). The studied metabasites of Saxagan region (high-iron tholeiitic basalts) as to the nature of REE distribution are close to the Archean basalts GS of type TH 2. Mеtabasites of Kryvbass get to the oceanic plateau basalts field (diagram Zr/Y — Nb/Y), indicating the formation of melts of plume source. They are contaminated by crystal material ((Nb/La)N = 0.24—0.49) and are characterized by small negative value ΔNb (–0.02 ÷ –0.26), which is the result of metamorphism or seizure of the substance of a more ancient basement. As a result, of the processes of amphibolization, silicification and biotitization in metabasites and metakomatiites of Kryvbass the introduction of SiO2, Na2O, K2O, Rb and impoverishment with MgO, CaO, REE are observed.

Keywords: metabasite, metakomatiite, East-Hannivka zone, Saxagan area, REE, contamination.

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