GEOCHEMICAL FEATURES OF METABASITE OF PAVLOVKA AND ZELENIY GAY GREENSTONE STRUCTURE OF EASTERN AZOV (UKRAINIAN SHIELD)

Abstract

Pavlovka and Zeleniy Gay greenstone structure different from other greenstone structures of Azov megablock lack of ultramafic volcanics. Metabasites of Pavlovka GS related to the tholeiitic series and discover the trend of iron enrichment and metabasites of Zeleniy Gai – belong to calc-alkaline series. From bottom to top in the section in the metabasites of metatoleite formation of Pavlovka GS increases iron, titaniferous content and rare earth elements and reduced alumina content. Metabasites of lower parts of metatoleitick formation belongs to the type N-MORB and the top – to the type E-MORB. The latter differ of Nb positive anomaly (Nb/Nb* = 1,35). Metabasites of Zeleniy Gay GS among the most leucocratic varieties mafic potassium and related to the type of calc-alkaline basalts. It has been much more content of Rb, Sr, Ba, REE, Th, Pb and smaller – Ni, Cr and V. Metabasites of Pavlovka and Zeleniy Gay greenstone structures of the Eastern Azov formed from magma plume sources (ΔNb = +0,03ч0,43). The presence in a cross-sectional Zeleniy Gay andesites may indicate their formation in island-arc regime unlike rift greenstone structures of West-Priazov block.