Geologicheskii Vestnik

The article presents materials on the geochemistry of rare-earth elements, platinoids and gold in volcanogenic-sedimentary sediments of the Shatak complex. As a result of the research, it was established that the picrites of the complex are characterized by low contents of large-ion (Rb, Ba, K) and high-charge (Th, U) elements, and the basalts of the Kuzelga and Karan subformation differin their parameters. Analysis of the indicatorratios(Nb/Y–Zr/Y, Nb/Y–Zr/Y, Lu/Hf–La/Sm) showed that the melt that formed the igneous rocks of the complex has a plume source. The enrichment of igneous rocks of Au, Pd and Rh — with elements characteristic of the main magmatism suggests that the whole diversity of igneous rocks of the Shataksky complex and variations in their precious metal contents are due to the intracameral differentiation of the melt and the subsequent metamorphism of the rocks. It has been established that for most of the important geochemical relations of rare-earth elements, as well as the amounts of platinoids and gold, the average values of the Shatak conglomerates substantially exceed their content in the continental crust. It is concluded that the elevated contents of platinoids and gold in the sedimentary rocks of the complex are due to the direct influence of volcanic-plutonic magmatism on them, followed by redistribution of the substance during metamorphism.

Shatak complex, rare-earth elements, platinoids, gold, picrites, basalts, rhyolites, conglomerates

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