DOI 10.21440/2307-2091-2017-1-7-13
New data on petrogeochemistry of volcanic rocks of Sukholozhsky area of the east slope of the Middle Urals and their geodynamic interpretation pdf
E. N. Volchek, E. A. Slobodchikov, V. N. Ogorodnikov, Yu. A. Polenov, V. S. Chervyakovskiy
The studied sections of Middle Paleozoic volcanoes are located within the eastern area of the Middle Urals, where thick strata of volcanogenic-sedimentary rocks is widespread, from the Silurian to Upper Carboniferous inclusively. Cut of the Devonian-Carboniferous rocks on the river Pyshma site attracts attention due to several factors.
Metamorphosed volcanic and volcanic-sedimentary complexes of Middle Devonian and Early Carboniferous age developed relatively weakly here. The good preservation of the products of ancient volcanic eruptions allows us to estimate nature and tendency of the volcanic activity during this period. In addition, the studied territory has a wellknown promising ore sites, and scientists already studied and described the petrographical composition and chemistry of the volcanic rocks from geological sections of the Pyshma River. Geochemical data on them were absent until recently. We obtained new petrogeochemical data on Middle Paleozoic volcanic rocks, including those containing scattered sulphide mineralization, from geological sections along the Pyshma River and its tributaries. Compared to the average ocean tholeiites (N-MORB) studied basalts are enriched with large-ion elements (Rb, Ba, Sr, Th) and are depleted with highly charged elements (Ti, Nb, Ta, Zr, Hf). Their analysis showed that by the content of petrogenic and trace elements studied lithophilic volcanites are close to the island arc formations of modern tectonic environments. One can use conclusions on geodynamics in solving the problem about the nature of the mineralization manifested here. The most interesting in Sukholozhsky area is the Shatinsky ore station, where we identified iron pyrite and of copper-zinc mineralization with the industrial content, found layers of rubble ore, hematite rocks with inclusions of cupreous pyrite.
Keywords: Middle Paleozoic volcanic rocks; basalts; rhyolites; petrogeochemical data; cupreous-zinc mineralization.
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