Geochemistry of pelitomorphic rocks Solikamskaya Formation

Abstract

The general geochemical specificity of the Solikamsk Formation is shown, manifested in the titanium minimum and selenium-cadmium-tellurium maximum. Most of the lithophilic, chalcophilic, and siderophilic elements are associated with il-lite, the content of which first decreases along the section and then increases, which is explained by the transgression and subsequent retreat of the sea. A smaller part is associated isomorphically with carbonate (with dolomite Mo and Pd, with calcite - TR) or sulfate composition (Sr) and associated sulfate reduction (As, Te, Ru, Rh, Hg, Re). It is shown that the rocks of the post-salt deposits are depleted in lithophilic elements, enriched in low-melting noble metals, which, along with the absence of a europium minimum, indicates a substantially basaltoid composition of the petro-fund, which is consistent with the femic specialization of the Ural orogen. It is noted that a gradual "continentalization" of the sediment composition occurs up the section, manifested in an increase in the content of lithophiles, including due to aleuropsammitic material.