Geologicheskii Vestnik

For the first time, late hypergene mineralization is described in the outcrop of the Zigaza-Komarovo Formation of the Middle Riphean of the Bashkir meganticlinorium near the Kagarmanovo village in the Beloretsk region of the Republic of Bashkortostan. The section reveals tectonized rocks: sandstones, siltstones, clayey and low-carbon shales. Geological observations have revealed the widespread development of supergene sulfate minerals in black shales, which form thin yellow-brown layers, light gray, white and yellow growths and deposits with a square of several tens of dm2. Data from scanning electron microscopy, X-ray fluorescence analysis and X-ray powder diffractometry confirmed the presence of minerals of the copiapite (copiapite, ferricopiapite) and halotrichite (pickeringite) groups. The most intensive formation of hypergene mineralization has occurred under modern conditions over the past 15 years after the openingof rocks during the construction of the Beloretsk — Starosubkhangulovo highway. The formation of sulfate minerals was most influenced by the dislocation of rocks, the presence of black shales containing abundant sulfide mineralization and Corg, and the influence of infiltration and, possibly, meteoric waters. The formation of minerals occurred at a geochemical barrier, and is an intermediate stage in the process of migration and distribution of elements under the conditions of the hypergenesis zone. The results of the study must be taken into account when conducting geoecological monitoring of environmental pollution processes and are of interest for future detailed mineralogical studies.

black shales, hypergenesis, copyapite, pickeringite, alunite, Kagarmanovo section, Southern Urals

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