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Abstract <p>Cupriferous sandstones contain fragments of chloritized volcanic rocks, silicified volcanic glasses and carbonized plant relics, grains of feldspars (K-feldspar and plagioclase), quartz, clays, chlorite, calcite, and accessory epidote, zircon, apatite, barite, ilmenite, silver sulfide, ilmenite and chromite. The Cu-bearing minerals include chalcopyrite, bornite, nonstoichiometric minerals of the chalcocite-covellite series (djurleite, spionkopite, yarrowite, covellite), malachite and mottramite. Two pyrite varieties are identified: microcrystals replaced by Fe-oxyhydroxides and framboids replaced by copper sulfides. Cupriferous sandstones are characterized by varying contents of major oxides depending on the ratio of the amount of detrital material and carbonate cement in the rock. The marker trace elements of sandstones are Ba, Sr, and REE with high contents and Cr, Ni, Zn, As, Mo, Sb, Pb, U, Th, V, and Zr. The δ<sup>18</sup>O and δ<sup>13</sup>C values in calcite vary from +22.24 to +29.35‰ (SMOW) and from –5.34 to –18.0‰ (PDB), respectively. Based on the structural-textural and mineralogical-geochemical features, the studied sandstones can be classified as the coastal-marine deposits.</p>

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Mineralogical and Geochemical Peculiarities of Cupriferous Sandstones from the Bym Area of Upper Permian Sedimentary Rocks, Western Cis-Urals

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • N. R. Ayupova,
  • E. V. Shepel,
  • I. A. Blinov,
  • S. A. Sadykov

摘要

Abstract

Cupriferous sandstones contain fragments of chloritized volcanic rocks, silicified volcanic glasses and carbonized plant relics, grains of feldspars (K-feldspar and plagioclase), quartz, clays, chlorite, calcite, and accessory epidote, zircon, apatite, barite, ilmenite, silver sulfide, ilmenite and chromite. The Cu-bearing minerals include chalcopyrite, bornite, nonstoichiometric minerals of the chalcocite-covellite series (djurleite, spionkopite, yarrowite, covellite), malachite and mottramite. Two pyrite varieties are identified: microcrystals replaced by Fe-oxyhydroxides and framboids replaced by copper sulfides. Cupriferous sandstones are characterized by varying contents of major oxides depending on the ratio of the amount of detrital material and carbonate cement in the rock. The marker trace elements of sandstones are Ba, Sr, and REE with high contents and Cr, Ni, Zn, As, Mo, Sb, Pb, U, Th, V, and Zr. The δ18O and δ13C values in calcite vary from +22.24 to +29.35‰ (SMOW) and from –5.34 to –18.0‰ (PDB), respectively. Based on the structural-textural and mineralogical-geochemical features, the studied sandstones can be classified as the coastal-marine deposits.