Smirnov, PavelYesilova, Pelin GungorTrubin, YaroslavDeryagina, OksanaNovoselov, AndreyBatalin, GeorgiiMinnebayev, Kamil2025-05-102025-05-1020220037-07381879-096810.1016/j.sedgeo.2022.1062952-s2.0-85142141207https://doi.org/10.1016/j.sedgeo.2022.106295https://hdl.handle.net/20.500.14720/10274Gareev, Bulat/0000-0002-7346-3722; Smirnov, Pavel/0000-0003-2264-2269; Minnebaev, Kamil/0000-0002-1785-442XThis paper reports the geochemical, structural, and textural properties of evaporite minerals (gypsum) interbed-ded with from the Early Paleogene diatomite and clastics exposed in the diatomite quarry in the Kamyshlov town quarry, Trans-Urals region (Sverdlovsk Oblast, Russia). This article is the first to reveal the occurrence of these atypical minerals in local sediments for the Trans-Urals region, dating from the Paleocene to the Early Eocene. The investigated aggregates included gypsum, anhydrite, and diatomite. Gypsum crystallization occurred rapidly in the low-density non-lithified stratum of the seafloor sediment under warm conditions. Gypsum elemental composition reflects its genesis in a low bio-productivity environment strongly influenced by the influx of highly mineralized groundwater. Terrigenous influx (coarse-grained quartz and fine clay fractions) is high. As a result, radial-fibrous stellate gypsum crystals formed in the fissures that penetrated the diatomite stratum. Geochemical indicators, such as Sr/Ba ratios, show that the salinity of the watershed was variable at the onset of evaporitic con-ditions. Chronologically, gypsum formation is dated to the beginning of the transgressive cycle (early Eocene, the end of the Paleocene-Eocene Thermal Maximum (PETM)) or to the end of post-PETM sedimentation. (c) 2022 Elsevier B.V. All rights reserved.eninfo:eu-repo/semantics/closedAccessGypsumEvaporitesAnhydriteDiatomitePaleogeneTrans-UralsPaleocene-Eocene Thermal MaximumArticle442Q1Q1WOS:000901985900004