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Paleosols and host rocks from the Middle–Upper Permian reference section of the Kazan Volga region, Russia: A case study

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dc.contributor.author Mouraviev F.
dc.contributor.author Arefiev M.
dc.contributor.author Silantiev V.
dc.contributor.author Eskin A.
dc.contributor.author Kropotova T.
dc.date.accessioned 2020-01-22T20:42:04Z
dc.date.available 2020-01-22T20:42:04Z
dc.date.issued 2019
dc.identifier.issn 1871-174X
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/158004
dc.description.abstract © 2019 The Urzhumian (Wordian) and Severodvinian (Capitanian) reference section of the Monastery Ravine (Kazan Volga region, Russia), contains two siltstone lithofacies: (a) laminated and (b) massive. Depositional settings of the laminated siltstones can be interpreted as perennial to ephemeral lakes; depositional settings of the massive siltstones are interpreted as floodplains with soil cover and periodical silt influx in wet seasons. The bulk geochemistry of siliciclastics has revealed a high degree of weathering of both types of siltstone. The similar chemical composition, mineralogy, and grain size suggest the same provenance of silt material. Geochemical data indicate eastern source rocks, which are the Permian red beds of the Cis-Ural plains. The main genetic types of paleosols hosted in the massive siltstones in the studied section, include moderately developed Vertisols and Calcisols with drab-colored root traces, calcareous nodules, low chroma mottles, angular blocky peds and slickensides. These pedofeatures indicate in general a semi-arid climate with clear seasonality of rainfall. Major oxides of the paleosol matrix were used to estimate paleoprecipitation through the bases to alumina (ΣBases/Al) ratio and chemical index of alteration minus potassium (CIA-K) proxies. Estimates from Urzhumian paleosols indicate relatively low mean annual precipitation (MAP) of 390 mm/yr. The transition to the Severodvinian paleosols is marked by a noticeable MAP increase up to 777 mm/yr. This climate moistening coincides with changes in the morphology of paleosols from dolomitic with low redoximorphy to calcitic with gley horizons. The pedogenic carbonate nodules consisting of dolomicrite (5–10 μm) are very common in the Urzhumian paleosols and their morphology, micromorhology and isotopic features indicate the pedogenic origin of dolomite. Sedimentological and paleopedological features of the studied siltstones, as well as the location of the Volga-Ural basin in a mid-latitude position (25–32 °N) indicate a monsoonal character of precipitation during the Middle Permian.
dc.relation.ispartofseries Palaeoworld
dc.subject Dolomite
dc.subject Paleosol
dc.subject Permian
dc.subject Severodvinian
dc.subject Siltstone
dc.subject Urzhumian
dc.title Paleosols and host rocks from the Middle–Upper Permian reference section of the Kazan Volga region, Russia: A case study
dc.type Article
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS1871174X-2019-SID85066807416


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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