Paleosols From the Urzhumian (Middle Permian) Reference Section, Kazan Volga Region, Russia

Mouraviev, Fedor

doi:10.5593/sgem2018/1.1/s01.049

Cited by 3 publications

(4 citation statements)

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“…Two geological localities of the Verkhny Uslon District, namely Pechischi and Cheremushki, are well-known as highly important objects for the understanding of the Upper Kazanian (upper Roadian) and Urzhumian (Wordian) deposits of the eastern Russian Platform, as well as for the international stratigraphical correlation developments [33,41,[52][53][54][55][56][57][58]. Detailed stratigraphical, sedimentological, geochemical, paleontological, and palaeogeographical characteristics of these localities are available (see references above), and it would be unreasonable to repeat them.…”

Section: Methodsmentioning

confidence: 99%

“…The international scientific importance of Cheremushki is underlined by its utility for the correlation of the global and regional standards of the Guadalupian Series (the established correlation [42] seems to be only preliminary and requires justifications). Some other worldwide-relevant research projects have been carried out there [33,41,54]. The educational and touristic importance is generally the same as in the case of Pechischi (see above), but here, it is more limited because of the lesser diversity of unique phenomena (Table 1) and lower status of the section as a reference section and not stratotype.…”

Section: Cheremushkimentioning

confidence: 99%

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Earth Science Frontier at Urban Periphery: Geoheritage from the Vicinity of Kazan City, Russia

2023

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Characterizing geological heritage sites (geosites) available in Russia remains an urgent task. The present study focuses on two geosites from the vicinity of Kazan—a large city on the Volga River. They are attributed to the standardized geoheritage types and scored by means of several criteria. It is found out that the Pechischi geosite represents nine geoheritage types, from which the stratigraphical type (stratotype section of the Upper Kazanian regional unit of the Guadalupian) and the geohistorical type (history of the Permian System studies) are the most important. This geosite reaches 675 out of 750 maximum possible scores, and it is ranked globally. The Cheremushki geosite represents six geoheritage types, from which the stratigraphical type (reference section of the Urzhumian regional unit of the Guadalupian) and the paleontological type (locality of diverse fossils, including tetrapods) are the most important. This geosite reaches a score of 250 and is ranked nationally. The undertaken study allows for recommending several actions for the effective conservation and exploitation of these geosites. The innovative interpretation is that the presence of geosites at the urban periphery makes its general (not only geological) heritage value comparable to that of the city’s center.

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Section: Methodsmentioning

confidence: 99%

Section: Cheremushkimentioning

confidence: 99%

Earth Science Frontier at Urban Periphery: Geoheritage from the Vicinity of Kazan City, Russia

2023

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“…Широкое развитие карбонатных нодулей во всех типах палеопочв, а также сликенсайдов в глинистых разностях этих почв указывает на сезонный субаридный/субгумидный теплый климат. Присутствие каолинита в илистой фракции палеопочв казанского яруса разреза Сентяк может указывать на более влажный климат в казанское время по сравнению с уржумским, изученным ранее по палеопочвам уржумского яруса опорных разрезов Татарстана [4][5][6][7]. Оценка среднегодового количества осадков по геохимическим индикаторам палеопочв показала значения 476-624 мм/год, что характерно для субтропического субаридного/субгумидного климата, выявленного по педогенным признакам.…”

Section: заключениеunclassified

“…Палеопочвы представляют собой ценный архив геологической информации, позволяющей реконструировать палеоландшафтные и палеоклиматические условия, выявлять перерывы в осадконакоплении и тем самым дополняющей палеонтологическую характеристику осадочных пород. Пермские палеопочвы Волго-Уральской области, сформированные на красноцветных терригенных осадках, в настоящее время изучены недостаточно, большинство работ посвящено исследованию палеопочв уржумского и северодвинского ярусов пермской системы [1][2][3][4][5][6][7].…”

Section: Introductionunclassified

Paleosols from the Kazanian Red Beds of the Sentyak Section, Russia

Mouraviev¹,

Kropotova²,

Gareev³

et al. 2022

Uch. Zap. Kazan. Univ. Ser. Estestv. Nauki

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This article summarizes the results of a comprehensive study of paleosol profiles in the Lower Kama Regionfrom the Kazanian reference section near Sentyak and from the reference section of the boundary deposits of the Ufimian and Kazanian in Elabuga. The paleosol profiles in the Kazanian deposits were identified, and their features were analyzed to reconstruct the paleoclimatic and paleolandscape conditions. The following three types of paleosols were singled out, differing from one another in their degree of development and pedogenic features: Protosols and moderately and strongly developed Calcisols. The latter proved to be characteristic only of the Lower Kazanian deposits. Based on the obtained sedimentological and paleontological characteristics of the host rocks, the fluviolacustrine depositional settings were reconstructed. The pedofeatures of the paleosols (slickensides, carbonate nodules) indicate a seasonally warm climate. The mean annual precipitation inferred from the geochemical indices of the paleosol profiles is 539 and 476 mm/yr for the Lower and Upper Kazanian paleosols, respectively, which, along with the pedofeatures, is indicative of a subhumid/semiarid climate. The oxygen isotopic composition of the carbonate nodules from the paleosols reflects some aridization of the climate in the Early Kazanian (29.7‰ SMOW δ 18 O) compared to the Ufimian (18.7‰ SMOW δ 18 O) and Late Kazanian (22.3‰ SMOW δ 18 O) times. The lack of gley features argues for the automorphic character of the paleosols, while their small thickness, truncated upper horizons, and weak development in the Upper Kazanian deposits suggest that the rate of sedimentation exceeded the rate of soil formation.

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Urzhumian Pedocomplexes of the Kazan Volga Region (Eastern Europe): An Example of Paleoclimate and Paleolandscapes of the Subtropics of the Continental Pangea in the Middle Permian

Mouraviev,

Kropotova,

Gareev

et al. 2024

jour

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The paleosol profiles of the Urzhumian from the section on the right bank of the Volga River near the village of Grebeni were studied by field and laboratory methods. Two paleosol profiles on red clayey siltstones were identified. They were classified as strongly developed Vertic Calcisols based on their pedogenic features such as horizonation, carbonate nodules, slickensides, etc. The climate during their formation was found to be seasonally wet and warm. The mean annual precipitation was calculated from the geochemical indices of the paleosols and amounted to 522 mm/year for the Late Urzhumian. The reddish-brown soils in the dry subtropics of the Mediterranean or Australia can be considered as modern analogs of these paleosols.The upper paleosol profile is a pedocomplex consisting of four single soils separated by nonpedogenic carbonate layers in the middle part. The pedocomplex structure contains one lacustrinepalustrine and two lacustrine-playa sedimentary microrhytms, which indicate the setting of lacustrinealluvial plains and make it possible to estimate the duration of its formation spanning thousands to tens of thousands of years.A pedocomplex with a similar structure was identified in the upper part of the Urzhumian of the reference section in the Cheremushka Ravine. Both pedocomplexes have very similar mineralogical, chemical, and granulometric composition of their siliciclastics, as well as the isotopic composition of pedogenic nodules. The biostratigraphic position of the pedocomplex in the Cheremushka Ravine shows that it is coeval with the pedocomplex of the Grebeni section. The correlation between them is direct, making them a useful pedostratigraphic marker. It is suggested to label this marker horizon as the “Crimson Clay pedocomplex”.

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Paleosols From the Urzhumian (Middle Permian) Reference Section, Kazan Volga Region, Russia

Cited by 3 publications

References 0 publications

Earth Science Frontier at Urban Periphery: Geoheritage from the Vicinity of Kazan City, Russia

Earth Science Frontier at Urban Periphery: Geoheritage from the Vicinity of Kazan City, Russia

Paleosols from the Kazanian Red Beds of the Sentyak Section, Russia

Urzhumian Pedocomplexes of the Kazan Volga Region (Eastern Europe): An Example of Paleoclimate and Paleolandscapes of the Subtropics of the Continental Pangea in the Middle Permian

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