On Stratigraphy and Flora of Cretaceous Deposits in the Chulym-Yenisei Region, Western Siberia

Shczepetov, S. V.

doi:10.1134/s086959381804007x

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…The sedimentary record of the Ilek and Kiya Formations [34,90] includes known oceanic anoxic events [91][92][93], such as the Early Aptian anoxia (OAE Ia) and Cenomanian-Turonian anoxia (OAE 2). A relationship was established between the hypoxia of the bottom water and global oceanic anoxia during the Cretaceous period in coeval marine ooidal ironstone deposits in Western Siberia [47].…”

Section: Paleo-environmental Conditionsmentioning

confidence: 99%

“…Cretaceous sediments of Ilek and Kiya Formations contain a variety of continental fossils, including the following remains: Psittacosaurus sibiricus, Evgenavis nobilis, Hemicorbicula elegans, Musculiopsis dolosus, Darwinula contracta, Cypridea faveolata, Ginkgo digitata, Cladophlebis longifotia, Sequoia reichehbachii, Sphaerium tasaranica, etc. [34,[53][54][55][56]. The interval from the Cenomanian to the Eocene witnessed a period of tectonic dormancy, during which the peneplanation took place.…”

Section: Introductionmentioning

confidence: 99%

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Depositional Conditions of Cretaceous Ironstones Deposit in the Chulym-Yenisey Basin (Western Siberia)

et al. 2021

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This study reconstructs the depositional conditions of ironstones within the Chulym-Yenisey basin and assesses the iron source. The detrital minerals of the studied deposits include quartz and feldspar. The authigenic minerals are goethite, siderite, aragonite, dolomite, calcite, apatite, barite, and pyrite. The clay components include minerals of the chlorite group (possible chamosite), nontronite, kaolinite, illite, and beidellite. Local bacterial sulfate reduction led to the formation of pyrite framboids in siltstone layers. The subsequent diagenetic iron reduction promoted the formation of chamosite from siderite. The goethite precipitation occurred in an oxidic aqueous environment. The Cretaceous continental sediments of the Ilek and Kia Formations of the Chulym-Yenisei depression consist of fine- and medium-grained, cross-stratified, poorly sorted litho-feldspatho-quartzose sandstones of fluvial channel origin alternating with bluish-gray siltstones and ironstones of floodplain–lacustrine–bog origin. Thin layers of iron-bearing rocks within siltstones formed in meromictic waters. The changes in geochemical proxies demonstrate fluctuations of paleoenvironmental conditions within the Cretaceous sequence. Siltstones and sandstones formed under humid and arid conditions, respectively. The primary iron source for sediments of the Chulym-Yenisey depression was determined as volcanogenic and igneous rocks of the Altai-Sayan mountainous region.

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Section: Paleo-environmental Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Depositional Conditions of Cretaceous Ironstones Deposit in the Chulym-Yenisey Basin (Western Siberia)

et al. 2021

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Marine Reptiles and Climates of the Jurassic and Cretaceous of Siberia

Rogov

Zverkov

Захаров

et al. 2019

Stratigr. Geol. Correl.

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Early Cretaceous continental sedimentatary environments, palaeogeography and biota of southeastern Western Siberia

Ivantsov,

Fayngerts,

Feofanova

et al. 2024

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The Ilek Formation was distinguished by Ragozin in 1936 in the southeast of Western Siberia, as a sequence of continental deposits accumulated in the alluvial and lacustrine environments, dating Barremian-Early Albian. In the end of XX century a series of sites, comprising a rich and diverse Early Cretaceous vertebrates were discovered, that forced an intensive comprehensive research of the Ilek Formation. The stratotype section of the Bolshoi Ilek represents the abnormal section of the Ilek Formation, comprising the deposits of prodelta, delta front, and mouth bars. Three regions within the area of the Ilek Formation reflect the evolution of the fluvial system. The eastern region represents the oldest part of the section, preliminary dated to the Barremian based on spore and pollen analysis in addition to lithological characteristics. The western region was probably deposited during OAE-1a. The central region represents the final stage of the tectonic cycle, deposited within the environments of the calm plain river and fluvial delta. The vertebrate assemblages distinguished for the Kiya and Bolshoi Kemchug basins have specific features, which can support the heterochrony of the Ilekian deposits.

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On Stratigraphy and Flora of Cretaceous Deposits in the Chulym-Yenisei Region, Western Siberia

Cited by 3 publications

References 11 publications

Depositional Conditions of Cretaceous Ironstones Deposit in the Chulym-Yenisey Basin (Western Siberia)

Depositional Conditions of Cretaceous Ironstones Deposit in the Chulym-Yenisey Basin (Western Siberia)

Marine Reptiles and Climates of the Jurassic and Cretaceous of Siberia

Early Cretaceous continental sedimentatary environments, palaeogeography and biota of southeastern Western Siberia

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