Stratigraphy and lithology
| Article # 23_2023 | submitted on 02/10/2023 displayed on website on 06/22/2023 |
| 18 p. | Kudamanov A.I., Karikh T.M. |
| Synsedimentary delta deformations - as an example of the Nizhne Kheta Formation of the Suzun area of Western Siberia | |
| Certain aspects of deformations in delta settings synchronous with sedimentation are considered on the example of the Berriasian-Valanginian productive level NK-1 of the Lower Cretaceous of the West Siberian plate. According to the core study, in the sandstones of the deltaic lobe, two systems (by layering and in a cross) of flat segregations of clay material were established. In modern settings, deformations of non-tectonic origin are described that occur during the accumulation of sandy material in the depocenter of the delta. The rapid accumulation of large masses of delta sands on undercompacted clays of the prodelta leads to liquefaction and "superfluidity" of clays. The uneven subsidence of the sand blade is accompanied by its bending and the formation of scaly stratification and sheer fissure-like decompaction zones oriented along the coastline. Liquefied clays are introduced along the deformation zones, forming a vein-like filling. Similar non-tectonic deformations have been established in coastal cliffs that have exposed rocks of the Carboniferous, Triassic, and Cretaceous. Keywords: Lower Cretaceous sedimentation, delta depocenter, clay liquefaction, Nizhne Kheta Formation, Suzun area, Western Siberia. |
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| article citation | Kudamanov A.I., Karikh T.M. Deformatsii v oblasti del'ty, sinkhronnye osadkonakopleniyu, na primere nizhnekhetskoy svity Suzunskoy ploshchadi Zapadnoy Sibiri [Synsedimentary delta deformations - as an example of the Nizhne Kheta Formation of the Suzun area of Western Siberia]. Neftegazovaya Geologiya. Teoriya I Praktika, 2023, vol. 18, no. 2, available at: http://www.ngtp.ru/rub/2023/23_2023.html EDN: UPQVMR |
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