geomorfГеоморфология и палеогеографияGeomorfologiya i Paleogeografiya2949-17892949-179710.31857/S0435428122030038geomorf-2505Research ArticleСедиментология, палеогеокриология, палеогидрологияSedimentology, palaeogeocryology, palaeohydrologyМорфоскопия кварцевых зерен из отложений гривных толщ Тобол-Ишимского междуречьяQuartz grains surface texture of the crest relief deposits of the Tobol-Ishim interfluvesАлексееваВ. А.AlekseevaV. A.ЛаринС. И.LarinS. I.ЛаринаН. С.LarinaN. S.Московский государственный университет имени М.В. Ломоносова, географический факультетРоссияLomonosov Moscow State University, Faculty of GeographyRussian FederationИнститут криосферы Земли ТюмНЦ СО РАНРоссияEarth Cryosphere Institute, Tyumen Scientific Centre SB RASRussian FederationТюменский государственный университетРоссияTyumen State University, Institute of ChemistryRussian Federation202207102022533Геоморфология117127Copyright © Алексеева В.А., Ларин С.И., Ларина Н.С., 20222022Алексеева В.А., Ларин С.И., Ларина Н.С.Alekseeva V.A., Larin S.I., Larina N.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://geomorphology.igras.ru/jour/article/view/2505

В работе приведены результаты морфоскопии кварцевых зерен с целью реконструкции условий осадконакопления и особенностей формирования гривной толщи в разрезе “Кареглазова” (юго-западная часть Западно-Сибирской равнины). С помощью растрового электронного микроскопа (РЭМ) изучены кварцевые зерна фракции среднего песка (0.25–0.5 мм) из 19 образцов. В гранулометрическом отношении грива сложена преимущественно мелким низкосортированным песком с большой долей глинистой и алевритовой компоненты. Выявлены четыре типа зерен, различных по морфологии и комплексу текстур поверхности, которые демонстрируют следы переноса и накопления в различных средах. Коэффициент окатанности частиц фракции среднего песка (по А.В. Хабакову) варьирует по разрезу от 54 до 65%. Преобладают угловато-окатанные зерна кварца (до 57%), доля хорошо окатанных зерен в среднем составляет 39%. Многие кварцевые зерна несут следы постседиментационных преобразований в виде кремневой пленки осажденных коллоидов, скоплений аморфного кремнезема различной интенсивности, следов травления ранее сформированных текстур. Коренными источниками для отложений гривы, по всей видимости, служат аллювиально-озерные отложения различного возраста, распространенные в районе исследований. Микроморфология поверхности большей части кварцевых зерен несет следы эоловой обработки и наложения эоловых текстур поверхности (мелкоямчатый микрорельеф) на рельеф поверхности зерен с чертами аквального происхождения (V-образные микроуглубления, серпообразные желобки, гладкая глянцевая поверхность). Встречаемость специфических эоловых текстур поверхности в основном только на выпуклых участках кварцевых зерен и наличие криогенных текстур поверхности свидетельствуют об аккумулятивном формировании грив и преобладании преимущественно местного (ближнего) переноса вещества в холодных и аридных условиях перигляциального климата. Верхняя часть разреза гривной толщи, вероятно, формировалась в условиях относительно умеренного гумидного климата, когда была возможной миграция коллоидных растворов.

The paper presents the results of quartz grains surface textures study in order to reconstruct the sedimentary history and deposition environments of the crest strata formation in the Kareglazova section (southern part of the West Siberian Plain, Russian Federation). Using a scanning electron microscope (SEM), quartz grains of the medium sand fraction (0.25–0.5 mm) from 19 samples were studied. The crest is composed mainly of fine low-sorted sand with a large proportion of clay and silt components. The studied samples from the Kareglazova section contains four main types of quartz grains with different morphology and complexes of surface textures, which bear signs of transportation and accumulation in various environments. The roundness ratio of grains of the medium sand fraction (according to A.V. Khabakov) varies across the section from 54 to 65%. Semi-rounded quartz grains predominate (up to 57%), the share of well-rounded grains averages 39%. Vast majority of grains bear traces of post-sedimentary transformations, which are expressed in the presence of amorphous silica films and traces of etching of previously formed textures. Alluvial-lacustrine sediments of different age, common in the study area, are likely to be the primary sources for the crest deposits. The quartz grains surface features have traces of eolian processing and overlay of aeolian surface textures (upturned plates) on the surface textures typical for subaqueous environments (V-shaped pits, curved grooves, smooth surface). The occurrence of specific aeolian surface textures mainly on convex areas of quartz grains and the presence of cryogenic processing traces indicate the accumulative nature of crest with the predominance of local terrigenous provenances in cold and arid conditions of the periglacial climate. The upper part of the crest section was probably formed in a relatively moderate humid climate, when the migration of colloidal solutions was possible.

гривно-ложбинный рельефЗападная Сибирьморфоскопия песчаных зеренрастровая микроскопияэоловые процессыкриогенезпокровные отложенияridge (crest)-hollow reliefWestern Siberiaquartz grains surface texturesSEMaeolian processescryogenic processescover depositsRussian Foundation for Basic Research (project No. 20-05-00734 A), framework of state assignments No. 121040100323-5 and No. 121041600042-7, Laboratory of geochemistry and soil mineralogy of the Institute of Physicochemical and Biological Problems of Soil Science Russian Academy of Sciences, Pushchino (head of the laboratory, Dr Biological Sci. A.O. Alekseev), A.S. YakimovRussian Foundation for Basic Research (project No. 20-05-00734 A), framework of state assignments No. 121040100323-5 and No. 121041600042-7, Laboratory of geochemistry and soil mineralogy of the Institute of Physicochemical and Biological Problems of Soil Science Russian Academy of Sciences, Pushchino (head of the laboratory, Dr Biological Sci. A.O. Alekseev), A.S. 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