Landscape dynamics in the Caspian Lowlands since the last deglaciation  reconstructed from the pedosedimentary sequence of Srednaya Akhtuba, Southern  Russia

Lebedeva, M.; Makeev, A.; Rusakov, A.; Romanis, T.; Yanina, T.; Kurbanov, R.; Kust, P.; Varlamov, E.

Авторы: Marina Lebedeva, Alexander Makeev, Alexey Rusakov, Tatiana Romanis, Tamara Yanina, Redzhep Kurbanov, Pavel Kust, Evgeniy Varlamov
Журнал: Geosciences (Switzerland)
Том: 8
Номер: 492
Год издания: 2018
Издательство: MDPI Publishing
Местоположение издательства: Basel, Switzerland, Switzerland
Первая страница: 1
Последняя страница: 21
DOI: 10.3390/geosciences8120492
Аннотация: Surface Kastanozem of the Lower Volga area was first studied as a part of pedocomplex with the lower part (148-160 cm) formed in Early Khvalynian Chocolate clays (13-15 ka), the middle part (100-148 cm) in a mixed clay-loess sediment sand the upper part (0-100 cm) in loess. Resulted from local aeolian transport with the source material derived from rewinding of marine sediments. They are enriched in aggregates of Chocolate clays and glauconitic grains of fine sand-course silt size and have similar contents of clay minerals. The high salinity of similar type evidence marine genesis for both Chocolate clays and source material for loess sediments. Clay fragments of sand and silt size are responsible for the heavy texture and high gypsum content of loess. The study of soils with the focus on micromorphology and clay mineralogy allows revealing complex character of a shift from marine to sub-areal sedimentation. This shift was accompanied by short breaks in sedimentation allowing development of synlithogenic soil horizons of Late Khvalynian, after-Khvanynian and Boreal time. The features of shallowly buried soil horizons confirm increased aridity after the last deglaciation. Surface Calcic Kastanozem is a full Holocene soil reflecting the present environment. However, it is deeply influenced by shallow buried soil horizons and Chocolate clays.
Добавил в систему: Макеев Александр Олегович

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Landscape dynamics in the Caspian Lowlands since the last deglaciation reconstructed from the pedosedimentary sequence of Srednaya Akhtuba, Southern Russiaстатья

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