Geomorphological Holocene events as deduced from lithological records of the fluvial basins of Dauria

A conjugate analysis of the processes of morphogenesis and sedimentation within small fluvial basins of Dauria revealed a rhythmic character of change of the Holocene processes which are combined into cycles of a different hierarchical level. It is shown that each cycle begins with an extreme phase...

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Bibliographic Details
Published in:Geography and natural resources 2017-04, Vol.38 (2), p.154-164
Main Authors: Bazhenova, O. I., Cherkashina, A. A., Kobylkin, D. V., Makarov, S. A., Vershinin, K. E.
Format: Article
Language:English
Subjects:
Aridity
Basins
Chronology
Data processing
Dating
Decomposing organic matter
Deposits
Drift
Earth and Environmental Science
Economic Geography
Geography
Geomorphology
Holocene
Humus
Integration
Landscape/Regional and Urban Planning
Morphogenesis
Phase transitions
Pollen
Radiocarbon dating
Radiometric dating
Regional development
Regional planning
Regional Problems of Environmental Studies and Natural Resources Utilization
Rhythms
Sedimentation
Soil analysis
Valleys
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Summary:A conjugate analysis of the processes of morphogenesis and sedimentation within small fluvial basins of Dauria revealed a rhythmic character of change of the Holocene processes which are combined into cycles of a different hierarchical level. It is shown that each cycle begins with an extreme phase of intense fluvial drift and delivery of matter from the system. The fluvial horizons comprise the lower part of deposits of the Holocene macrocycle in the Vesnyanka pad’ (a valley without a permanent watercourse). A disastrous fluvial drift was recorded repeatedly for the period 7–8.5 cal. ka and at the transition time from the Atlantic to Subboreal time. A normal zonal phase of integration of matter within the basins is exhibited by buried humus horizons of soils which give clear evidence of 1800-year cycles. A regional development in Dauria is recorded for the soils with the age of about 8, 6.4 and 4.6 as well as 1.2–1.4 cal. ka. The upper part of the deposits of each cycle is characterized by aeolian horizons of extreme arid phases. The profiles of proluvial trails are indicative of 130-year cycles. Based on results from studying buried soils, data of pollen analysis and radiocarbon dating of the deposits, we determined an enhancement in climate aridization for the last 10 ka and, in general, a decreased of the sedimentation and morphogenesis rate.
ISSN:1875-3728
1875-371X
DOI:10.1134/S1875372817020068