Postglacial incision-infill cycles at the Borisoglebsk Upland: Correlations between interfluve headwaters and fluvial networkстатья

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Дата последнего поиска статьи во внешних источниках: 8 декабря 2019 г.

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1. Полный текст 2019_Shishkina_et_al._ISWCR.pdf 2,4 МБ 20 февраля 2019 [EkaterinaGarankina]

[1] Postglacial incision-infill cycles at the borisoglebsk upland: Correlations between interfluve headwaters and fluvial network / S. Yuliya, G. Ekaterina, B. Vladimir et al. // International Soil and Water Conservation Research. — 2019. — Vol. 7, no. 2. — P. 184–195. The article discusses postglacial landscape transformation of one of the numerous uplands in the Northern Hemisphere Middle Pleistocene glaciation area located in the center of the Russian Plain. We attempted to verify the regional paleogeographic model by reconstructing the Late Pleistocene incision-infill cycles at the Eastern Borisoglebsk Upland based on a comparison of both inactive interfluves headwaters and actual fluvial network palaeoarchives and to determine the past extent of fluvial systems. Interdisciplinary research of the actual and buried topography, lithology and pedogenic properties of surface deposits included remote sensing data interpretation, DGPS survey, and detailed description of geological cores followed by analysis of grain size, chemical and organic contents, microstructure, and numerical dating. Integrating the available results, we propose a scenario of the fluvial network transformation at the Eastern Borisoglebsk Upland over the last 150 ka. At least four fluvial incision stages were determined while network extent has significantly changed through the Late Pleistocene. Three can be generally associated with the regional base level decrease – Late Moscow, Late Valdai and Late Holocene and accompanying isolation of the Nero Lake terraces of 130, 100-105 and 95-98 m. Incision stages were separated by landscape stability or aggradation periods those were asynchronous at the middle and upper parts of the fluvial network. The main agent of initial valley infill appears to be local lacustrine sedimentation altered by alluvial and colluvial deposition towards the second half of Valdai. Revealed landscape conditions variability emphasize the importance of comprehensive local correlations for regional retrospective models. [ DOI ]

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