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首页> 外文期刊>Proceedings of the International Association of Hydrological Sciences >Lake sedimentation as an agent of postglacial transformation of interfluves and fluvial landscapes of the Borisoglebsk Upland, Central European Russia
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Lake sedimentation as an agent of postglacial transformation of interfluves and fluvial landscapes of the Borisoglebsk Upland, Central European Russia

机译：湖泊沉积物作为博尔塔布斯布斯克普兰（北欧）俄罗斯中部博伊特布斯克州的白斑和河流景观的代理商

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Borisoglebsk Upland is considered an example of a secondary upland plain in the marginal zone of the last Middle Pleistocene glaciation. Moraine hills and kames were reworked by glaciofluvial processes and incised by small fluvial forms later. Its postglacial surface drift cover is regularly defined as an undivided complex of mantle loams of dominantly subaerial origin with characteristic cryogenic features and remnants of paleosols. However, some previous studies suggest that lake sedimentation played an important role in the postglacial history of the Borisoglebsk Upland. This paper presents results of a detailed investigation of postglacial sedimentary cover of the eastern part of the Borisoglebsk Upland aimed to reconstruct the co-evolution of surface deposits, soil cover and geomorphic landscapes since degradation of the last Middle Pleistocene glaciation about 150 ka (MIS-6). The study is essentially based on a comprehensive lithological, pedological and geocryological description of postglacial deposits in cores (hand or machine-driven) and open sections, systematic sampling for grain size analysis and selective sampling for 14C absolute dating and monoliths structural examination. The results indicate that most of the surface drifts in this feature consists of stratified lacustrine deposits. Their Late Pleistocene age is stratigraphically confined by the underlying paleosols and incorporated peats of the Mikulino interglacial age (MIS-5) and several organic-rich layers within the lake sequence 14C dated to the Middle Valdai interstadial (MIS-3). Overlying mantle loams and colluvial deposits with cryogenic features and low organic matter content those facially substitute lacustrine sediments were attributed to the Late Valdai stadial (MIS-2). After the Mid-Holocene stabilization, relatively thin colluvial cover identified by the increased amount of organic matter also deposited. We conclude that lacustrine sedimentation is the primary Late Pleistocene agent that transformed the initial glacial topography and most characteristic type of lithodynamics of the eastern Borisoglebsk Upland.
机译：Borisoglebsk普满被认为是最后一个中间渗透冰川边缘区域的二级普通普通普通的示例。莫莱恩山和卡纸被Glaciofluvial工艺重新加工，并通过小型河流形式切成。其后缘表面漂移覆盖经常定义为占主导地位源的不可分割的沉淀沉积物，具有特征低温特征和古溶剂的残余物。然而，一些先前的研究表明，湖泊沉降在博伊塔布斯克普兰的后缘历史中发挥着重要作用。本文提出了博伊塔布斯克普兰东部地区后纤维沉积封面的详细调查，旨在重建地表沉积物，土壤覆盖和地貌景观的共同演变，因为上一次中间渗透率约为150 kA（MIS-） 6）。本研究基本上基于核心（手或机器驱动）和开口部分的全面岩性沉积物的全面岩性，神学和地理统计学描述，用于晶粒尺寸分析的系统采样和14℃绝对约会和整料结构检查的选择性取样。结果表明，该特征中的大多数表面漂移包括分层涂层沉积物。他们晚期的渗透素年龄是由底层古溶症的地层局限于萼片中间尖峰（MIS-5）的泥炭，并在湖序列14c内掺入湖泊序列14c内的几个有机物层（Mis-3）。覆盖的地幔壤土和具有低温特征和低有机物质含量的血管沉积物将面临莱达沉积物的低有机质含量归因于已故的缬沙达体育（MIS-2）。在中全新世稳定后，通过增加的有机物质量鉴定的相对薄的抗癌覆盖。我们得出结论，湖泊沉降是初级晚期优质烯代理，转变初始冰川地形和最壮观的东部博伊塔布尔斯克万亿的岩性动力学。

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