Highly variable sediment deposition in Lake Imandra, NW Russia, since the Late Pleistocene

Highly variable sediment deposition in Lake Imandra, NW Russia, since the Late Pleistocene
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自晚更新世以来,俄罗斯西北部伊曼德拉湖的沉积物沉积变化很大

DOI:
10.1002/jqs.3353
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发表时间:
2021
影响因子:
2.3
通讯作者:
Wagner B.
Wagner B.
中科院分区:
地球科学3区
文献类型:
--
作者:
Lenz M;Lebas E;Lenz M.M;Fedorov G;Gromig R;Kolka V;Krastel S;Leicher N;Melles M. ;Wagner B.

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为了了解沉积物沉积的动力学和复杂的电流系统在大型湖泊的潜在影响,伊曼德拉湖(科拉半岛)进行了调查。Bolshaya Imandra中部的地震和回声测深仪数据以前所未有的细节揭示了沉积物结构。此外,沉积物岩心数据表明,自晚更新世以来,沉积过程变化很大。湖盆的复杂形态有利于沉积物在洼地中的堆积,在洼地中沉积物得以保存,免受侵蚀。三个主要的地层单位(SU I-III)被确定以上的声学基底。最古老的SU III是最好的保存沿着构造沟和解释为冰川沉积物部分侵蚀的斯堪的纳维亚冰盖在海洋同位素阶段(MIS)2。上覆的SU II沉积物被认为是与MIS 2冰川作用有关的冰碛物。最年轻的SU I代表冰退后沉积的冰川河流、冰川湖泊和湖泊沉积。由于Bolshaya Imandra的南北走向主轴与主导风向平行,该盆地受到强烈的风引起的表层流和补偿性次表层流的影响。这些水流分别出现在水深0-15米和30米以上的地方,它们的速度阻止了沉积物的积累。
To understand the dynamics of sediment deposition and the potential influences of complex current systems in large lakes, Lake Imandra (Kola Peninsula) has been investigated. Seismic and echo‐sounder data of the central part of Bolshaya Imandra reveal the sediment architecture in unprecedented detail. In addition, the sediment core data indicate highly variable depositional processes since the Late Pleistocene. The complex morphology of the lacustrine basin favoured accumulation of sediment in depressions, where they were preserved from erosion. Three main stratigraphic units (SU I–III) were identified above the acoustic basement. The oldest SU III is best preserved along a tectonic trench and interpreted as glacial deposits partly eroded by the Scandinavian Ice Sheet during Marine Isotope Stage (MIS) 2. The overlying SU II deposits are regarded as a till related to MIS 2 glaciation. The youngest SU I represents glaciofluvial, glaciolacustrine and lacustrine sediment deposited after ice retreat. As the north–south‐trending main axis of Bolshaya Imandra runs parallel to the predominant wind direction, the basin is subject to strong wind‐induced surficial currents and compensatory subsurface currents. These currents occur in water depth of 0–15 and deeper than 30 m, respectively, and their velocity prevents sediment accumulation.
俄罗斯西北部白海地区末次间冰期海洋环境
DOI: --
发表时间: 2006
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俄罗斯摩尔曼斯克州科拉半岛及邻近地区冰川地貌
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发表时间: 2006
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发表时间: 2009
期刊:
影响因子: --
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DOI: 10.5194/cp-9-1949-2013
发表时间: 2013-01
影响因子: 4.3
作者:
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通讯作者: M. Sauerbrey;O. Juschus;A. Gebhardt;V. Wennrich;N. Nowaczyk;M. Melles