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Elemental composition of biogenic sediments reveals palaeoclimatic changes during the Late Weichselian in a Central European river valley: A statistical approach
Catena ( IF 6.2 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.catena.2021.105188
Daniel Okupny , Dominik Pawłowski

Five sections of sediment from mire infillings located in different part of the catchment small river valley in central Europe were studied by lithological and geochemical analysis in order to examine the response of aquatic ecosystems to the environment changes during Late Weischselian (LW). Differentiation of geochemical composition and grain-size properties in biogenic deposits is being considered as a result of change hydroclimatic conditions and geology structure in individual parts of the catchment. The principal component analysis (PCA) and clustered by hierarchical method (HCA) were chosen to create the lithogeochemical facies and their chronostratigraphy variability. Biogenic sediments of the studied river mires, regardless of the location in a given reach of the valley, are represents mainly by mineral or organic-mineral lithogeochemial facies with increased of lithophilic elements (Na, K and Mg). Similar chemical composition of gyttja and peat sediments in almost all periods of LW, indicate the strongly mechanical denudation processes in the Grabia River valley. The major process, conditioning the development of the mires (in it type and rate sedimentation), was the variable terrigenous material input which are related to its variable dynamic of floods. The higher than expected chemical denudation probably a result of specific groundwater flow direction and dissolving vari-grained sands and silts, which build plains in the central part of the study catchment. The number and thickness of individual lithogeochemical facies are caused by differences in the potential volume of the hydrologically active zone and geological conditions of the emerge or disappear permafrost.



中文翻译:

生物成因沉积物的元素组成揭示了中欧河谷韦氏地区晚期的古气候变化:一种统计方法

通过岩性和地球化学分析研究了位于欧洲中部流域小河谷不同地区泥潭充填物的五段沉积物,以研究水生生态系统对魏氏世界晚期(LW)期间水生生态系统对环境变化的响应。由于集水区各个部分水文气候条件和地质结构的变化,正在考虑生物成因沉积物中地球化学组成和粒度性质的差异。选择主成分分析(PCA)并通过分层方法(HCA)进行聚类,以形成岩性化学相及其年代地层变化。无论所研究的河谷位于何处,都将研究河流泥沼的生物沉积物,是主要由矿物或有机矿物岩化相表示,并增加了亲石性元素(Na,K和Mg)。在几乎所有低水期,gyttja和泥炭沉积物的化学成分相似,这表明在Grabia河谷中存在强烈的机械剥蚀过程。限制泥潭发展的主要过程(泥沙的类型和沉积速率)是变化的陆源物质输入,这与洪水的动态变化有关。高于预期的化学剥蚀率可能是由于特定的地下水流向以及溶解了多种粒度的沙和粉尘而造成的,这些沙粒和粉沙在研究集水区的中部形成了平原。

更新日期:2021-02-01
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