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Accumulation of metals and changes in composition of freshwater lake organic sediments during the Holocene
Chemical Geology ( IF 3.9 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.chemgeo.2020.119502
Karina Stankevica , Zane Vincevica-Gaile , Maris Klavins , Laimdota Kalnina , Normunds Stivrins , Ieva Grudzinska , Enn Kaup

Abstract The distribution of metals in the strata of sediments deposited in the freshwater environment formed during the Holocene in the territory of Latvia has been studied rather insufficiently. Considering the large volume of accumulated organic matter in sediments, studies on the content of metallic elements in sediments can help to determine the peculiarities of the metal accumulation process in limnic systems and the biogeochemical cycling of metals. Lake Pilvelis, which is located in the eastern part of Latvia (the northern part of Europe), was selected as the main study site. Lake Pilvelis is a small lake of a glacial origin, and >90% of its depression is filled with organic-rich sediments. The development stages of Lake Pilvelis since circa 10,000 cal BP are described in detail via reconstruction of the Holocene palaeoenvironmental conditions using multi-proxy sedimentary records. The elemental composition and content of metallic elements in sapropel are analysed with the main objectives of characterising the accumulation rate of metals in the full profile of sapropel and determining the anthropogenic impact depending on the evolution of the lake and the genesis of sediment organic matter. The correlation among the components characterising sediments such as sapropel and metallic elements revealed that the elemental distribution could be divided into three main groups according to the content of the elements associated with organic compounds (e.g., for Zn and Mn) and mineral compounds (for Ni, Co, Cr, K, Fe, Mg, and Cu). Ni and Co are partly associated with mineral compounds and partly associated with carbonates. A principal component analysis revealed the main factors indicating the origin of metallic elements and the accumulation tendencies of metals in sediment layers: the input of the mineral matter, the characteristics of organic matter, and human impact. The content of metallic elements in sapropel from Lake Pilvelis is mainly affected by the composition of mineral matter, not by the size of the particles.

中文翻译:

全新世金属的积累和淡水湖有机沉积物成分的变化

摘要 在拉脱维亚境内全新世形成的淡水环境中沉积的沉积物地层中的金属分布研究还不够充分。考虑到沉积物中大量有机质的积累,研究沉积物中金属元素的含量有助于确定湖泊系统中金属积累过程的特点和金属的生物地球化学循环。位于拉脱维亚东部(欧洲北部)的皮尔维利斯湖被选为主要研究地点。Pilvelis 湖是一个冰川成因的小湖,其洼地的 90% 以上充满了富含有机物的沉积物。自大约 10 年以来 Pilvelis 湖的发展阶段,通过使用多代理沉积记录重建全新世古环境条件,详细描述了 000 cal BP。分析腐泥中金属元素的元素组成和含量,主要目的是表征腐泥全剖面中金属的积累速率,并确定取决于湖泊演化和沉积物有机质成因的人为影响。表征沉积物的成分(如腐泥和金属元素)之间的相关性表明,元素分布可以根据与有机化合物(例如,Zn 和 Mn)和矿物化合物(对于 Ni)相关的元素的含量分为三大类、Co、Cr、K、Fe、Mg 和 Cu)。Ni 和 Co 部分与矿物化合物相关,部分与碳酸盐相关。主成分分析揭示了表明金属元素来源和沉积层金属积累趋势的主要因素:矿物质的输入、有机质的特征和人类的影响。皮尔维利斯湖腐泥中金属元素的含量主要受矿物成分的影响,而不受颗粒大小的影响。
更新日期:2020-04-01
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