Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 12-16, 11000, Belgrade, Serbia.
Energy and Mineral Resources Group (EMR), Institute for Geology and Geochemistry of Petroleum and Coal, RWTH Aachen University, 52058, Aachen, Germany.
Environ Geochem Health. 2020 Feb;42(2):693-707. doi: 10.1007/s10653-019-00403-6. Epub 2019 Aug 24.
The objective of this study is geochronological investigation of sedimentological and inorganic composition, in the Danube Djerdap Lake sediments in order to obtain reliable information about former pollution. Eleven samples were taken from the 135-cm-deep sediment core drilled at the Orlova location. Since the core represents sediments deposited during 1972-2016, the sedimentation rate of ~ 3 cm year was estimated. Grain size, mineralogical and geochemical composition was determined. Sediments are sandy silts and clayey silts, and only the deepest and shallowest layers contain > 30% of sand-size fraction. The highest concentrations of minor elements are found in the oldest sediment (1972-1977) as a consequence of the high flux of the material from variable sources. During the sedimentation period (1975-1990), the concentrations of analyzed elements are generally decreasing until the beginning of 1990s. After this period, there are two distinct decreases and two distinct increases in concentrations of elements. The fluctuations in minor element concentrations are a consequence of both natural and anthropogenic sources. Granitic rocks situated south are source of minerals that carry minor elements. Enrichment Factor, Geoaccumulation Index, Contamination Factor and Pollution Load Index indicate that concentrations of certain minor elements at specific depositional periods have anthropogenic source.
本研究的目的是对多瑙河杰尔达普湖沉积物的沉积学和无机组成进行地质年代学研究，以获取有关过去污染的可靠信息。在奥洛娃（Orlova）地点钻取的 135 厘米深的岩芯中采集了 11 个样本。由于该岩芯代表了 1972-2016 年期间沉积的沉积物，因此估计沉积速率约为 3 厘米/年。对粒度、矿物学和地球化学组成进行了测定。沉积物为砂质粉砂和粉质粘土，只有最深和最浅的层含有>30%的砂级颗粒。由于来自不同来源的物质通量较高，因此在最古老的沉积物（1972-1977 年）中发现了次要元素的最高浓度。在沉积期间（1975-1990 年），分析元素的浓度总体呈下降趋势，直到 90 年代初。此后，元素浓度出现了两次明显的下降和两次明显的上升。微量元素浓度的波动是自然和人为来源共同作用的结果。位于南部的花岗岩岩石是携带微量元素的矿物质的来源。富集因子、地质累积指数、污染因子和污染负荷指数表明，在特定沉积时期某些微量元素的浓度具有人为来源。
