巢湖201个表层沉积物和53个深层沉积物样品的主要化学成分,中国,进行了分析。由于巢湖表层沉积物(0-2cm深)是现代沉积物,本文主要研究了巢湖深层沉积物(深度50-100cm)。对CH3和CH4柱沉积物样品进行了粒度分析和磁化强度测定。报告了CH-1柱沉积物样品的年龄确定数据。还对巢湖流域的岩石及其化学组成特征进行了系统的研究。本研究结果表明,4个正化学风化指标和1个负化学风化指标适用于巢湖的研究。巢湖沉积物的平均CIA小于65,表明巢湖流域经历了弱化学风化,古气候寒冷干燥。CH3和CH4柱状沉积物中平均粒径和磁化强度的垂直变化反映了巢湖沉积物沉积过程中沉积环境和气候的变化。CH-1柱沉积物样品的年龄数据直接表明了中国东部小冰期(公元1380-1880年)巢湖深层沉积物的沉积。Th/U,Sc/Th,Rb/Sr,Na2O/K2O,巢湖沉积物的CaO/MgO和OC/N比值反映了巢湖流域古气候特征和烃源岩的化学成分。CIA的相关性,CIW,PIA,和CIX以及化学组成比可提供有关古气候和化学组成分布的信息。CIA,CIW,PIA,和CIX与Cd无关,Pb,As,Hg,或者P.相反,CIA,CIW,PIA,和CIX与Cr和N呈显着正相关。WIP与所选化学成分不一致。因此,化学风化指标与四种重金属和两种富营养化相关元素的相关性研究意义不大。内陆湖深层沉积物化学风化特征的研究应与湖盆地质特征的评价相结合,特别是湖盆岩石的化学成分分析。
The main chemical compositions of 201 surface sediments and 53 deep sediment samples from Chaohu Lake, China, were analysed. Since the surface sediments (0-2 cm depth) in Chaohu Lake are modern sediments, this paper mainly focuses on the deep sediments (50-100 cm depth) in Chaohu Lake. Particle size analysis and magnetization determination of the CH3 and CH4 column sediment samples were carried out. The age determination data of the CH-1 column sediment samples are reported. A systematic study of the rocks and their chemical compositional characteristics in the Chaohu Lake Basin was also carried out. The results of this study show that four positive chemical weathering indicators and one negative chemical weathering indicator are applicable to the study of Chaohu Lake. The mean CIA of the Chaohu Lake sediments was less than 65, indicating that the Chaohu Lake Basin experienced weak chemical weathering and that the palaeoclimate was cold and dry. Vertical variations in the mean grain size and magnetization in the CH3 and CH4 columnar sediments reflect changes in the depositional environment and climate during deposition of the Chaohu Lake sediments. The age data from the CH-1 column sediment samples directly indicate deposition of the deep sediments in Chaohu Lake during the Little Ice Age in eastern China (AD 1380-1880). The Th/U, Sc/Th, Rb/Sr, Na2O/K2O, CaO/MgO and OC/N ratios of the Chaohu sediments reflect palaeoclimate characteristics and the chemical compositions of the source rocks in the Chaohu Lake basin. The correlations of the CIA, CIW, PIA, and CIX with the chemical compositional ratios provide information on the palaeoclimate and the distribution of the chemical compositions. The CIA, CIW, PIA, and CIX were not correlated with Cd, Pb, As, Hg, or P. In contrast, the CIA, CIW, PIA, and CIX were significantly positively correlated with Cr and N. The WIP was inconsistently correlated with the selected chemical components. Therefore, the study of the correlations of chemical weathering indicators with four heavy metals and two eutrophication-related elements is of little significance. The study of the chemical weathering characteristics of deep sediments of inland lakes should be combined with assessment of the geological characteristics of the lake basins, particularly the analysis of the chemical composition of the rocks in the lake basins.