Ebolowa市政湖(EML)(喀麦隆南部),以确定湖泊中发生的早期成岩过程及其影响因素。为此,收集了21个样品。在原地,氢电势,氧化还原电位,电导率,溶解氧含量,并测量浊度。在实验室里,通过X射线衍射对样品进行矿物学分析,X射线荧光和ICP-MS地球化学分析,和统计分析。根据地球化学数据计算变异系数(Qi)。在水柱中,OD>2mg/L,pH>7且Eh<0mV。在沉积物中:pH<7,Eh值较低。含量2.08≤TOC≤12.65%。矿物学队伍由石英组成,高岭石,Gibbsite,针铁矿,和菱铁矿。后者仅存在于EML中。沉积物以SiO2为主(60.44-89.47%),Al2O3(6.55-18.17%),和Fe2O3(1.15-6.21%)。Qi值的范围从0.73到2.31。Mn/Fe比值低于0.40。对于Al,Qi>1,Fe,Mn,Mg,K,Na,P,Ni,Co,Zn,Pb,Cd,Cu,Ba,V,对于Si,Qi<1;对于Ca,Qi=1。层次聚类分析显示了两组:第一组包括来自中部和西部的样本,而第二个包括来自湖的东部和南部。水柱有有氧条件,而沉积物是缺氧的.氧气的快速消耗是由于有机矿化,这是在湖中观察到的主要成岩作用。这种现象在湖的西部更加突出。
The
Ebolowa Municipal Lake (EML) (South Cameroon) in order to identify the early diagenesis processes taking place in the lake and the factors influencing them. To this end, 21 samples were collected. In situ, hydrogen potential, redox potential, conductivity, dissolved oxygen content, and turbidity were measured. In the laboratory, the samples were subjected to mineralogical analysis by X-ray diffraction, geochemical analysis by X-ray fluorescence and ICP-MS, and statistical analysis. The coefficient of variation (Qi) was calculated from the geochemical data. In the water column, OD > 2 mg/L, pH > 7 and Eh < 0 mV. In sediments: pH < 7, Eh values are lower. The contents of 2.08 ≤ TOC ≤ 12.65%. The mineralogical procession consists of quartz, kaolinite, gibbsite, goethite, and siderite. The latter is only present in the EML. The sediments are dominated by SiO2 (60.44-89.47%), Al2O3 (6.55-18.17%), and Fe2O3 (1.15-6.21%). The Qi values range from 0.73 to 2.31. The Mn/Fe ratio values are below 0.40. Qi > 1 for Al, Fe, Mn, Mg, K, Na, P, Ni, Co, Zn, Pb, Cd, Cu, Ba, and V, and Qi < 1 for Si; Qi = 1 for Ca. The hierarchical cluster analysis shows two groups: the first one includes the samples from the central and western parts, while the second one includes those from the eastern and southern parts of the lake. The water column is subject to oxic conditions, while the sediments are anoxic. The rapid consumption of oxygen is due to organic mineralization, which is the main diagenesis observed in the lake. This phenomenon is more accentuated in the western part of the lake.