The Lobé River (LR) watershed basement rock, Ntem Complex (NC), south Cameroon is covered by a thick lateritic soil. To better constrain the geology of the basement rock, textural, mineralogical and bulk geochemical (major, trace, and rare earth elements) analyses were undertaken on the recent stream sediments from the LR. The aims of this study were to investigate the provenance of sediments and to determine the weathering intensity of the source area. The ternary (Al₂O₃–TiO₂–Zr) and binary (Th/Sc–Zr/Sc) diagrams suggested high sediment recycling and sorting, indicating that the bulk hydraulic energy of the LR controls the sediment texture. Despite the diagenetic processes of K-metasomatism observed on the A-CN-K plot, the (A-K)-C-N plot, Chemical Index of Alteration (CIA), and Plagioclase Index of Alteration (PIA) indicate that the studied sediments and their source areas underwent a high degree of chemical weathering. The heavy mineral suites imply heterogeneous provenance, including igneous, metamorphic and sedimentary source rocks. The ternary diagrams and Co/Th, La/Sc, Sc/Th, Cr/V, and Y/Ni elemental ratios indicate mostly felsic source rocks with lesser contribution from mafic components. The comparison of chondrite normalized REE patterns of LR sediments with potential source rocks reveals that the sediments were derived from the Precambrian basement rocks composed of tonalitic, trondhjemitic, and granodioritic suites, with remnants derived from Archean Greenstone Belt.

喀麦隆南部的洛贝河 (LR) 分水岭基底岩 Ntem Complex (NC) 被厚厚的红土覆盖。为了更好地限制基底岩的地质，对来自 LR 的近期河流沉积物进行了结构、矿物学和大块地球化学（主要、微量和稀土元素）分析。本研究的目的是调查沉积物的来源并确定源区的风化强度。三元 (Al ₂ O ₃ –TiO ₂–Zr) 和二元 (Th/Sc–Zr/Sc) 图表明沉积物回收和分选率高，表明 LR 的整体水力能控制沉积物质地。尽管在 A-CN-K 图上观察到 K-交代作用的成岩过程，但 (AK)-CN 图、化学蚀变指数 (CIA) 和斜长石蚀变指数 (PIA) 表明所研究的沉积物及其来源地区经历了高度的化学风化。重矿物组意味着非均质物源，包括火成岩、变质岩和沉积烃源岩。三元图和 Co/Th、La/Sc、Sc/Th、Cr/V 和 Y/Ni 元素比表明主要是长英质烃源岩，基性成分的贡献较小。