Provenance, weathering, and metallogenic characteristics of lateritic soils in the Koubou district, Eastern Cameroon

IF 1.827 Q2 Earth and Planetary Sciences Arabian Journal of Geosciences Pub Date : 2025-03-15 DOI:10.1007/s12517-025-12231-3

Amaya Adama, Bisse Salomon Bertrant, Bokanda Ekoko Eric, Anyeku Njek Rexon, Boroh Andre William, Ngwang Nfor Bertrand

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Abstract

The lateritic soils in the Eastern region of Cameroon were subject to geochemical investigation in order to unveil their source rock composition, tectonic setting, past weathering intensity, climate type, and metallogenic properties. Source rock binary plots of Al₂O₃ vs. TiO₂, Th/Sc, La/Co, and Cr/Th indicates a felsic composition origin for the studied lateritic soils. The lateritic soils reflect a tectonic background of passive origin revealed by plots of Log (SiO₂ vs. K₂O/Na₂O), DF (A-P)MT, DF1 vs. DF2, and DF (A-P)M. The high plagioclase lixiviation and weathering displayed by the studied laterites are signpost by the plagioclase index of alteration (PIA) and chemical index of alteration (CIA) within a hot humid climatic condition. The hot humid conditions that existed during the laterites’ formation revealed by the PIA and CIA is also supported by trace element ratios f Rb/Sr Al₂O₃/MgO, Sr/Cu, Sr/Ba, and Fe₂O₃/MnO. The ternary plot of SiO₂-Al₂O₃-Fe₂O₃ coupled with the ternary plot of Al₂O₃-Fe2O3-MnO indicates that the studied lateritic soil is classified as metalliferous to terrigenous bauxitic clay with evidence of weak lateritization.

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喀麦隆东部库乌地区红土的物源、风化及成矿特征

对喀麦隆东部地区红土进行了地球化学调查，揭示了其烃源岩组成、构造背景、过去风化强度、气候类型和成矿性质。烃源岩中Al2O3与TiO2、Th/Sc、La/Co和Cr/Th的二元图表明，所研究的红土具有长硅质成分来源。由Log （SiO2 vs. K2O/Na2O）、DF (a - p)MT、DF1 vs. DF2和DF (a - p)M图反映了红土被动成因的构造背景。研究红土所表现出的高斜长石浸出和风化作用是在湿热气候条件下斜长石蚀变指数（PIA）和化学蚀变指数（CIA）的标志。PIA和CIA显示红土形成过程中存在的湿热条件也得到了Rb/Sr Al2O3/MgO、Sr/Cu、Sr/Ba和Fe2O3/MnO微量元素比值的支持。SiO2-Al2O3-Fe2O3三元图和Al2O3-Fe2O3-MnO三元图表明，研究的红土土属于含金属-陆源铝土矿粘土，具有弱红土化特征。

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来源期刊

Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-

自引率

0.00%

发文量

1587

审稿时长

6.7 months

期刊介绍： The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.