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<p>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 Al<sub>2</sub>O<sub>3</sub> vs. TiO<sub>2</sub>, 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 (SiO<sub>2</sub> vs. K<sub>2</sub>O/Na<sub>2</sub>O), 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 Al<sub>2</sub>O<sub>3</sub>/MgO, Sr/Cu, Sr/Ba, and Fe<sub>2</sub>O<sub>3</sub>/MnO. The ternary plot of SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-Fe<sub>2</sub>O<sub>3</sub> coupled with the ternary plot of Al<sub>2</sub>O<sub>3</sub>-Fe2O3-MnO indicates that the studied lateritic soil is classified as metalliferous to terrigenous bauxitic clay with evidence of weak lateritization.</p>

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

  • 期刊论文

  • 发表日期：

    2025年3月15日

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

摘要

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.