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<p>Stream sediment geochemistry is a key tool for mineral exploration in deeply weathered tropical environments. This study investigates the Abiete-Toko Gold District (Nyong Complex, southern Cameroon) to constrain sediment provenance, weathering intensity, and gold dispersion patterns. Thirteen stream sediment samples from the <i>Kienké</i> and <i>Tchangué</i> watersheds were analysed using X-ray diffraction (XRD) and ICP-AES/ICP-MS. The sediments are dominated by quartz and phyllosilicates, with accessory garnet and ilmenite indicating contributions from high-grade metamorphic and mixed felsic to mafic–ultramafic sources. High Chemical Index of Alteration values (CIA = 94.64–99.34%), together with elevated Plagioclase Index of Alteration (PIA = 92.26–99.01%) and Chemical Index of Weathering (CIW = 91.28–99.12%), reflect intense chemical weathering, while the Index of Compositional Variability indicates geochemical immaturity. Trace element signatures support a heterogeneous provenance with significant contributions from meta-volcano-sedimentary units. Gold concentrations range from low to moderate but exhibit localized anomalies (up to 60.8 ppb), suggesting discrete upstream mineralised sources. The watershed-based approach highlights a strong link between lithological variability and gold distribution, enabling the delineation of priority exploration targets.</p>

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Geochemical and mineralogical characterisation of stream sediments in the Abiete-Toko Gold District (Nyong complex, SW-Cameroon): delineation of high-potential gold areas using geochemical dispersion fingerprints

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Mary Immaculate Neh Fru,
  • Jean Paul Sep Nlomgan,
  • Eugène Pascal Binam Mandeng,
  • Augustin Patrice Moussango Ibohn,
  • Stella May Nome,
  • Roger Fils Thomas Tchatchoua,
  • Ashukem Ethel Nkongho,
  • Jacques Wassouo Wadjou,
  • Louise Marie Ngo Bidjeck Bondjè,
  • Lucien Dieudonné Bitom

摘要

Stream sediment geochemistry is a key tool for mineral exploration in deeply weathered tropical environments. This study investigates the Abiete-Toko Gold District (Nyong Complex, southern Cameroon) to constrain sediment provenance, weathering intensity, and gold dispersion patterns. Thirteen stream sediment samples from the Kienké and Tchangué watersheds were analysed using X-ray diffraction (XRD) and ICP-AES/ICP-MS. The sediments are dominated by quartz and phyllosilicates, with accessory garnet and ilmenite indicating contributions from high-grade metamorphic and mixed felsic to mafic–ultramafic sources. High Chemical Index of Alteration values (CIA = 94.64–99.34%), together with elevated Plagioclase Index of Alteration (PIA = 92.26–99.01%) and Chemical Index of Weathering (CIW = 91.28–99.12%), reflect intense chemical weathering, while the Index of Compositional Variability indicates geochemical immaturity. Trace element signatures support a heterogeneous provenance with significant contributions from meta-volcano-sedimentary units. Gold concentrations range from low to moderate but exhibit localized anomalies (up to 60.8 ppb), suggesting discrete upstream mineralised sources. The watershed-based approach highlights a strong link between lithological variability and gold distribution, enabling the delineation of priority exploration targets.