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<p>The Ntem Complex is a well<b>-</b>known Province in Cameroon hosting a wide variety of mineralizations. This study investigates the mineralization potential, provenance and depositional setting of gold<b>-</b>bearing stream sediments from the Bipindi<b>‒</b>Kouambo prospect in Cameroon. Bulk stream sediment samples were collected and analyzed geochemically using the inductively coupled plasma<b>-</b>mass spectrometry method. The sediments demonstrate mean concentrations of Fe, P, Ti, Au, Ag, U, Th, Bi and La greater than upper continental crust (UCC) thresholds and plot above the UCC on UCC<b>-</b>normalized plots, suggesting potential mineralizations. Al<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> ratio (0.17&#xa0;–&#xa0;8.27), Sc vs. Th, Th/Sc vs. La/Sc*100 and La/Cr vs. Th/Cr*100 source discrimination systematics show predominantly a mafic geogenic origin for the sediments. The sediments demonstrate low values of ICV (0.22&#xa0;–&#xa0;0.83), very high weathering indices values (PIA: 85.49&#xa0;–&#xa0;99.39, CIW: 86.45&#xa0;–&#xa0;99.39, CIA: 81.09&#xa0;–&#xa0;98.52 &amp; MIA: 62.18&#xa0;–&#xa0;97.03), potentially indicating severe chemical weathering and maturity of the sediments. Sr/Ba ratio (0.09 ‒ 0.55), CIA vs. Al<sub>2</sub>O<sub>3</sub>, Ba vs. Sr/Ba, K<sub>2</sub>O/Al<sub>2</sub>O<sub>3</sub> vs. Ga/Rb and Rb vs. Rb/Sr cross<b>-</b>plots indicate sediments deposition under humid climatic condition. V/Cr (0.46&#xa0;–&#xa0;1.73), Ni/Co (0.92&#xa0;–&#xa0;4.83) and U/Th (0.02&#xa0;–&#xa0;0.05) ratios, as well as Ni/Co vs. V/(V + Ni) and Ni/Co vs. V/Cr cross<b>-</b>plots reveal an oxic environment of deposition. Also, the Log(MgO/Al<sub>2</sub>O<sub>3</sub>) vs. log(K<sub>2</sub>O/Al<sub>2</sub>O<sub>3</sub>) and MgO vs. Fe<sub>2</sub>O<sub>3</sub> diagrams show a non<b>-</b>marine depositional environment. The Au, Ag, W and Pb association in the studied sediments are the suggested pathfinders for primary orogenic gold in this study. This study provides baseline geochemical data for follow<b>-</b>up mineral exploration in the Bipindi<b>‒</b>Kouambo prospect, Cameroon.</p>

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Geochemistry of alluvial sediments from the Bipindi–Kouambo prospect (Cameroon): provenance, depositional environment and mineralization potential

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Bertrand Kehding Fomekong,
  • Gus Djibril Kouankap Nono,
  • Ngambu Aloysius Afahnwie,
  • George Yuh Ngong,
  • Nicoline Kibong Fontem,
  • Lemnyuy Prosper Yiika,
  • Pierre Wotchoko

摘要

The Ntem Complex is a well-known Province in Cameroon hosting a wide variety of mineralizations. This study investigates the mineralization potential, provenance and depositional setting of gold-bearing stream sediments from the Bipindi‒Kouambo prospect in Cameroon. Bulk stream sediment samples were collected and analyzed geochemically using the inductively coupled plasma-mass spectrometry method. The sediments demonstrate mean concentrations of Fe, P, Ti, Au, Ag, U, Th, Bi and La greater than upper continental crust (UCC) thresholds and plot above the UCC on UCC-normalized plots, suggesting potential mineralizations. Al2O3/TiO2 ratio (0.17 – 8.27), Sc vs. Th, Th/Sc vs. La/Sc*100 and La/Cr vs. Th/Cr*100 source discrimination systematics show predominantly a mafic geogenic origin for the sediments. The sediments demonstrate low values of ICV (0.22 – 0.83), very high weathering indices values (PIA: 85.49 – 99.39, CIW: 86.45 – 99.39, CIA: 81.09 – 98.52 & MIA: 62.18 – 97.03), potentially indicating severe chemical weathering and maturity of the sediments. Sr/Ba ratio (0.09 ‒ 0.55), CIA vs. Al2O3, Ba vs. Sr/Ba, K2O/Al2O3 vs. Ga/Rb and Rb vs. Rb/Sr cross-plots indicate sediments deposition under humid climatic condition. V/Cr (0.46 – 1.73), Ni/Co (0.92 – 4.83) and U/Th (0.02 – 0.05) ratios, as well as Ni/Co vs. V/(V + Ni) and Ni/Co vs. V/Cr cross-plots reveal an oxic environment of deposition. Also, the Log(MgO/Al2O3) vs. log(K2O/Al2O3) and MgO vs. Fe2O3 diagrams show a non-marine depositional environment. The Au, Ag, W and Pb association in the studied sediments are the suggested pathfinders for primary orogenic gold in this study. This study provides baseline geochemical data for follow-up mineral exploration in the Bipindi‒Kouambo prospect, Cameroon.