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<p>This study examines the geochemical composition of shale and sandstones from the Carnot-Berberati Basin, in southwestern Central African Republic (CAR), with the aim of determining their provenance, diagenetic alteration, paleo-oxidation conditions, tectonic setting, and hydrocarbon generation. The methods used were ICP-OES, ICP-MS, LECO C230, and Rock–Eval pyrolysis. The Calculated Plagioclase Index of Alteration (PIA 97.01–99.42), Chemical Index of Alteration (CIA 76.38–99.04), and Chemical Index Weathering (CIW 97.20–99.42). Suggest intense weathering conditions source rocks of the Cretaceous shales and sandstones. The major and trace elements primarily indicate a felsic igneous provenance with minimal contribution from intermediate to mafic sources and sedimentation influenced by climate changes. High LREE/HREE ratios (3.49–20.90) and Eu anomalies (Eu/Eu* = 0.76–1.20) suggest a dominant felsic igneous source with minor mafic contributions. Tectonic discrimination diagrams (SiO<sub>2</sub>-K<sub>2</sub>O/Na<sub>2</sub>O, Th-Sc-Zr/10) classify the sediments as originating from an active continental margin. Additionally, elemental ratios such as Ni/Co, U/Th, and Cu/Zn further support the interpretation that the rocks belong to an active continental margin, as indicated by the tectonic discrimination diagrams. The low Total Organic Carbon (TOC) content of the shale samples, ranging from 0.01–0.27%, indicates poor organic richness and limited hydrocarbon potential. The geochemical data overall emphasize that the sediments are sourced from felsic provenance, varied alteration, active margin deposition, and minimal hydrocarbon potential.</p>

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Geochemical constraints on provenance history, tectonic setting, and hydrocarbon generation potential of detrital deposits from the Carnot Berberati Basin, Southwest Central African Republic

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  • 发表日期：

    2025年11月10日

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  • Francis Thierry Togozo,
  • Olugbenga Ademola Boboye,
  • Milan Stafford Tchouatcha,
  • Rene Toyama,
  • Adesina Mutiu Adeleye,
  • Anas Mohamed Abaker Babai,
  • Mbouemboue Nsangou Moussa Ahmed,
  • Christel Sobdjou-Kemteu,
  • Prince Emilien Danguene Yedidja

摘要

This study examines the geochemical composition of shale and sandstones from the Carnot-Berberati Basin, in southwestern Central African Republic (CAR), with the aim of determining their provenance, diagenetic alteration, paleo-oxidation conditions, tectonic setting, and hydrocarbon generation. The methods used were ICP-OES, ICP-MS, LECO C230, and Rock–Eval pyrolysis. The Calculated Plagioclase Index of Alteration (PIA 97.01–99.42), Chemical Index of Alteration (CIA 76.38–99.04), and Chemical Index Weathering (CIW 97.20–99.42). Suggest intense weathering conditions source rocks of the Cretaceous shales and sandstones. The major and trace elements primarily indicate a felsic igneous provenance with minimal contribution from intermediate to mafic sources and sedimentation influenced by climate changes. High LREE/HREE ratios (3.49–20.90) and Eu anomalies (Eu/Eu* = 0.76–1.20) suggest a dominant felsic igneous source with minor mafic contributions. Tectonic discrimination diagrams (SiO2-K2O/Na2O, Th-Sc-Zr/10) classify the sediments as originating from an active continental margin. Additionally, elemental ratios such as Ni/Co, U/Th, and Cu/Zn further support the interpretation that the rocks belong to an active continental margin, as indicated by the tectonic discrimination diagrams. The low Total Organic Carbon (TOC) content of the shale samples, ranging from 0.01–0.27%, indicates poor organic richness and limited hydrocarbon potential. The geochemical data overall emphasize that the sediments are sourced from felsic provenance, varied alteration, active margin deposition, and minimal hydrocarbon potential.