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From

Use of Landsat 7 ETM+ Data for the Geological Structure Interpretation: Case Study of the Ngoura-Colomines Area, Eastern Cameroon

Jonas Didero TAKODJOU WAMBO, Sylvestre GANNO, Aloysius AFAHNWIE NGAMBU, Emmanuel NOMO NEGUE, Joseph MVONDO ONDOA, Jean Paul NZENTI

Journal of Geosciences and Geomatics. 2016, 4(3), 61-72 doi:10.12691/jgg-4-3-3
  • Figure 1. Location of area of study: A) Administrative map of Cameroon; B) Administrative map of the eastern region of Cameroon; C) Digital elevation model of the study area
  • Figure 2. Pre-drift reconstruction of Pan-African and Brasiliano terranes (modified from [19]): CCSZ: Central Cameroon Shear Zone; SF: Sanaga Fault; TF: Tibati Fault; PF: Patos Fault
  • Figure 3. Geologic map of Cameroon [12] showing the location of the Ngoura-Colomines area and the main lithotectonic domains: (1) southern domain; (2) central domain; (3) northern domain;; BOSZ: Bétaré-Oya Shear Zone; SF: Sanaga Fault; TBF: Tibati-Banyo Fault; NT: Ntem complex; DS: Dja Series; NS: Nyong Series
  • Figure 4. Geologic map of the studied area (modified from [31])
  • Figure 5. RGB 754 coloured composition image of the area of study area
  • Figure 6. Major tectonic accidents depicted by the Sobel filtering and the Yésou et al. [37] gradient applied to the PCA 1 image and associated directional rosette
  • Figure 7. Structural map of the Ngoura-colomines area obtained from the analysis of Landsat 7 ETM+ images
  • Figure 8. Geologic map of the Ngoura-Colomines area obtained from the combined field-based and remote sensing methods
  • Figure 9. Morphostructural map of Ngoura-Colomines area showing the principal shear zone (C) and the Riedel faults system (P, P′, R and R′)
  • Figure 10. Histogram showing the distribution frequency of lineaments
  • Figure 11. Structures identified during the field (a) Boudin of amphibolite encased in mylonitic foliation (b) Lithologic banding with intrafolial boudinage (c) Conjugated shearing, note the chocolate bar structure (d) Sinistral shearing structures (e) Brittle structures