Pinna, P., Calvez, J. Y., Abessolo, A., Angel, J. M., Mekoulou, T., Mananga, G., & Vernhet, Y. (1994). Neoproterozoic Events in the Tcholliré Area: Pan-African Crustal Growth and Geodynamics in Central-Northern Cameroon (Adamawa and North Provinces). Journal of African Earth Sciences, 18, 347-353.
https://doi.org/10.1016/0899-5362(94)90074-4

has been cited by the following article:

• TITLE: ASTER Data Processing by Discrete Wavelets Transform and Band Ratio Techniques for the Identification of Lineaments and Hydrothermal Alteration Zones in Poli, North Cameroon

  AUTHORS: Mohamadou Ahamadou, May Nome Stella, Meying Arsène

  KEYWORDS: Discrete Wavelets Transform, Band Ratio, Lineaments, Hydrothermal Alteration

  JOURNAL NAME: Journal of Geoscience and Environment Protection, Vol.11 No.9, September 25, 2023

  ABSTRACT: The aim of this study is to carry out hydrothermal alteration mapping and structural mapping using ASTER images in order to identify indices that could guide mining exploration work in the Poli area and its surroundings. To achieve this, the ASTER images were first preprocessed to correct atmospheric effects and remove vegetation influence. Secondly, a lineament mapping was conducted by applying Discrete Wavelet Transform (DWT) algorithms to the First Principal Component Analysis (PCA1) of Visible Near-Infrared (VNIR) and Shortwave Infrared (SWIR) bands. Lastly, band ratio methods were applied to the VNIR, SWIR, and Thermal Infrared (TIR) bands to determine indices of iron oxides/hydroxides (hematite and limonite), hydroxyl-bearing minerals (chlorite, epidote, and muscovite), and the quartz index. The results obtained showed that the lineaments were mainly oriented NE-SW, ENE-WSW, and E-W, with NE-SW being the most predominant direction. Concerning hydrothermal alteration, the identified indices covered almost the entire study area and showed a strong correlation with lithological data. Overlaying the obtained lineaments with the hydrothermal alteration indices revealed a significant correlation between existing mining indices and those observed in the field. Mineralized zones generally coincided with areas of high lineament density exhibiting significant hydrothermal alteration. Based on the correlation between existing mining indices and the results of hydrothermal and structural mapping, the results obtained can then be used as a reference document for any mining exploration in the study area.