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Integrated Geophysical Investigation using Aero-radiometric and Electrical Methods for Potential Gold mineralization within Yauri/Zuru Schist Belts, Kebbi State NW Nigeria
Investigación geofísica integrada de prospección aerorradiométrica y métodos eléctricos para definir el potencial de mineralización aurífera en el cinturón de esquistos de Yauri/Zuru, en el estado de Kebbi, en el noroeste de Nigeria
DOI:
https://doi.org/10.15446/esrj.v28n2.112066Keywords:
Gold mineralization Zones, Yauri/Zuru Schist Belt, Aero-radiometric, Electrical Resistivity Tomography (ERT), Induce Polarization (IP) (en)zonas de mineralización aurífera, cinturón de esquisto Yauri/Zuru, prospección aerorradiométrica, tomografía 2D de resistividad eléctrica, polarización inducida (es)
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This study used aero-radiometric, 2D electrical resistivity tomography (ERT), and induced polarization (IP) methods to delineate gold mineralization potential. The study also confirmed and followed-up on regions with major structural features identified in previous aeromagnetic studies in the area. A half-degree airborne radiometric data of sheet 118_Yelwa from the NGSA, which contains three radioelements (%K, eTh, and eU) were used in this study. These datasets were processed and analyzed with Oasis Montaj Grid Math expression builder to obtain the %K_ratio_eTh and Ternary grid anomalies. The results identified zones E and F as hydrothermally altered regions that may harbour gold mineralization. These findings were consistent with the regions of major structural features identified in previous aeromagnetic studies in the area. The zones were located in the eastern parts of Ngaski, Yauri (Yelwa), Shanga, and Agwara, as well as Magama's northwest region. However, zone F1 (the eastern portion of Ngaski/Yauri) has been further investigated using 2ERT and IP detailed geophysical methods in a dipole-dipole configuration. The results of geoelectric techniques along profiles 1, 2, and 3 identified the major gold mineralization potential zones, which were labeled A1, A, and C. These regions have low/high resistivity and chargeability signatures, and could thus be interpreted as potential target zones for metallic mineral exploration, particularly gold mineralization. The regions are located in the northern part of Mararraba and southwest of the Jinsani areas of Kebbi State.
Este estudio utiliza los métodos de prospección aerorradiométrica, tomografía 2D de resistividad eléctrica (ERT), y polarización inducida (IP) para delinear el potencial de mineralización aurífera en el estado de Kebbi, al noroeste de Nigeria. Este trabajo también confirmó e hizo seguimiento a estudios con características estructurales identificadas en previos análisis aeromagnéticos en el área. Con este fin se utilizaron datos radiométricos aerotransportados de medio grado de la pestaña 118_Yelwa, de la Agencia de Estudios Geológicos de Nigeria, la cual contiene tres radioelementos (%K, eTh, y eU). Estos conjuntos de datos fueron procesados y analizados con el software de expresiones matemáticas Oasis Montaj Grid Math para obtener las anomalías de la red %K_ratio_eTh y Ternary. Los resultados identificaron las zonas E y F como regiones hidrotérmicamente alteradas que podrían albergar mineralizaciones auríferas. Estos hallazgos son consistentes con las regiones de mayores características estructurales identificadas en previos estudios aeromagnéticos en el área. Estas zonas corresponden con las partes del este de Ngaski, Yauri (Yelwa), Shanga y Agwara, al igual que con la región noroeste de Magama. Sin embargo, la zona F1 (la parte más al este de Ngaski/Yauri) fue investigada más detalladamente con los métodos ERT e IP en una interacción dipolo-dipolo. Los resultados de las técnicas geoeléctricas en los perfiles 1, 2 y 3 identificaron las zonas de mayor potencial de mineralización aurífera, las cuales fueron etiquetadas como A1, A, y C. Estas áreas tienen características de alta/baja resistividad y cargabilidad, por lo que podrían interpretarse como zonas potenciales para la exploración de minerales metálicos, particularmente de mineralización de oro. Estas regiones se ubican en el norte de Mararraba y en el sudoeste de Jinsani, estado de Kebbi.
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