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Integrated Landsat Imagery and Geophysical Exploration for Groundwater Potential Evaluation of Okene and Its Environs, Southwestern Nigeria

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International Journal of Geosciences 2015年第3期6卷 209-229页

作者： John Olurotimi Amigun richard ajibola faruwa Akinola Adesuji Komolafe Department of Applied Geophysics Federal University of Technology Akure Akure Nigeria Department of Remote Sensing and Geoscience Information System Federal University of Technology Akure Akure Nigeria

In this study, an integrated remote sensing and geophysical (aeromagnetic and geo-electric) methods was employed to assess the potential of groundwater in a basement complex terrain of Okene and its environs, Southwestern, Nigeria. Landsat imagery acquired over the study area was processed in the Geographic Information Systems (GIS) environment to delineate the surface lineaments, drainage networks and their orientations. Aeromagnetic data over the area were analyzed and its derivative maps were interpreted to further map the structures and the geology in the subsurface;depths to magnetic sources were determined using spectral analysis. Vertical Electrical Sounding (VES) of geo-electric method was interpreted to map the subsurface geology layers. The results of the integrated data were correlated with borehole yield data of the area for effective interpretation. Delineated lineaments from the azimuth, frequency plot showed dominant trends in the NE-SW and NNE-SSW directions. Radial average power spectrum revealed the depth to magnetic sources between 100 and 2500 m and the interpreted VES data characterized the area into three to four subsurface layers. In correlating the results with borehole yield data, the zones with high lineament density and low/negative magnetic anomaly were categorized as high groundwater potential zones while areas with low lineament density and high/positive magnetic anomaly as low groundwater potential zones. This study will guide efficiently subsequent groundwater drilling program in the study area.

关键词： Groundwater Basement Complex Aeromagnetic Geo-Electrics Remote Sensing GIS

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Some Experiences of Resistivity and Induced Polarization Methods on the Exploration of Sulfide: A Review

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Journal of Geoscience and Environment Protection 2020年第11期8卷 68-92页

作者： Claire Dusabemariya Wei Qian Romuald Bagaragaza ajibola richard faruwa Mossad Ali School of Earth Sciences and Engineering Hohai University Nanjing China College of Water Conservancy and Hydropower Engineering Hohai University Nanjing China Civil Environmental and Geomatics Engineering Department College of Science and Technology University of Rwanda Kigali Rwanda

Sulfide minerals are a group of compounds with the presence of sulfur. This group’s most abundant and economically members are pyrites, pyrrhotite, chalcocite, galena, sphalerite, and the group of copper sulfides minerals. Resistivity and Induced Polarization (IP) methods, which play an essential role in mineral exploration, showed great success in sulfide exploration. This paper started on reviewing sulfide formation by giving details which help to understand their genesis better. To make the reader understand the procedures and appropriate mineral exploration methods, we have briefly covered the theory, the basic principles of resistivity and IP methods, and different investigation techniques using one, two, and three-dimensional surveys. Based on many electrical surveys, we discussed with examples of resistivity and IP methods applied to the exploration of sulfide deposits: the data inversion and interpretation of the geophysical signatures of most of the sulfide deposits in various geological environments were analyzed and end by showing both successful surveys and limitations of the methods.

关键词： Resistivity Induced Polarization Chargeability Sulfides Mineralization

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