Integrating Landsat-ETM and Aeromagnetic Data for Enhanced Structural Interpretation over Naraguta Area, North-Central Nigeria [ READ ]
Opara Alexander. I., Onyekuru Samuel. O., Mbagwu Esther. C., Emberga Theophilus. T., Ijeomah Kingsley. C., and Nwokocha Kingsley.C.
Structural interpretation over Naraguta area was carried out using aeromagnetic and Landsat ETM data with the objective of delineating the linear features of the study. Several image processing and analytical techniques were applied to the aeromagnetic and landsat data to improve the data quality and resolution. Linear features identified in the study area revealed principal trend directions in the NW-SE, NE-SW, N-S and E-W directions with the N-S trend been dominant. Results of the 2-D spectral analysis of the aeromagnetic data revealed a two depth source model. The depth to the deeper magnetic source bodies has an average depth of 2.03km. This layer may be attributed to magnetic rocks of the basement, lateral variations in basement susceptibilities and intra- basement features like faults and fractures. The shallower magnetic sources with an average depth of 0.265km could be attributed to near surface magnetic sources, which are magnetic rocks which intruded into the sedimentary overburden. Most of the interpreted lineations were observed to correspond to the trends and positions of the trans-oceanic fracture zones in the area. There is also a marked correlation of the location of the Younger Granite Ring complexes and the lineaments in the study area. This observed relationship may be attributed to tectonic control of secondary mineralization in the study area. Most of the lineaments also correlated with the orientation of the drainage lines indicating that the drainage system in the area may be structurally controlled. Finally, the drainage pattern in the study area was observed to be dendritic which is indicative of lithological heterogeneity.
Opara Alexander. I., Onyekuru Samuel. O., Mbagwu Esther. C., Emberga Theophilus. T., Ijeomah Kingsley. C., and Nwokocha Kingsley.C.
Structural interpretation over Naraguta area was carried out using aeromagnetic and Landsat ETM data with the objective of delineating the linear features of the study. Several image processing and analytical techniques were applied to the aeromagnetic and landsat data to improve the data quality and resolution. Linear features identified in the study area revealed principal trend directions in the NW-SE, NE-SW, N-S and E-W directions with the N-S trend been dominant. Results of the 2-D spectral analysis of the aeromagnetic data revealed a two depth source model. The depth to the deeper magnetic source bodies has an average depth of 2.03km. This layer may be attributed to magnetic rocks of the basement, lateral variations in basement susceptibilities and intra- basement features like faults and fractures. The shallower magnetic sources with an average depth of 0.265km could be attributed to near surface magnetic sources, which are magnetic rocks which intruded into the sedimentary overburden. Most of the interpreted lineations were observed to correspond to the trends and positions of the trans-oceanic fracture zones in the area. There is also a marked correlation of the location of the Younger Granite Ring complexes and the lineaments in the study area. This observed relationship may be attributed to tectonic control of secondary mineralization in the study area. Most of the lineaments also correlated with the orientation of the drainage lines indicating that the drainage system in the area may be structurally controlled. Finally, the drainage pattern in the study area was observed to be dendritic which is indicative of lithological heterogeneity.
