Linear features interpreted over parts of the younger granite complex, North Central Nigeria using HRAM and LANDSAT-ETM data

Nwokocha Kingsley Chiemela, Opara Alexander Iheanyi, Onyekuru Samuel Okechukwu, Okereke Chikwendu Njoku, Emberga Terhemba Theophilus, Ugwuegbu Emmanuel Ikechukwu, Ijeomah Kingsley Chidubem

Abstract


A detailed structural interpretation of part of the Younger Granite Complex North-central Nigeria was carried out using high resolution aeromagnetic(HRAM) and Landsat-ETM data  to determine the magnetic basement depth, delineate the basement morphology and relief, delineate the structural features associated with the basin and to infer the effects of such structures on the general tectonic history of the study area. Various image and data enhancement and transformation routines were carried out on the aeromagnetic and landsat data to spectrally filter out unwanted signals. Results of the study revealed lineaments with trend directions in the NW-SE, NE-SW, N-S and E-W directions with the NW-SE and NE-SW trends being the dominant trends in the area. Results of the 2-D spectral analysis revealed two layers depth model. The  deeper magnetic source bodies (d2) varies from 0.518km to 8.65km with an average depth of 3.513km while the depth of the shallower magnetic source bodies (d1) ranges from 0.0568km to 0.9885km with an average depth of 0.5118km. The shallower magnetic anomalies are however believed to be as the result of basement rocks which intruded into the sedimentary rocks while the deeper layer may be attributed to intra-basement discontinuities like faults. Structural analysis of these shallow anomalies using 3-D Euler deconvolution with structural index values ranging from 0-3, revealed three main structural models which include spheres, pipes/cylinders, and sills/dikes,There is a strong positive correlation between the two depth estimation methods used in this research. The relationship between lineament densities and Younger granites occurrences in the study area is an indication of tectonic control probably associated with paleo-tectonic structures in the study area acting as conduits for primary mineralization. This correlation is an indication that the emplacement of the Younger granite ring complexes may be associated with epeirogenic uplift.

Keywords


Lineaments; HRAM; Landsat-ETM; Spectral analysis; Magnetic basement depth; Euler deconvolution; Structural index; Younger granite; Nigeria

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References


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