Lineament and Tectonic Interpretation Over Abakiliki Area: Evidences from Airborne Magnetic and Landsat ETM Data

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Research areas:
Year:
2015
Type of Publication:
Article
Keywords:
Aeromagnetic, Landsat-ETM, Lineaments, Basement Depth, Abakaliki Anticlinorium, Benue Trough
Authors:
A. I. Opara; Onyekuru. S. O.; A. G. Essien; R. A. Onyewuchi; A. C. Okonkwo; T. T. Emberga; O. P. Nosiri
Journal:
IJRIES
Volume:
2
Number:
4
Pages:
111-121
Month:
July
BibTex:
Abstract:
Geological interpretation over Abakaliki anticlinorium using aeromagnetic and Landsat imagery was carried out to determine the structural and tectonic features associated with the area as well as their geological implications on the basin. The aeromagnetic and Landsat data were subjected to various image and data enhancement and transformation routines to improve their spatial and spectral resolutions. of the study revealed that lineaments identified in the study area have principal trend directions in the NE-SW, NW-SE, N-S and E-W directions with the NE-SW trend direction been the dominant. High lineament density was observed around Ofurekpe-Abakaliki-Ndiokpoto and Enyigba-Ameri axes. The high lineament density in these areas was observed to be related to the presence of shallow intrusive bodies which intruded into the sediments. High lineament frequencies were therefore observed in areas where basement rocks outcrop or are closer to the surface, whereas low lineament frequencies were revealed in areas characterized by deeply buried basement rocks Results of the 2-D spectral analysis reveal a two layer depth model for the area. The depth to the deeper magnetic source bodies (D2) ranges between 2.461km to 3.299km, with an average of 2.904km. The depth to shallower magnetic source bodies (D1) is the range of 0.348km to 1.843km, with an average of 1.066km. Finally, the average depth of 2.904km is not thick enough to support hydrocarbon accumulation and exploitation.

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