Structural Investigation of Zungeru-Kalangai Fault Zone, Nigeria using
Aeromagnetic and Remote Sensing Data
Abstract
The aeromagnetic and satellite imagery data of the part of northcentral
Nigeria were processed to delineate subsurface structures, produced 2D
models of the structures within the study area with a view to
establishing the existence of the Zungeru-Kalangai fault zone
geophysically. The lineaments extracted from the Landsat-7 ETM+ imagery
are dense around Zungeru, Tegina and Gidan Karauku area in the
southwestern part of the study area, in the southeastern parts
particularly around Chikun area and also in the northern part around
Kwaimbana and Doka. The N-S, NNE-SSW and NE-SW lineament trends are
prominent on the Landsat-7 ETM+. The inferred faults delineated from the
aeromagnetic data showed that striking NE-SW trend is predominant. The
derived composite map of the inferred faults extracted from aeromagnetic
data and the surface lineaments delineated from the satellite imagery
superimposed on the existing faults revealed the presence of several
undetected faults cutting across the study area. The location and
orientation of the Zungeru/Kalangai fault zone in the northcentral part
of Nigeria which extend about 245 km, correlate with the existing fault
on the published geological map of Nigeria and showed that it possibly
projected to the study area through the basement within Bida Basin from
the southwestern part of Nigeria. The results of the 2D models confirmed
the existence of the Zungeru-Kalangai fault zone and other several new
faults such as faults f3 (northern part), f4 (located around Kaya in the
northeastern part of the study area), f6 and f9 (located around
Sengiakun area in the northwestern part of the study area) with their
approximate source locations and dips. Conclusively, these study confirm
geophysically the existence of the Zungeru-Kalangai fault zone which is
dipping NW and other unmapped major structures in the study area.