Structures deduced from gravity data in the Middle Benue, Nigeria

Existence of subsurface structures from aeromagnetic data interpretation of the crustal architecture around Ibi, Middle Benue, Nigeria

“…The fault is parallel to the axis of the interpreted folds in zone I and is therefore regarded to be a strike-slip fault. The interpreted fault may in fact be attributed to the Giza fault suggested by Ajayi and Ajakaiye [43] around the study area. Additionally, the occurrence of this anomaly is consistent with vein structures which stretch for 5 to 6 km at Bukuyu village in Ibi [42,44].…”

“…The anomalies within this zone are thin and trend E-W and NE-SW. As a result of the pattern of formation and magnitude of the anomalies, we interpret these anomalies as buried volcanic intrusions such as dykes and sills within the sedimentary formations. Such intrusions have been confirmed and established by drilling to exist around the region [43]. Also, Chukwu [46,47] confirmed the existence of such volcanic intrusions through field geologic mapping around the area, while Oden [42] suggested sediment-hosted barite occurrences of hydrothermal origin in Gidanwaya of Ibi area.…”

“…The minor N-S and NW-SE trends are more visible on the 3D analytic signal map shown in Fig. 7b; this pattern has been documented to be associated with barites mineralization [42,43]. The NE-trending structural features are almost elliptical in shape, and its magnitude is higher than the associated structural features.…”

Geophysical signature of geological units inferred from the analysis of geoid maps in Cameroon and its surroundings

“…The most relevant geophysical study based on seismic refraction (Dorbath et al, 1986) reveals a crustal thinning in part of this area. The positive residual Bouguer anomalies are due to the intrusions of igneous rocks or a shallow basement (Collignon, 1968;Ngounouno et al, 1997), while the negative anomalies are attributed to Cretaceous sediments with thicknesses ranging from 4 km (Kamguia et al, 2005) to 6 km (Elf-Serepca, 1981; Ajayi and Ajakaiye, 1985). The Central African Shear Zone (CASZ) is a major tectonic feature of Africa extending from the Darfur in Sudan across central Africa to the Adamawa Plateau region (Dorbath et al, 1986).…”

Crustal structure of southern Benue Trough, Nigeria from 3D inversion of gravity data

“…The magmatic activity in the Benue Trough predated its tectonic evolution (Maluski et al, 1995). The volcanic intrusions are interpreted in the region from gravity and magnetic data and are distributed beyond surface exposure which is believed to restrict the economic development of some parts of the region (Adighije, 1981;Ajayi and Ajakaiye, 1981;1986;Ofoegbu, 1984;Fairhead and Okereke, 1988;Benkhelil, 1989;Anudu et al, 2014;Oha et al, 2016). The Adamawa and Biu plateaus as shown ( Figure 1) are the continental part of the alkaline Cameroon volcanic line, as it has a spatial link with Benue Trough (Maluski et al, 1995;Tokam et al, 2010).…”