Estimating sedimentary pile thickness, structural lineaments and heat flow in parts of North Central Nigeria from aeromagnetic data

Irumhe, P.E.; Obiadi, I. I.; Obiadi, C.M.; Ezenwaka, C.K.; Mgbolu, C.C.

doi:10.1016/j.sesci.2019.06.001

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Magnetic data can be acquired on ground, in air, and in marine; however, the regional study requires aeromagnetic data. Aeromagnetic data is an essential tool in delineation of Basement rocks and estimation of depth to magnetic sources, even in sedimentary terrain without being disturbed by obstacles [61][62][63][64].…”

Section: Methodsmentioning

confidence: 99%

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Oladejo¹,

Adagunodo

Sunmonu

et al. 2020

Open Geosciences

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A seismic wave is released when there is sudden displacement on a fault plane. The passage of this wave along the fault plane or within the lithosphere could result in ground shaking or vibration at the surface of the Earth. To provide a geophysical explanation to this phenomenon, the high-resolution aeromagnetic data of the sedimentary terrain and part of the Basement Complex of Southwestern Nigeria were processed and interpreted to provide fault architecture of the area, which could serve as conduit for the passage of seismic energy in the study area. High-resolution aeromagnetic data along the Lagos–Ore axis are processed for fault mapping in the study area. The reduced-to-equator (RTE) residual aeromagnetic data used were enhanced using the total horizontal derivative (THD) and upward continuation (UC) filtering techniques on Oasis Montaj 6.4.2 (HJ) software. The resultant maps were overlaid and compared with the plotted RTE residual maps for relevant interpretations. Varying signatures of magnetic anomalies are grouped into high (57.9–89.1 nT), intermediate (38.2–57.9 nT), and low (4.0–38.2 nT) magnetic intensities, which are associated with contracting basement rocks features. The obtained lineaments from the THD reveal areas of various deformations such as brittle, which is associated with faults/fractures, and ductile deformation, which is associated with folds of geological features. The faults, as depict by the UC map, reveal different depth ranges of 500–2250 m at the western side and 1,500–1,250 m at the northwestern area of the study. Since it has been on record that September 11, 2009, earth tremor of magnitude 4.4, with the epicenter at Allada, Bennin Republic, 128 km west of Lagos, Nigeria occurred within the study area, it can be inferred that the established geologic fault architecture could be responsible for the hazard and be part or synthetic to the Ifewara-Zungeru fault in Nigeria.

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Section: Methodsmentioning

confidence: 99%

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Oladejo¹,

Adagunodo

Sunmonu

et al. 2020

Open Geosciences

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“…Reduction or RTP was used to improve aeromagnetic data over north-central Nigeria. The RTP adjustment improved the placement of the anomaly peaks over the source to reveal the sedimentary thickness of less than 1 km [24]. The magnetic anomalies are also converted or reduced to pseudo gravity anomalies.…”

Section: Aeromagnetic Expression Of Intra-sedimentary Faultsmentioning

confidence: 99%

Analysis of aeromagnetic filtering techniques in locating the primary target in sedimentary terrain: A review

2021

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This article analyzes some aeromagnetic filtering techniques for mitigating deceptive geophysical conceptions that may result in a distorted range of geological information from aeromagnetic data. The implication of using the aeromagnetic method, data processing, and enhancement to distinguish sediment-produced anomalies was considered. Two methods to locate buried faults in aeromagnetic data were compared: Edge and fault detection were considered using the magnetic contrast and horizontal gradient methods, whereas rapid depth estimation was considered using the Euler deconvolution method and Signum method. The general challenge to find the magnetic anomaly depth and delineate edges relies on geophysical filtering techniques discussed in order to maintain its geological relevance. The magnetic-contrast layer model signatures help clarify the existence of intra-sedimentary faults. The horizontal gradient approach relative to other derivative methods has better noise stability and fast adaptation to grids without modifying parameters. However, the Signum transform (ST) approach offers a more special solution in depth estimation than the Euler’s deconvolution approach whose solution relies on the required choice of default shape parameters and windows. The Euler deconvolution procedure may not be able to detect structures found by the ST approach and vice versa. As a result, these techniques may be used in conjunction with one another during analysis, as complementary interpretation tools. This review will however aid in the analysis of information used as a criterion for determining faults using various analytical techniques like ST or Euler deconvolution.

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“…Aeromagnetic methods and surveys involve the acquisition of magnetic data usually over a relatively large area using specialized magnetometers mounted on airborne platforms [2][3][4] . Aeromagnetic surveys and data have applications such as in the estimation of sedimentary pile thickness over the basement rocks, mapping of structural features, exploration of mineral resources and the evaluation of geothermal energy potentials in a given locality, amongst others [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Lithological and Structural Characterization of parts of the Lower Benue Trough, Southeast Nigeria, Using Radiometric and Aeromagnetic Data

Okoli,

Obiadi,

Obiadi

et al. 2024

Asian J. Earth Sci

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Estimating sedimentary pile thickness, structural lineaments and heat flow in parts of North Central Nigeria from aeromagnetic data

Cited by 7 publications

References 6 publications

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Analysis of aeromagnetic filtering techniques in locating the primary target in sedimentary terrain: A review

Lithological and Structural Characterization of parts of the Lower Benue Trough, Southeast Nigeria, Using Radiometric and Aeromagnetic Data

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