Basement geology derived from gravity anomalies beneath the Benue Trough of Nigeria

New gravity data over the lower part of the Benue Trough revealed two important anomalies that were not recognized from the past gravity data. The anomalies are the central positive gravity of the order of about + 40 mGal around the area of Oturkpo which is interpreted due to the contribution of an...

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Bibliographic Details
Published in:Arabian journal of geosciences 2018-11, Vol.11 (22), p.1-8, Article 694
Main Authors: Abdullahi, Mukaila, Singh, Upendra K.
Format: Article
Language:English
Subjects:
Anomalies
Basement rock
Earth and Environmental Science
Earth science
Earth Sciences
Geology
Gravitation
Gravity
Gravity anomalies
Gravity data
Intrusion
Original Paper
Syenite
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Summary:New gravity data over the lower part of the Benue Trough revealed two important anomalies that were not recognized from the past gravity data. The anomalies are the central positive gravity of the order of about + 40 mGal around the area of Oturkpo which is interpreted due to the contribution of an igneous intrusive (2.76 g/cc) tentatively syenite intrusion. The other, which is the negative gravity anomaly (− 33 mGal), is consistent with the rifted Anambra basin where thicker sediment-fill of 8.4 km is calculated. The interpretation of the gravity anomalies beneath the Peninsula Nigerian Benue Trough revealed that intrusions are hardly separated from the anticlinal folded axes. This could suggest the unstable geological units of the Peninsula Nigerian Benue Trough. In this paper, we have also mapped some volcanic extrusive bodies around the Gboko basement and Oban massif basement, north of Calabar area.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-018-4065-6