Deep crustal network of the Equatorial Atlantic Fracture Zones in southern Nigeria

Results in Geophysical Sciences Pub Date : 2021-12-01 DOI:10.1016/j.ringps.2021.100027

O.D. Ajama , M.O. Awoyemi , A.B. Arogundade , O.A. Dasho , S.C. Falade , O.S. Hammed , O.H. Shode

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引用次数: 2

Abstract

This study mapped deep crustal network of the Equatorial Atlantic Fracture Zones in southern Nigeria using regional scale magnetic and gravity data in an attempt to link the Equatorial Atlantic Fracture Zones to structures of similar trend in the continental margin of southern Nigeria. The data were analysed by removing the regional trend of the data and isolating deep-seated anomalies of interest. Thereafter, the theta potential gradient tensor method was applied to delineate the network of the Equatorial Atlantic Fracture Zones and their linkage to other associated deep-seated lineaments in southern Nigeria. Within the limit of the study area, the results obtained revealed the network of the Romanche, Chain and Charcot Fractures Zones, and their extent, several hundreds of kilometers within the landmass of southern Nigeria. The build-up and transformation of the mapped lineaments further supported evidence of extensional crustal deformation within the Niger Delta Basin and Benue Trough axis which may have influenced rifting in the early Cretaceous.

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尼日利亚南部赤道大西洋断裂带的深部地壳网

本研究利用区域尺度的磁重数据绘制了尼日利亚南部赤道大西洋断裂带的深部地壳网，试图将赤道大西洋断裂带与尼日利亚南部大陆边缘类似走向的构造联系起来。通过去除数据的区域趋势和隔离感兴趣的深层异常来分析数据。随后，应用θ电位梯度张量法圈定了尼日利亚南部赤道大西洋断裂带网络及其与其他相关深部构造的联系。在研究区域范围内，获得的结果揭示了Romanche, Chain和Charcot断裂带的网络及其范围，在尼日利亚南部大陆范围内长达数百公里。图中地貌的形成和转变进一步支持了尼日尔三角洲盆地和贝努埃海槽轴内地壳伸展变形的证据，这些变形可能影响了早白垩世的裂陷作用。

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Results in Geophysical Sciences

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