CHIBOK RIFTO-MAGNETICS AND GEOLOGY

Earth Science Malaysia

article

Nsikak E. Bassey¹  Musa Hayatudeen²  Nyakno J. George³ 

[1] Geology Department, Akwa Ibom State University;Physics Department, Federal University Kashere;Physics Department ,(Geophysics Research Group) Akwa Ibom State University

关键词: Aeromagnetic;    rift;    sedimentary;    low magnetic;    semi-arid zone;   

DOI  :  10.26480/esmy.01.2023.47.54

学科分类：地球科学(综合)

来源: Zibeline International

【 摘 要 】

20 km. This work reinterprets the anomaly using oasis montage™ 7.0 software, by inverse geological modelling of magnetic profiles. The aim of this work is to identify the Chibok magnetic anomaly as a plate tectonic feature, and as part of the West African Rift System. Three profiles were modelled across the residual magnetic anomaly, which yielded a depth range of 1 to 2 km. The result furnished a subsurface picture of ‘horst and graben’ which are characteristic of rifts. The sedimentary infill of the interpreted rift is considered to be sands/or sandstone due to the low magnetic anomaly. Sandstone has very low magnetic susceptibility [30 x106 emu (S.I.)] compared to granite and basalt. Geological data showed NW, NE, N-S, and E-W structural trends on the granitic basement. These manifest as faults, shear zones, joints and foliations. Emplacement of the Tertiary basalt in the NW of the area of study area showed planes of crustal weakness in the Precambrian basement. A palinspatic map of the area identified the pre-Tertiary geology. The sediment infill of the interpreted rift may serve as very rich aquifer for groundwater abstraction for irrigation in this semi-arid zone. The evidence of the plate tectonic nature of the interpreted rift indicated its alignment with offshore transform faults like Chain and Charcot as well as the Cameroun Volcanic Line.

【 授权许可】

CC BY