Investigation of Curie Point Depth, Using Aeromagnetic Data From Eastern Niger Delta, Nigeria
DOI:
https://doi.org/10.64321/jcr.v3i2.05Keywords:
Curie point, Spectral analysis, Niger Delta, AeromagneticAbstract
The research investigated the depth to magnetic sources in parts of Eastern Niger Delta which included Akwa Ibom State, Rivers State and small fringe of Abia state. The portion is enclosed by the coordinates, (Lat. 4.50 N to Lat. 5.00 N) and (Long. 7.50 E to Long. 8.00 E). The Aeromagnetic data was processed with the method of Spectral analysis which generated Curie point depth. Geothermal gradient and heat flow maps of the location. The geothermal gradient observed are of values 7.5 0C/km (lowest) and 21.50C/km (highest) in the Southwest and central section respectively, though it reduces towards the Northeast, Northwest and Southeast. Logically, this trend is repeated for the observed heat flow as the lowest (22 mW/m2) and highest (54 mW/m2) in the Southwest and centre respectively. From the contour maps generated, variations between (7.22km -12.6km) and an average of 10.06km, for the depth to the top, and (28km - 60km) with an average of 43.73km, from surface to the end of magnetic sources in the subsurface, were deduced. It can be observed that the deepest point (60km) to the bottom occurs in the southwestern area and decreases generally towards the northeast. The increase inTotal magnetic intensity (TMI) values between 7473.4nT and 7582.6nT, with high magnetic anomalies located in the northern end, southwest and southeast end and low anomalies in the central are consistent with thicker sedimentary deposits.
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