Abstract
Magnetic Susceptibility values are important in interpreting regional magnetic anomalies and in crustal modeling. In this study, Magnetic Susceptibility has been measured on rock samples from the sedimentary succession of Kuje Area in FCT. Variation of susceptibility for the different samples has been analyzed and confirm in the study. According to the measured susceptibility values based on the selected samples, the minimum susceptibility value for sedimentary rocks was found to be 0 which was the minimum value obtained for Dolomite and the maximum susceptibility value for sedimentary rocks was found to be 1480cgs which was the maximum value obtained for shales. For metamorphic rock, the minimum susceptibility value was found to be 25cgs which was the minimum value obtained for schists and its maximum susceptibility value was found to be 3,000cgs which was the maximum value obtained for slate. Finally, the minimum susceptibility value for igneous rocks was found to be 20cgs which was the minimum value obtained for rhyolite and its maximum susceptibility value was 14500cgs which was the maximum value obtained for basalts
Highlights
The Federal Capital Territory is dominated by a high grade metamorphic and sedimentary succession, compaction in the deep sedimentary basin resulting in a decrease in both Acoustic impedance contrast and the signal to noise ratio because of densities, close up to basement rocks are leading to large uncertainties estimating the top-basement in both seismic and gravity (Barrere 2009)
The magnetic susceptibilities of some common rock samples in Gwagwalada area are presented in the table below
The range of value has been shown for limestone, sandstone, shales respectively, and high susceptibility value.Magnetometer was used to examine the susceptibilities of selected samples, the results revealed noticeable variation among the samples
Summary
The Federal Capital Territory is dominated by a high grade metamorphic and sedimentary succession, compaction in the deep sedimentary basin resulting in a decrease in both Acoustic impedance contrast and the signal to noise ratio because of densities, close up to basement rocks are leading to large uncertainties estimating the top-basement in both seismic and gravity (Barrere 2009). The OSRAM project (Origin of Sediment Related Aeromagnetic) documented that part of the off stone Mesozoic and Cenozoic Sedimentary succession are Magnetic (Carmichael, et al 2002) and that finer clastic sediment have higher susceptibility than the coarse grained sand stone (Olesen et al 2010, Agdestin, 1980, Anderson, 1990). This is compatible with the result from magnetic susceptibility study of kuje Area. The rocks of the area can be divided into five major groups, as follows: · Metamorphosed Supracrustal (Exogenetic) Rocks: Mica schist, marble, amphibolites and amphibole schist, finemedium grained gnesis. · Magmatic Complex: Migmatite gneiss, granite gneiss, porphyroblastic granite gneiss, leucocratic granite gneiss, intrusive granite, coarse grained granite. · Minor Intrusions: rhyolites, quartz feldspar porphyry, dacatitea and anddesites, dolerites and basalts. · Other Formations: quartizite, pegmatite, quartz vein
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
