Integrated Geochemical and Geophysical Approach to Mineral Prospecting – A Case Study on the Basement Complex of Ilesa Area, Nigeria - Advances in Data, Methods, Models and Their Applications in Geoscience - page 90

within the amphibolites, but also exist in the other rock types. There is an improved
delineation of the rock contacts which has hitherto been difficult to map as a result ofdearth
of outcrops and the presence of overburden.
Based on the combined geological, geochemical and geophysical data which are available
(and the modeled results) and interpreted over the delineated area, a new geological map is
proposed for the area. Figure 13 shows the disposition of the prominent linear features,
dykes and the inferred mineralized zone found in the area. The fractures are seen to trend
approximately in the N - S direction. The frequency of fracturing is a function of rock elastic
properties, structure and tectonic history. The rock with high fracture frequency is known to
be highly brittle and prone to fracturing. From this study the occurrence of fractures on the
Amphibolite is high and so also that on the Quartzite/Quartz Schist and Gneiss/Migmatite
Undifferentiated rocks are moderately high. The Quartzites/Quartz Schist isalso strongly
magneticprobably due to the occurrence of iron oxides as described by Ajayi (1988).
7. Acknowledgments
The chapter contribution to the Geoscience Text was done while the author was on
Associateship visit to ICTP, Trieste, Italy. The financial and material support by ICTP that
ensured the successful completion of the work is greatly acknowledged.
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