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 76

Fig. 2. A plot of the variability of the Principal Component, with five components
accounting for 97. 44%.

accounting for 41. 11%. In U 2 the elements,Pb and Cr (i. e. Pb - Cr) accounting for 27.
65%and U 3 the elementsCd and Zn in association (i. e. Cd-Zn) with 16. 58 %.

Element Threshold

(ppm)

Range
(ppm)

Geometric Mean
(ppm)

Std. dev.

Pb 4. 50 3. 00 - 8. 00 1. 10 0. 0512

Fe 400. 00 50. 00 - 1750. 00 346. 00 5. 0903

Ni 5. 00 1. 50 - 7. 00 4. 00 0. 2121

Cd 0. 80 0. 03 - 1. 70 0. 50 0. 3043

Cr 0. 40 0. 01 - 1. 00 0. 30 0. 3512

Cu 0. 04 0. 01 - 0. 90 0. 03 0. 0090

Zn 0. 20 0. 01 - 0. 40 0. 14 0. 0113

Mn 10. 00 0. 20 - 26. 0 7. 30 1. 2015

Table 1. Descriptive statistics of the elements

Element Pb Fe Ni Cd Cr Cu Zn Mn

Pb 6. 41 438. 90 -0. 02 0. 08 -0. 05 0. 01 0. 08 4. 73

Fe 438. 90 281721. 80 339. 80 50. 00 3. 26 0. 14 2. 32 3602. 40

Ni -0. 02 339. 8 1. 81 0. 21 0. 06 0. 01 0. 02 4. 26

Cd 0. 08 50. 00 0. 21 0. 18 0. 02 -0. 01 0. 02 0. 81

Cr -0. 05 3. 26 0. 06 0. 02 0. 05 0. 01 0. 01 0. 15

Cu 0. 01 0. 14 0. 01 -0. 01 0. 01 0. 01 0. 01 0. 02

Zn 0. 08 2. 32 0. 02 0. 02 0. 01 0. 01 0. 01 0. 03

Mn 4. 73 3602. 4 4. 26 0. 81 0. 02 0. 02 0. 03 52. 41

Table 2. Covariance Matrix of the elements