Figure 6. Plot of Pb isotopic composition of various rocks as in Figure 4. in the global geotectonic environments (Zartman & Doe, 1981). A=mantle, B=orogen, C=upper crust, D=lower crust

From

Lead Reservoirs and Metallization in Nigeria: Example of a Contrasting Geological Terrains

Silas Dada, Onema Adojoh, Adisa Rahaman, Ibrahim Garba

Journal of Geosciences and Geomatics. 2015, 3(2), 28-36 doi:10.12691/jgg-3-2-1