Figure 4a. 207Pb/204Pb vs 206Pb/204Pb of various rocks in Nigeria with the 600 Ma reference isochron

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