Table 1.

Lithogeochemical data for representative Palaeoproterozoic plutono-volcanic rocks of Man-Leo Shield. Data compiled from Zonou (1987), Napon (1988), Leube et al.(1990), Abouchami et al. (1990), Lompo (1991), Ama Salah et al. (1991, 1996), Vidal et al. (1994), Béziat et al. (2000), Diallo (2001), Bumigeb (unpublished data). PTH1-PTH2-PTH3, Palaeoproterozoic tholeiitic lavas; PTHI, Palaeoproterozoic intrusive tholeiites; PCAL, Palaeoproterozoic calc-alkaline lavas; PCAI, Palaeoproterozoic calc-alkaline intrusive rocks; PUI, Palaeoproterozoic ultramafic intrusive rocks. (n), number of samples. West African Craton samples: Burkina Faso (50 PTH1, 25 PTH2, 18 PTH3); Ivory Coast (15 PTH1); Niger (7 PTH2, 7 PTH3); Ghana (33 PTH3); Senegal (8 PTH2). FeO=Fe2OT3 or FeOT.

Samples (n)WEST AFRICAN CARTONBURKINA FASO
PTH1PTH2PTH3PTHIPCALPCAIPUI
65(+/−)40(+/−)58(+/−)21(+/−)11(+/−)13(+/−)7(+/−)
SiO2 (%)49.951.8249.251.6252.071.8249.341.0856.534.2852.923.0741.463.90
TiO2 (%)1.140.360.990.331.080.280.860.380.710.210.800.750.190.12
Al2O3 (%)13.890.9414.080.9614.591.3715.051.6514.170.8813.153.746.483.44
Fe2O3 (%)13.801.8314.652.4011.451.2912.492.168.552.528.422.7810.430.99
MgO (%)5.851.066.761.415.721.426.961.255.472.588.843.6726.427.49
Ni (ppm)151.16147.86335.86234.43161.01136.70159.52120.79211.26221.11170.1180.76790.47369.87
Ce (ppm)11.243.974.681.0926.1112.078.484.9629.938.2423.4920.644.844.66
La 1394.851.801.860.4512.325.813.652.1616.1210.3610.8010.902.342.10
Ce 14011.243.974.681.0926.1112.078.825.0428.1012.0023.5721.724.844.66
Pr 1411.750.620.850.433.541.431.300.733.992.023.082.620.670.61
Nd 1458.872.824.871.1815.796.126.493.4716.577.3813.3710.153.042.87
Sm 1472.710.842.030.673.621.051.830.843.511.693.212.300.720.64
Eu 1510.980.250.780.161.100.280.780.280.950.310.880.360.250.21
Gd 1573.560.972.960.773.750.902.421.023.471.943.552.600.750.53
Tb 1590.640.170.580.150.620.150.410.170.520.250.610.480.130.08
Dy 1614.181.074.051.163.740.872.811.053.211.633.853.130.880.55
Ho 1650.930.220.890.280.780.180.610.220.680.340.850.710.190.10
Er 1662.740.672.700.772.300.561.850.621.930.992.422.060.570.30
Tm 1690.410.110.440.130.330.080.270.090.280.130.340.280.080.04
Yb 1742.640.602.630.842.170.561.800.591.780.732.251.800.550.27
Lu 1750.410.090.420.130.320.080.270.080.280.120.340.280.090.04