Table 3.

Sr and Nd isotopes of Palaeoproterozoic Zenaga plutons

PlutonSampleRbSr87Rb/86Sr87Sr/86SrSri 600 MaSri 2035 MaSmNd147Sm/144Nd143Nd/144NdεNd 600 MaεNd 2035 MaMagmatic εNd (see text) 147Sm/144Nd used2035 MaTDM (Ma)
AzguemerziTZG21101721.8580.7492230.0000120.7333230.6947418.4447.000.10850.5114720.000009−16.010.30measured0.382284
AzguemerziASZ16921851.4440.7418280.0000090.7294730.6994946.5642.220.09390.5113560.000006−17.151.86measured1.932151
AzguemerziTim40951401.9750.7664820.0000140.7495830.7085776.1433.140.11210.5115460.000007−14.840.81measured0.892253
AssersaAsra91651632.2911.5397250.0000151.2634300.5929972.196.310.21040.5128620.0000083.320.79measured0.94
AssersaAsra111401724.8761.1520290.0000150.9391830.4227122.316.900.20260.5126990.0000070.74−0.36measured−0.22
AssersaAs1121782126.4431.4992090.0000151.2729510.7239351.624.700.20840.5125390.000008−2.84−5.030.18 (estimated)0.38
Aït DaouiAD 241621164.0740.7902330.0000080.7553720.6707822.539.730.15730.5117470.000008−14.38−7.120.1058=AD282.522120
Aït DaouiAD 261501562.7980.7647440.0000090.7408020.6827063.426.640.31170.5123440.000007−14.58−35.990.1058=AD282.322135
Aït DaouiAD 28901381.8950.7497360.0000070.7335210.6941756.8939.400.10580.5115100.000011−15.051.770.1058 (measured)1.842170
TamarouftAn391431702.4490.7688740.0000080.7479200.6970760.281.970.08430.5119670.000032−4.4716.370.1911=TGR48−3.32
TamarouftTGR431931442.8041.4475830.0000171.0813340.1926290.901.920.28330.5129590.000009−0.38−16.450.1911=TGR480.79
TamarouftTGR481552915.9741.0399920.0000120.9033140.5716650.571.790.19110.5125240.000011−1.80−0.770.1911 (measured)−0.63
TazenakhtTZK31591353.4370.7923430.0000110.7629370.6915843.9717.700.13570.5119780.000014−8.213.070.1357 (measured)3.172086
TazenakhtTA41353411.5760.7837250.0000110.6846740.4443267.1335.240.12230.5119720.000007−7.306.490.1357=TZK34.091992
TazenakhtTA868633.1550.8092720.0000080.7822790.7167790.813.240.15200.5119630.000010−9.76−1.500.1357=TZK31.622245
  • TDM model ages calculated following Nelson & DePaolo (1985). For altered samples, the magmatic ϵNd and the TDM model ages have been calculated, using the 147Sm/144Nd ratio from 600 to 2035 Ma, of an unaltered sample, from the same pluton (column ‘147Sm/144Nd used’).