Table 1.

Representative major and trace element analyses of CAMP basalts from the Argana Basin

FormationLower formation (Tasguint Formation)Intermediate formation (Alemzi Formation)Average (lower formation) (n=15)Average (intermediate formation) (n=9)
LocalityAguersouaneAlemzi NorthAlemzi SouthAlemzi SouthAlemzi SouthAlemzi NorthTasguintAlemzi NorthAlemzi NorthTasguintTasguintAlemzi South
SampleAN 132B3YAR1.2YAR3.2YAR6.2AN 102AN 130AN 123AN 125AN 128AN 129AN 121
Major elements (wt%)
SiO2 (%)48.7452.505251.851.252.0654.7653.0852.7252.9452.9552.6151.4852.45
TiO20.941.271.361.281.41.311.441.241.191.261.231.091.251.17
Al2O39.8913.2513.3513.4513.6513.8913.8414.2114.214.3814.2713.6313.0614.02
Fe2O3t10.5210.259.9510.5511.0710.82
FeO14.1511.5310.0511.5511.7211.4311.71111.3111.51
MnO0.210.150.120.140.160.170.180.160.160.160.160.140.150.17
MgO16.58.007.57.27.158.356.676.67.467.266.597.819.037.35
CaO7.499.156.627.379.339.519.117.669.949.310.517.659.23
Na2O1.321.953.83.683.652.142.312.513.071.962.482.132.922.35
K2O0.641.152.062.081.981.071.071.41.670.511.170.941.481.25
P2O50.120.170.170.160.170.160.170.150.140.150.150.150.150.14
LOI1.741.712.792.622.951.771.531.192.81.840.991.572.401.64
Trace elements (ppm)
Sc (ppm)323233.532.53641343833.0935.93
V270285277288261272265224267257.62
Cr420300282250178196187334339.90249.62
Co85.234741413944.5936.01404339.49404448.9042.27
Ni110858272676168110130.1885.87
Rb21.98283737.522.514.1716.48283010.99282826.0027.77
Sr159.79225222260354189.06162.34204213248.93213161232.87206.54
Y18.7123.523.522.524.523.2320.53262323.05252622.6124.11
Zr96.70118110110121125.87134.7110992109.28105102111.9199.03
Nb8.6511.511.510.412.411.6911.53997.689910.948.43
Cs1.820.450.506.680.846.68
Ba141.70220276300800193.63189.18250270109.94254210287.40227.99
La10.6116.314.515.41715.6313.93211110.5591914.1615.31
Ce23.7533.53231.537.532.4731.72313523.63253730.1929.45
Pr3.014.073.953.073.673.07
Nd12.60191918.521.516.7416.72161813.03131916.6115.61
Sm3.133.844.073.253.603.25
Eu0.911.351.331.331.421.271.171.041.211.11
Gd3.284.174.253.713.723.71
Tb0.520.650.680.610.630.61
Dy3.274.354.354.24.653.793.943.693.933.94
Ho0.640.800.850.790.770.79
Er1.782.32.42.42.62.192.372.262.202.28
Tm0.240.230.210.240.21
Yb1.632.12.082.062.251.862.022.021.952.08
Lu0.220.270.280.290.260.29
Hf2.393.053.45212.72833.854.21
Ta0.540.700.750.500.670.50
Pb4.811.8615.8812123.1213179.5812.76
Th2.503.524.722.160.423.182.84652.34663.894.92
U0.552.361.511.112.850.640.71320.48421.502.22
  • Major and trace element data were obtained by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES). The samples were powdered in an agate grinder. International standards were used for calibrations tests (ACE, BEN, JB-2, PM-S and WS-E). Rb was measured by flame emission spectroscopy. Relative standard deviations are ±1% for SiO2 and ±2% for other major elements except P2O5 and MnO (±0.01%), and c. 5% for trace elements. The analytical techniques are described in detail by Cotten et al. (1995) (LOI: loss on ignition determined by weight loss after igniting sample at 1000 °C).