COMPOSITIONS OF INITIAL RIFT DIKES AND BASALTS
Dike York Haven Palisades Higganum XCove Minister FoumZquid Messejana Caraquet Shelburne Avalon
                     
SiO2 51.84 51.98 52.62 52.58 52.94 51.99 52.07 52.51 53.58 51.78
TiO2 1.09 1.22 1.17 1.15 1.14 1.10 1.04 0.81 1.06 0.99
Al2O3 14.34 14.48 14.96 14.47 14.13 15.05 15.90 15.56 14.96 14.60
FeO* 9.93 10.19 10.20 10.53 10.05 9.52 9.28 12.11 9.95 9.85
MnO 0.20 0.18 0.17 0.18 0.20 0.18 0.16 0.05 0.17 0.19
MgO 7.72 7.59 7.59 7.81 7.92 7.69 7.16 7.1 6.87 8.46
CaO 10.73 10.33 10.94 10.57 10.94 11.75 11.51 10.51 10.30 11.70
Na2O 1.96 2.04 2.33 1.98 1.97 1.97 2.16 2.16 2.21 1.91
K2O 0.60 0.84 0.56 0.60 0.55 0.60 0.58 0.42 0.75 0.40
P2O5 0.12   0.20 0.13 0.14 0.15 0.14   0.15 0.12
                     
                     
Basalt MtZionChur OrangeMtn Talcott North Mtn   Morocco        
                     
SiO2 51.37 51.45 51.86 52.16   51.06        
TiO2 1.18 1.02 1.07 1.06   1.06        
Al2O3 14.24 14.34 14.27 14.29   14.84        
FeO* 10.86 10.36 10.86 10.35   10.33        
MnO 0.17 0.15 0.16 0.16   0.19        
MgO 7.58 8.19 7.98 7.05   8.17        
CaO 10.78 10.86 11.24 10.35   12.25        
Na2O 2.05 2.10 2.06 2.39   1.69        
K2O 0.21 0.54 0.50 0.60   0.49        
P2O5 0.13 0.13   0.16   0.16        

Sources: Bertrand et al., 1982; Dunn & Stringer, 1990; McHone, unpub.;
Philpotts & Martello, 1986; Puffer, 1992; Smith at al., 1975



Last updated on 7/22/99 by JGM