| 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