Figure 2. SiO2 , CaO, and TiO2 vs.
FeO/MgO plots for basalts.
1 - America-Antarctic Ridge, 2 - Southwest Indian Ridge, 3 - Bouvet I.,
4 - Bouvet FZ., 5 - Mid-Atlantic Ridge, 6 - rise between the two troughs
into which the south tip of MAR bifurcates (St. G9610), 7 - East Dislocation
Zone, 8 - Shona Smt., 9 - Spiess Ridge, 10 - zone of convergence of the
America-Antarctic, Southwest Indian, and Mid-Atlantic ridges, 11 - linear
rise between Bouvet I. and Spiess Ridge (St. G9622).
Data used are from this study and from
[Dickey, 1977;
Didenko et al., 1999;
Le Roex and Erlank, 1982;
Le Roex et al., 1983, 1987;
Pushcharovsky et al., 1998;
Simonov et al., 1996, 2000\link{35}].