Figure F12. A. Variations of Zr/Ba vs. Ba of Site 1154 basaltic glass and whole-rock samples compared with Indian- and Pacific-type MORB fields defined by zero-age Southeast Indian Ridge (SEIR) lavas dredged between 123°E and 133°E. B. Variations of Na₂O/TiO₂ vs. MgO of Site 1154 basaltic glass and whole-rock samples compared with Indian- and Pacific-type MORB fields defined by zero-age SEIR lavas dredged between 123°E and 133°E. PRT = propagating rift tip lavas. Dashed line separates Indian- and Pacific-type zero-age SEIR basalt glass.