Figure F23. A. Variations of Zr/Ba vs. Ba for Holes 1156A and 1156B glass and whole rocks compared with Indian- and Pacific-type mid-ocean-ridge basalt (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 for Holes 1156A and 1156B glass and whole rocks compared with Indian- and Pacific-type MORB fields defined by zero-age SEIR lavas dredged between 123°E and 133°E. Dashed line separates Indian- and Pacific-type zero-age SEIR basalt glass.