Figure 2. Along-axis profiles of isotopic ratios from the Southeast Indian Ridge (SEIR) between 115°E and 138°E. Horizontal scale in kilometers from the eastern bounding transform of the Australian-Anarctic Discordance (AAD). Open symbols and lightly shaded field denote Pacific-type mid-ocean ridge basalts (MORB). Filled symbols and darker field denote Indian-type MORB (from Pyle et al., 1992).