Figure F13. Ti/Zr abundance ratio vs. depth for Hole 1203A lavas. The alkalic basalt of Units 23 and 26 near the bottom of the hole have relatively low Ti/Zr ratios. This result contrasts with the classic Hawaiian trend of increasing alkalinity with decreasing eruption age during the transition from shield- to postshield-stage volcanism.

Figure F13. Ti/Zr abundance ratio vs. depth for Hole 1203A lavas. The alkalic basalt of Units 23 and 26 near the bottom of the hole have relatively low Ti/Zr ratios. This result contrasts with the classic Hawaiian trend of increasing alkalinity with decreasing eruption age during the transition from shield- to postshield-stage volcanism.