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Figure F25. Plot of Zr/Y vs. Zr/TiO2 for basaltic rock samples, Hole U1383C. Data ranges for shallower and deeper units in Hole U1382A are also shown for comparison. Note that the porphyritic unit in Hole U1382A belongs to a deeper unit, which has higher Zr/Y and Zr/TiO2 values than shallower units, whereas that in U1383C belongs to a shallower unit, which has higher values than deeper units. This difference implies that the two petrographically similar basalts from Holes U1382A and U1383C were derived from different magma sources.

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