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Figure F23. Plots of MgO vs. Al2O3, Fe2O3T, and TiO2 for basaltic rock samples, Hole U1383C. Data ranges for aphyric and phyric basalts from corresponding depths in Deep Sea Drilling Project (DSDP) Hole 395A (Bougault et al., 1979; Rhodes et al., 1979) are also shown for comparison. Possible olivine, clinopyroxene, and plagioclase fractionation lines and plagioclase accumulation trends are not based on the chemistry of observed minerals in the Hole U1383C basalts but are simply inferred from published mineral chemistry data of mid-ocean-ridge basalt (e.g., Brewer et al., 1996). Fe2O3T = total iron as Fe2O3.

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