Figure F43. MgO vs. TiO2 for basalts analyzed from Site 1224. Also plotted are compositions of normal mid-ocean-ridge basalt (N-MORB) glasses (small gray dots = basalts, half-filled magenta squares = andesites and rhyodacites) from the East Pacific Rise (compiled from the Lamont-Doherty Basalt Database; Y. Niu, J. Natland, and P. Castillo, unpubl. data). Blue dots = samples from the upper flow of lithologic Unit 1 at Site 1224, red dots = samples from the lower flow, green squares = pillow samples from lithologic Unit 2, dark-blue diamonds = pillow samples from lithologic Unit 3. Samples from the East Pacific Rise span the full range of enrichment in TiO2 during differentiation to ferrobasalts. Samples from Site 1224 are at the low-MgO and high-TiO2 end of the range, indicating that they are quite strongly differentiated.

Figure F43. MgO vs. TiO₂ for basalts analyzed from Site 1224. Also plotted are compositions of normal mid-ocean-ridge basalt (N-MORB) glasses (small gray dots = basalts, half-filled magenta squares = andesites and rhyodacites) from the East Pacific Rise (compiled from the Lamont-Doherty Basalt Database; Y. Niu, J. Natland, and P. Castillo, unpubl. data). Blue dots = samples from the upper flow of lithologic Unit 1 at Site 1224, red dots = samples from the lower flow, green squares = pillow samples from lithologic Unit 2, dark-blue diamonds = pillow samples from lithologic Unit 3. Samples from the East Pacific Rise span the full range of enrichment in TiO₂ during differentiation to ferrobasalts. Samples from Site 1224 are at the low-MgO and high-TiO₂ end of the range, indicating that they are quite strongly differentiated.