Figure F6. TiO2 vs. molecular Cr x 100/(Cr + Al) ratio (Cr#) for spinel in Hole 1271B. Two trends are shown by arrows. Along the first trend ("Reaction 1"), Cr# increases while TiO2 remains very low. In the second trend ("Reaction 2"), both TiO2 and Cr# increase as the amount of gabbroic material increases in order from dunite through troctolite to olivine gabbro and olivine gabbronorite. This second trend is very similar to that for spinel at Hess Deep Site 895 (Arai and Matsukage, 1996). EPR = East Pacific Rise.

Figure F6. TiO₂ vs. molecular Cr x 100/(Cr + Al) ratio (Cr#) for spinel in Hole 1271B. Two trends are shown by arrows. Along the first trend ("Reaction 1"), Cr# increases while TiO₂ remains very low. In the second trend ("Reaction 2"), both TiO₂ and Cr# increase as the amount of gabbroic material increases in order from dunite through troctolite to olivine gabbro and olivine gabbronorite. This second trend is very similar to that for spinel at Hess Deep Site 895 (Arai and Matsukage, 1996). EPR = East Pacific Rise.