Figure F129. Composition of zone 2 and 3 igneous rocks from Site 1276 diabase sills plotted on the Na2O + K2O vs. SiO2 classification diagram of Le Bas et al. (1986). Note that the compositions were probably affected by hydrothermal alteration. See text for discussion.

Figure F129. Composition of zone 2 and 3 igneous rocks from Site 1276 diabase sills plotted on the Na₂O + K₂O vs. SiO₂ classification diagram of Le Bas et al. (1986). Note that the compositions were probably affected by hydrothermal alteration. See text for discussion.