Figure F6. (A) Total alkalis (TAS) vs. silica and (B) potassium vs. silica covariation diagrams for Leg 201 glass analysis. The TAS plot displays the Irvine and Baranger (1971) alkaline/subalkaline (tholeiitic) division line (dashed line). TAS diagram values and nomenclature are from Le Maitre et al. (1989) in Rollinson (1993). B is the subdivision of the subalkaline field (divisions are from the compilation of Rickwood [1989] in Rollinson [1993]). Nomenclature in parentheses is that of Rickwood (1989) and the nomenclature not in parentheses is that of Le Maitre et al. (1989).

Figure F6. (A) Total alkalis (TAS) vs. silica and (B) potassium vs. silica covariation diagrams for Leg 201 glass analysis. The TAS plot displays the Irvine and Baranger (1971) alkaline/subalkaline (tholeiitic) division line (dashed line). TAS diagram values and nomenclature are from Le Maitre et al. (1989) in Rollinson (1993). B is the subdivision of the subalkaline field (divisions are from the compilation of Rickwood [1989] in Rollinson [1993]). Nomenclature in parentheses is that of Rickwood (1989) and the nomenclature not in parentheses is that of Le Maitre et al. (1989).