Figure 5. Mineral crystallization sequences modeled for the average bulk-rock compositions of the principal units of the Layered Series and equivalent rocks of the Marginal Border Series (Table 2). Calculations of equilibrium crystallization using the COMAGMAT-3.65 program at P =1 kbar, 0.1 wt.% H 2 O in the starting melt, and redox conditions corresponding to the QFM buffer.