The results of the thermodynamic simulations (phase mass as a function
of temperature and composition of bulk liquid and bulk solids) are
included in the supplementary Fig. 3, 4, and 5. In most cases, the
majority of SMB data plot along tie-lines between solid and liquid
equilibrium end members. When considering equilibrium crystallization,
such as in these calculations, tie-lines connect liquid and solid lines
of descent in equilibrium, while the exact points at which they are
connected is a function of the mass crystallized (supplementary Fig. 5).
6. TRACE ELEMENT MODELING RESULTS – MELT AND CRYSTAL LOSS
CALCULATIONS
Results from the trace element modeling suggest that the majority of
samples from the upper portion of the SMB have accumulated significant
amounts of Sr depleted melt. Samples from the lower portions of the
batholith, on the other hand, show evidence of melt loss and crystal
accumulation (Fig. 12). These results were obtained by solving for
MLF in samples where the concentration
of Sr is greater than that the assumed parental magma composition (Table
2) and by solving for MCLF in samples
where the concentration of Sr is depleted compared to the assumed
parental magma composition. The benefit of the trace element model is
that it does not assume a physical process controlling phase separation.