8. CONCLUSIONS
This work adds to the growing catalogue of research describing the cumulate origins of intermediate and silicic plutons and geochemical and textural evidence of phase separation in these systems (Bachl et al. , 2001, Barnes et al. , 2019, Claiborne et al. , 2006, Claiborne et al. , 2010, Cornet et al. , 2022, Fiedrichet al. , 2017, Garibaldi et al. , 2018, Gelman et al. , 2014, Hartung et al. , 2017, Payacán et al. , 2023, Schaen et al. , 2018, Tavazzani et al. , 2020, Walker Jret al. , 2007). The textures and chemistry of the samples suggest that the range in chemical compositions recorded by SMB samples is consistent with phase separation by repacking-accommodated compaction. Trace element modeling suggests that 24% of the mass has crystallized magma of uniform composition before unmixing occurs, explaining the composition of the majority of SMB. We find in the cumulates that the trapped melt fraction is correlated with wt % SiO2 and incompatible trace elements and inversely correlated with depth, fabric intensity, and compatible trace elements. We argue that the batholith is the result of partial-crystallization and subsequent mechanical phase separation by repacking-driven compaction of repeated injections of similar magmas over the course of about two million years as indicated by zircon age dates by previous researchers (Claiborne et al ., 2006, 2010, Walker Jr et al ., 2007).