Petrogenesis and Implications of Calc-Alkaline Cryptic Hybrid Magmas from Washburn Volcano, Absaroka Volcanic Province, USA

2002 Journal of Petrology  
a major eruptive center in the low-K western belt of the AVP. New 40 Ar/ 39 Ar age determinations indicate that magmatism at the volcano commenced as early as 55 Ma and continued until at least 52 Ma. Although mineral and whole-rock compositional data reflect near equilibrium crystallization of modal phenocrysts, petrogenetic mod-Extended dataset can be found at http://www.petrology.
doi:10.1093/petrology/43.4.663 fatcat:gdb3jp2pyzhd5ffgnjlh7gnppa