Synthesis of petrographic, geochemical, and isotopic data for the Boulder batholith, southwest Montana

Initial strontium (Sr i ) values are low and epsilon neodymium (ε Nd ) values are comparable relative to those of other southwest Montana basement and Mesozoic intrusive rocks.Importantly, although the Boulder batholith hosts significant mineral deposits, including the world-class Butte Cu-Ag deposit, ore metal abundances in the Butte Granite, as well as in its peripheral plutons, are not elevated but are comparable to global average abundances in igneous rocks.