Evolution of Silicic Magma through Assimilation and Subsequent Recharge: Evidence from Sr Isotopes in Sanidine Phenocrysts, Taylor Creek Rhyolite, NM

Isotopic fingerprinting of individual mineral phases, complemented by crystal size data, provides a unique avenue for elucidating the details of evolutionary histories of crustal magma systems. Here we report the first measurements of Sr isotopic compositions of single crystals as a function of size and Sr isotopic profiles constructed through microdrill sampling of sanidine crystals from a high-silica rhyolite lava from the Taylor Creek Rhyolite, NM. Whole-rock