Sr-isotope and micro-isotope analyses of minerals: examples from some mafic alkaline potassic rocks

Evidence suggests that most silicic and mafic magmas evolve through open- system processes in which magma mixing and crus tal cont aminati on pla y an important role. In- situ Sr­ iso tope analyses help to decode the evolutiona ry hist ory of silicic and mafic magmas tha t have been variously modif ied from their prima ry compositions.