Extreme mineral-scale Sr isotope heterogeneity in granites by disequilibrium melting of the crust

The broadest ranges of initial Sr isotopic ratios (87Sr/86Sri) ever reported within a single igneous rock (≈2×10−2) are preserved within the late Miocene laccolith-pluton-dyke felsic complex of Elba Island (Italy). For these units, the integration of textural and crystal-scale isotope data allows tracing the evolution of the 87Sr/86Sri of the melt from the emplacement level back to the earliest pre-emplacement crystallization stage. The rock...