“…Furthermore, (U-Th)/(He-Pb) double dating can be used to determine both (1) first-cycle volcanic zircon contributions (DZ U-Pb=ZHe age) and (2) depositional lag time. Depositional lag time is defined as the difference between the youngest nonvolcanic ZHe age and depositional age, which is commonly used to elucidate the syn-depositional hinterland thermal and tectonic evolution, including the timing and magnitude of cooling in the uncovering source regions (e.g., Filleaudeau, Mouthereau, & Pik, 2012;Painter, Carrapa, DeCelles, Gehrels, & Thomson, 2014;Rahl et al, 2003;Reiners, Ehlers, & Zeitler, 2005b;Reiners et al, 2005a;Saylor, Stockli, Horton, Nie, & Mora, 2012).…”