A neogene age for Traiguen Formation, Aysen, Chile, as revealed by SHRIMP U-Pb dating od detrital zircons

U-Pb SHRIMP ages of detrital zircons as young as 26 Ma indicate that deposition of the volcanosedimentary marine Traiguen Formation occurred during the Neogene. Age peaks at 70, 200, 280, 360, 500 and 1250 to 1400 Ma show that during deposition, the Early Cretaceous components of the North Patagonian Batholith were not shedding detritus into the Traiguen basin. Most of the zircons appear to have been recycled from the Chonos Metamorphic Complex, with the exception of the 70 Ma zircons that probably come from the Peninsula Gallegos - Isla Clemente Granite (au)