Abstract The southern Patagonian Andes record Late Cretaceous–Paleogene compressional inversion of the Rocas Verdes backarc basin (RVB) and development fold-thrust belt (FTB). A ductile décollement formed in middle crust accommodated underthrusting, thickening, tectonic burial continental margin (Cordillera Darwin Metamorphic Complex (CDMC)) beneath RVB. We present new geologic mapping, quartz ...