Abstract Fluid inclusion microthermometry of synkinematic veins is used to estimate the maximum syntectonic load that was deposited on wedge top in central Appalachians (northeastern United States) during Alleghanian orogeny. The restored loads indicate two major depocenters orogeny: one above Broadtop synclinorium, with as much 7 km Pennsylvanian–Permian probably sourced by erosion rocks uplif...