 During prograde and peak metamorphism, temperature and pressure are increased and a large amount of mafic material is added to the crust, whereas after the peak metamorphism, the intrusion of magma stops, resulting in isobaric cooling.Structurally, these Late Neoarchean rocks are dome-shaped, for example, the Jinzhou dome in southern Liaoning and the Huadian dome in southern Jilin.These tonalitic-trondhjemitic-granodioritic gneiss domes are circular or oval and around 10–50 km wide.