Data for: Crustal melting in a protracted hot setting in the Altai Orogen (NW China): Evidence from Permian leucogranite dykes in the metamorphic belt

In this contribution, we provide integrated petrological, geochronological and geochemical results of the leucogranite dykes to decipher their ages and petrogenesis and thus provide new constraints on the tectono-thermal setting of the Chinese Altai orogeny. Our work, for the first time, dates the ages of the leucogranite dykes (279–267 Ma) and places these leucogranite dykes in temporal association with the high to hihg-/ ultrahigh-temperature metamorphism in the region. The petrologic and geochemical features indicate that the leucogranites were derived from fluid-absent muscovite dehydration melting mainly of metapelitic source. The generation of the leucogranite dykes may have been attributed to long-lasting high heat flow in early Permian.