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.

本研究通过整合淡花岗岩脉（leucogranite dykes）的岩石学、年代学与地球化学数据，解析其形成时代与岩石成因，进而为中国阿尔泰造山带的构造-热背景提供新的制约。本研究首次限定了该淡花岗岩脉的形成时代为279~267 Ma，并将其与区域内的高至超高温变质作用建立了时间关联。岩石学与地球化学特征表明，该淡花岗岩主要由泥质变质源岩在流体缺失条件下经白云母脱水熔融形成。该淡花岗岩脉的形成可能归因于早二叠世持续的高热流活动。