Petrogenesis and geological implications of the Yadong migmatites, South Tibet

Migmatites are widely distributed in the Higher Himalayan Crystalline Sequence at different scales and shapes, forming a natural laboratory for studying the partial melting of the crust. However, the petrogenetic links between migmatites and leucogranites remains controversial, although their tempo-spatial link had been confirmed by many studies. In this study, we conducted field structural investigations, petrography, geochemistry and chronology of the Yadong migmatites. The results show that migmatites were likely derived from partial melting of the Higher Himalayan Crystalline Sequence in situ, and were most derived from the muscovite-and biotite-dehydration melting, accompanying crystallization. This study also confirms that there is a petrogenetic links between migmatites and leucogranites. The study provides new information on the structural evolution model of the orogen.