Analytical methods and results for submitted manuscript

Analytical methods are presented in Test S1, including electron microprobe analysis (EMPA) and electron backscatter diffraction (EBSD). EMPA and EBSD were carried out at Key Laboratory of Continental Tectonics and Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China. The mineral compositions are listed in Table S1.