Supporting information

1. Figure S1 The mineral phase maps of the studied orthogneisses and metapelites.2. Figure S2 Primitive mantle-normalized trace element patterns and chondrite-normalized REE patterns of the studied orthogneisses.3. Figure S3 Plots of trace elements, and HREE patterns of the detrital zircon core and metamorphic rim from the metapelites.4. Table S1 Bulk-rock major (wt.%) and trace element (ppm) compositions of the orthogneiss and metapelite from the eastern Gangdese arc.5. Table S2 Chemical compositions of garnet from the studied orthogneisses and metapelites (wt.%).6. Table S3 Representative chemical compositions of main minerals from the studied orthogneisses and metapelites (wt.%)7. Table S4 Parameters and calculation results of the petrophysical properties of metapelites and orthogneisses.8. Table S5 Zircon U-Pb dating and trace element compositions of the orthogneisses and metapelites.