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.

1. 图S1 本次研究的正片麻岩与变泥质岩的矿物相分布图。2. 图S2 本次研究的正片麻岩的原始地幔标准化微量元素配分图与球粒陨石标准化稀土元素（Rare Earth Element，REE）配分图。3. 图S3 本次研究的变泥质岩中碎屑锆石核部与变质边的微量元素图解及重稀土元素配分图。4. 表S1 冈底斯弧东部正片麻岩与变泥质岩的全岩主量元素（wt.%）及微量元素（ppm）组成。5. 表S2 本次研究的正片麻岩与变泥质岩中石榴子石的化学成分（wt.%）。6. 表S3 本次研究的正片麻岩与变泥质岩中主要矿物的典型化学成分（wt.%）。7. 表S4 本次研究的变泥质岩与正片麻岩的岩石物理性质参数及计算结果。8. 表S5 本次研究的正片麻岩与变泥质岩的锆石U-Pb定年数据及微量元素组成。