The Tongde granulites were probably formed at an active continental margin without geochemistry of WPB.The depletion of Rb-Th and Nb-Ta indicates that the primitive magma of the Tongde granulites was contaminated by the lower crust.

• Rb-Th和Nb-Ta亏损的共存,指示了同德麻粒岩的原始岩浆曾受到古老下地壳物质的混染。