摘要
Fertile components in UHP rocks could undergo partial melting at both water-present or-absent conditions during deep subduction as well as early stages of rapid exhumation of continental materials. To further constrain the timing of the partial melting events, the authors have carried out SHRIMP zircon U/Pb dating on UHP metapelite as well as concordant K-rich granitic dike from Yangkou, Shandong Province. The result indicates that the Su-Lu UHP metasediments underwent partial melting at ~221 Ma and prior to the widespread amphibolite facies retrograde metamorphism.