Partial melting of deeply subducted eclogite from the Sulu orogen in China

摘要: We report partial melting of an ultrahigh pressure eclogite in the Mesozoic Sulu orogen, China. Eclogitic migmatite shows successive stages initial intragranular and grain boundary melt droplets, which grow into a three-dimensional interconnected intergranular network, then segregate accumulate shadow areas merge to form channels dikes that transport magma higher lithosphere. Here we show, using zircon U-Pb dating petrological analyses, occurred at 228-219 Myr ago, shortly after peak metamorphism 230 ago. The melts residues are complimentarily enriched depleted light rare earth element (LREE) compared with original rock. Partial deeply subducted is important process determining rheological structure mechanical behaviour lithosphere its rapid exhumation, controlling flow deep lithospheric material, for generation from upper mantle, potentially contributing arc magmatism growth continental crust.