Petrotectonics of Sulu-Dabie metamorphic belt,Central and East China

摘要: The Sulu-Dabieshan metamorphic belt separates the North China and Yangtze cratons. This is further divided into three petrological-tectonic units which are respectively equivalent to a root zone of an Andean-type magmatic arc (northern Dabie terrane), continental collision suture (southern terrane) metamorphosed cover sediments margin (Susong complex). They regularly located in space from north south Dabieshan roughly northwest southeast Sulu region spite being strongly reconstructed by Tan-Lu Fault. occurrence Mesozoic granites alkali dike swarm also regular space. occur area, especially northern terrane. These facts support suggestion that there was subduction Plate under or obduction over Plate. Up now, no evident remnant old occean crust has been identified. Ultrahigh pressure (UHPM) rock-bearing southern terrane possibly continent-continent representing between Plates. fact UHPM lenses were tectonically emplaced not-high host gneisses indicates deeply subducted rocks uplifted middle-upper after collision. related occurring on surface at moment suffered least two stages uplifting exhumation.