 Besides, it remains unknown if the Eastern Block was a mature continent or not during the Large Igneous Province event.The generation of tonalitic-trondhjemitic-granodioritic gneiss is associated with the formation of the magmatic arc during subduction.The geochemistry of tonalitic-trondhjemitic-granodioritic gneiss is similar to that of the calc-alkaline rocks in a continental arc under modern plate tectonics.