 Besides, other than Anshan and eastern Hebei area, a Mesoarchean crust is confirmed to be existed in Qixia area.Other than the sparse distribution of pre-Neoarchean rocks in the northeastern Eastern Block, the Neoarchean rocks predominantly cover 90% of the exposed Block's basement.They are made up of tonalitic-trondhjemitic-granodioritic gneiss with a minority of metamorphosed sedimentary rocks.