DTTG magmas in Qinglong area emplaced between 2517 and 2505 Ma.
The dioritic magma originated from partial melting of a modified depleted mantle.
The TTG magmas from a fractional crystallization of the dioritic magma.
Ancient zircon grains are discovered in the Zunhua Neoarchean felsic paragneisses.
The DTTG gneisses were formed in a Neoarchean arc to back-arc setting.