Geochemical evidence for reworking of the juvenile crust in the Neoarchean for felsic magmatism in the Yunzhongshan area, the North China Craton

The North China Craton experienced two phases of tectonothermal events at ca. 2.8–2.7 Ga and ca. 2.6–2.5 Ga, respectively. Although 2.6–2.5 Ga granitic gneisses and metavolcano-sedimentary sequences are widespread in the craton, the major stage of crustal growth has been determined to occur at 2.8–2.7 Ga in terms of whole-rock Sm-Nd and zircon Lu-Hf isotope studies. It has been intriguing how the vast 2.8–2.7 Ga juvenile mafic crust would have...