SHRIMP U-Pb zircon dating and geochemistry of the 3.8–3.1 Ga Hujiamiao Complex in Anshan (North China Craton) and the significance of the trondhjemites for early crustal genesis

•A new complex, named as the Hujiamiao Complex, was discovered in the Anshan area, NCC.•Trondhjemitic rocks of different ages from 3.79 to 3.11 Ga have been identified.•It is the first time in Anshan to identify trondhjemitic rocks with relatively high (La/Yb)n ratios.•Magmatic zircons have εHf(t) of −12.3 to 1.6, tDM(Hf) and tCC(Hf) ages of 4.1 to 3.6 Ga and 4.3 to 3.7 Ga.•All the Anshan 3.8–3.3 Ga complexes are the relics of the same larger complex in the area.