Tulaergen,Xiangshan,Huangshan.Tianyu,and Baishiquan magmatic Ni-Cu sulfide deposits,which are all located in the eastern part of the Central Asian Orogenic Belt,and associated with small mafic-ultramafic intrusions with high-grade Cu and Ni orebodies have similar ages of formation.Their magma sources are MORB-like and OIB-like depleted mantle.Modeling calculations of Sr-Nd and zircon Hf isotopic data show that about 10-15% of oceanic slab components are added into the source of Baishiquan and Tianyu intrusions,but only less than 5% are in the three other intrusions.The higher degree of subduction metasomatism in the Baishiquan and Tianyu magma sources is likely Lhe resulL of the Paleozoic multiple-stage subduction.Moreover,the relative enrichment of LILE,depletion of HFSE,and lower C