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Ore-bearing intrusions in the Central Asian Orogenic Belt (CAOB) were examined from nine mines: Boshekul, Nurkazgan, Kounrad, Borly, Aktogai, Koksai, Baogutu, Tuwu and Erdenet. The intrusions are diorite, granodiorite and tonalite with SiO2 contents ranging from 58 to 75 wt per cent, and show mildly fractionated rare earth elements (REE) ([LREE]N/[HREE]N = 2.7-4.7) - light REE and heavy REE - and varying Eu anomalies ([Eu]/[Eu]* = 0.58-1.4). The ratios of Sr/Y vary from 7.9 to 115 and the contents of Y from 4.6 to 23.9 ppm. The parental magmas of the intrusions are intrinsically oxidised. Zircon grains in the ore-bearing rocks from large- and intermediate-sized porphyry Cu deposits show high Ce4+/Ce3+ ratios characterised by 65-422 at Boshekul (>4.1 Mt Cu), 76-480 at Kounrad (>4.8 Mt Cu), 90-280 at Aktogai (>12 Mt Cu), 80-250 at Erdenet (>11 Mt Cu) 74-370 at Nurkazgan (>3.9 Mt Cu), 100-210 at Koksai (>1.6 Mt Cu), and 71-340 at Tuwu (~2.0 Mt Cu). In two small deposits, the ore-bearing rocks display low values of Ce4+/Ce3+; Borly (0.6 Mt Cu) ranging from 28 to 158, and Baogutu (0.6 Mt Cu) from 29 to 113. The Ce4+/Ce3+ ratio of 120 distinguishes large intermediate-size deposits from small-size deposits. This information is potentially useful in exploration for porphyry Cu deposits in the belt.CITATION:Shen, P, Hattori, K, Pan, H, Jackson, S and Seitmuratova, E, 2015. Granitoids associated with porphyry Cu deposits in the Central Asian Orogenic Belt - characteristics and oxygen fugacity, in Proceedings PACRIM 2015 Congress, pp 377-382 (The Australasian Institute of Mining and Metallurgy: Melbourne).