Magma mixing affected the Late Triassic porphyry mineralization in the Yidun arc in SW China

•The crystallization age of Pulang MME is 216.2 ± 2.0 Ma consistent with the host rock QMP and the Daocheng GD and MME.•Whether host rock or MME, The fo2 of Daocheng lower than that of Pulang.•The degree of magma mixing gradually decreases from south to north in Yidun.