Sr-Nd-Hf-O isotope constraints on crustal contamination and mantle source variation of three Fe-Ti-V oxide ore deposits in the Emeishan large igneous province

•Zircon Hf-O isotopes for three Fe-Ti-V oxide deposits in the Emeishan LIP.•Hongge parental magmas experienced <20% contamination with Precambrian metamorphic rocks.•Carbonate assimilation is detected in the Panzhihua and Taihe deposits.•High-temperature altered oceanic gabbroic crust involved in the plume source of Taihe.