摘要
The ~276 Ma Piqiang layered intrusion,located at the western margin of the Tarim Block,is a part of the Permian Tarim large igneous province.The intrusion mainly consists of gabbro and hosts a giant Fe-Ti-V oxide deposit.The inferred crystallization sequence based on textures and mineral compositions is clinopyroxene+plagioclase → magnetite+ilmenite.Magnetite contains 0.49%-0.97% V2O3,consistent with a relative low oxygen fugacity(