Halaqiaola mafic intrusion lies in the southeast margin of the Altai orogenic belt in Xinjiang, northwestern China. The main rock types are gabbros, gabbro norite, plagioclase-bearing pyroxenite, olivine gabbro and troctolite.Halaqiaola intrusion has low contents of TiO₂ (0.09%~1.28%) and alkali (Na₂O+K₂O=0.37%-0.78%), and belongs to tholeiitic series; the intrusion is rich in large ion lithophile elements and light rare earth elements and depleted in high field elements (such as Nb, Ta). Element geochemistry and Nd-Sr isotopic composition shows that the magma was derived from the dehydration of subducted plate and metasomatismed enriched lithosphere mantle. The primary magma of the intrusion is basaltic magma.