Haxiu quartz diorite is outcropped along the western Jinshajiang suture zone, and a study of its genesis and emplacement time can provide isotope geochronological evidence for the plate subduction and collision along the Xijinwulan_Jinshajiang suture zone. According to major element discrimination, it should belong to the IAG type formed during plate subduction. The 40Ar/39Ar dating results of hornblende show that its emplacement time is ～216.4 Ma, suggesting a product of Late Indo-Sinian magmatism. A study of its origin and age shows that, along the Jinshajiang suture zone, the plate collision didn't start and the subduction of the oceanic crust still continued in Late Triassic.