Abstract: The Jianbacun intermediate-acid intrusion was newly discovered in the peripheral area of Jiajika deposits. The authors have conducted the research of LA-ICP-MS zircon U-Pb geochronology and geochemistry to discuss its forming age, tectonic setting and mineralization condition. The results show that the zircon crystalizing age is (211.8±1.0) Ma, and the rock belongs to calc-alkaline-metamluminous rock series, with properties of I-type granitoid, which may originate from partial melting of materials from crust and mantle. The geochemical characteristics indicate that the rock formed in post-collision setting, corresponding to the widespread regional magmatism in Western Sichuan Province during the Late Triassic. The tectonic setting property and magmatism of Jianbacun quartz diorite indicate that this area may be inadequate for the mineralization related to pegmatite mineral deposits.