The Dangba rare metal deposit in the southeast of the Ke’eryin orefield, West Sichuan, is a newly discovered pegmatite- type lithium deposit associated with niobium, tantalum, beryllium, rubidium and tin within the central Songpan- Garze fold belt (SGFB). Based on the geological characteristics of granitic pegmatite in the Dangba deposit, major chemical compositions and laser ablation multicollector inductively coupled plasma mass spectrometry (LA- MC- ICP- MS) dating of cassiterite were undertaken. Electron- microprobe analyser (EMPA) EMPA analyses indicate that the cassiterite from the Dangba deposit are related to the rare metal deposit, and not to the hydrothermal deposit, and therefore represent the age of the rare metal deposit. Cassiterites from the albite spodumene pegmatite (DB2) and lepidolite- bearing albite spodumene pegmatite (DB1) yielded 207Pb/206Pb- 238U/207Pb Tera- Wasserburg lower intercept age of 208. 1±1. 9 Ma (n=31，MSWD=2. 5) and 199. 3±1. 6 Ma (n=11，MSWD=0. 68) respectively, and thus represent the emplacement age of the granitic pegmatite dikes. The results indicate that the Dangba deposit was formed in the late Triassic and is closely related to the magmatic hydrothermal activity in the late stage of Indosinian period. The regional metallogenic ages comparison shows that the Dangba, Lijiagou, the Xuebaoding and the Jiajika deposits are characterized by close mineralization ages, similar mineralization types, and formed in an post- orogenic tectonic setting. The large- scale Li- Be- Nb- Ta- Sn raremetal polymetallic events occurred in the Late Indosinian and Early Yanshanian in SGFB.