Abstract：Daban is located between the North China Craton and the Siberia Craton,belong to the Xing-meng orogenic belt. Volcanic-magmatic action occurs frequently in Paleozoic-Mesozoic. The major rock type is rhyolite and the volcanic has experienced a typical evolution of calc-alkaline series. The major element has the features of S-type granite,indicating that magma source may be sedimentary rocks. The cobweb map of trace elements shows that the magma has experienced a complete differentiation and evolution. The REE distribution model of extrusive rocks indicate that LREE show relative enrichment while HREE loss,REE = 112. 4 × 10-6 ~ 216. 5 × 10-6,LREE/HREE = 2. 65 ~ 4. 24,w( La) /w( Yb)N= 7. 3 ~ 13. 9,w( La) / w( Sm)N= 3. 114 ~ 5. 204,δEu = 0. 24 ~ 0. 74,δEu = 0. 9 ~ 1. 1. The analysis results of trace elements indicate that the tectonic setting are volcanic arc granite and syn-collisional granite. The comprehensive research presents that the magmatic rocks of Daban has the typical characteristic of volcanic arc granite,implying that the magma source is probably arc volcanic rocks,rhyolite results from the adjustment of internal arc.

Keyword：volcanic rocks;geochemistry characteristics;Daban;Inner Mongolia;