Tectonic Environment and Age Discrimination of Haljiawu Formation Volcanic rock in Huangtushan-Keziletage Area in Santanghu Basin

Bstract: By exploring the volcanic rock types,formation characteristics and the regional tectonic setting of the Haljiawu formation in Santanghu basin,Huangtushan-keziletage area,prove the Volcanic rocks is normal volcanic rock types.The evolutionary process is thickened lithosphere root delamination resulting in the asthenosphere upwelling in the mantle underplating during collision orogeny,and resulting in volcanic eruptions by partial melting of the arc components,formed a post-collisional volcanic rocks of Late Paleozoic.By fossils,lithological characteristics and isotopic data results to determine,the Haljiawu formation was product of Permian volcanic activity.