摘要
In this paper, LA-ICP-MS zircon U-Pb dating, zircon Hf isotopes and REE patterns were used for researching on the Devonian volcanic rocks in Ashele Cu-Zn district. The concordant age of 1985±8.9 Ma and the weighted age of 2005±30 Ma of a group of older zircons from volcanic rocks by the zircon U-Pb dating represent the forming age of the Precambrian crystalline basement in Altai region. Zircon U-Pb ages, Hf isotopes and Ce negative anomaly implied that Altai Precambrian crystalline basement may be formed in the background of gathering together of Columbia super-continent, and its source material came from the non-uniform mixing of the reducing mantle materials and oxidized crustal materials.