Abstract:

This study focuses on the tectonic origin of the Early Permian alkali granites in the area of Wudaogou, Heihe based on its petrological, geochemical and isotopic characteristics. These granites are aluminous to peraluminous in composition and high in Si and alkali, but low in Ca and Mg. They are enriched in Rb, Th and K, but depleted in Ba, Sr, P, Ti and Nb. Their REE distributions are of typical gull-type pattern. Overall, they have features of typical A-type granite and were considered to be formed in an extensional environment after collision of Ergun-Xing’an block with Songnen-Zhangguangcai block. The newly identified Wudaogou A-type granites in the area of Heihe are of great significance to the ongoing study on the Late Paleozoic tectonic evolution and regional metallogenesis.

Key words: Early Permian, A-type granite, tectonic origin, Wudaogou of Heihe