Geochemical Characteristics and Tectonic Significance of Zhahe Rock Mass in Sawu'er Area, Xinjiang

Zhahe rock mass is located in the northern margin of the Kazakhstan-Junggar plate, belonging to the Sawu'er island arc belt of late Paleozoic. And the rock type is mainly granodiorite. Based on a study of rock geochemistry, rock type, magma source area and tectonic setting, the authors found that the Zhahe rock mass was the calc-alkaline intrusive rocks. There was no obvious separation crystallization in the magmatic evolution process and the differentiation degree was not high, suggesting that the original magma may come from the upper mantle and the compression environment in the post-collision stage. Zhahe geochemical characteristics provide new evidence for the study of the vertical crustal accretion and the post-collisional magmatic activities in the late Paleozoic in western junggar.