The formation of modified zircons in F-rich highly-evolved granites: An example from the Shuangji granites in Eastern Tianshan, China

Two populations of zircons are present in the F-rich highly evolved 300 Ma Shuangji granites, Xinjiang, eastern Tianshan, China. Zircon I comprise a very small proportion of the population. They show characteristics of primary igneous zircons and yield an age of ca. 300 Ma. Zircon II are the dominant type and are weakly luminescent under cathodoluminescence (CL) but show a range of complex textures in back-scattered electron (BSE) images. Zircon...