“…Although many~280 Ma granitoids have been reported in the Alxa Block, no A-type granitoids have been identified in previous studies. In general, A-type granites are comparatively enriched in high field strength elements (HFSEs), such as Zr, Nb, Y, REE and Ga (e.g., Collins et al, 1982;Eby, 1992;King et al, 1997King et al, , 2001Sylvester, 1989;Whalen et al, 1987;Yang et al, 2006). In this study, a few granites in the Bayannuoergong batholith have the characteristics of A-type granites.…”