Geology, geochronology and tectonic setting of the Chaihulanzi gold deposit in Inner Mongolia, China

•Late-Permian and Late-Mesozoic Au mineralization was identified in Chaihulanzi.•Mineralization stages are differentiated by sericite-actinolite and quartz-carbonate alteration.•Late-Permian Au mineralization has genetic link with aplite.•The aplite is sourced from NCC basement under post-collision setting.