Genesis of the Xiaotongchang basalt-hosted copper deposit in the Jinping area, SW China: Constraints from geochronology, fluid inclusion and geochemistry

•The Xiaotongchang copper deposit mainly formed at 260 Ma and 245 Ma.•The metallogenic stage in Yanshanian is proposed by Re-Os analysis.•The characteristics of two stages of ore-forming fluid are proposed.•A simple metallogenic model of basalt-hosted copper deposit is proposed.