A magmatic-hydrothermal origin for Ag-Pb-Zn vein formation at the Bianjiadayuan deposit, inner Mongolia, NE China: Evidences from fluid inclusion, stable (C-H-O) and noble gas isotope studies

•Stable and noble gas isotope compositions indicate a magmatic-hydrothermal origin of the ore-forming fluid.•Fluid cooling, phase separation, and mixing with meteoric waters are the important factors for ore deposition.•A porphyry ore system with proximal porphyry type Sn ± Cu ± Mo mineralization and peripheral Ag-Pb-Zn veins.