Ore-fluid source of multiphase gold mineralization at Tuanshanbei in the central Jiangnan Orogen (NE Hunan, South China): Insight from geology, quartz H-O and monazite in-situ Nd isotope compositions

•Discrete structural styles and mineral assemblages from auriferous quartz-ankerite-pyrite-arsenopyrite veins (Q2 and Q3) suggest superimposing gold mineralization at Tuanshanbei.•Comprehensive geological and H-O-Nd isotopic composition evidences are features that better adhere to metamorphic devolatilization models, indicating that the two-staged gold mineralization events both formed from metamorphic hydrothermal fluids originated from Cangxiyan Group metamorphic rocks.