6.Isotopic chronological study of mineralization show that the fluid inclusion Rb-Sr isochron age for gold-bearing pyrite-quartz veins and pyrite-limonite-quartz veins from the Dashankou gold mine are 354±8.1Ma (2σ ) and 344±21Ma (2σ ), respectively. The two ages are consistent in test errors, indicating the gold deposit was formed in early Carboniferous and related to regional shearing;
成矿作用同位素地质年代学研究表明,大山口金矿区含金黄铁矿—石英脉和含金黄铁矿—
褐铁矿—石英脉的石英流体包裹体Rb—Sr等时线年龄分别为354±8.1Ma(2σ)和344±21Ma(2σ),两者在实验测定误差范围内一致,代表大山口金矿形成的时间发生于早石炭世,成矿作用与区域韧性剪切作用有关;