~(40)Ar/~(39)Ar dating of sericite from altered dacite porphyry and quartz porphyry in Yinshan polymetallic deposit of Jiangxi Province and its geological significance
The Yinshan polymetallic deposit in Jiangxi Province is a hydrothermal vein-type deposit closely related to Late Jurassic felsic-intermediate volcanic-subvolcanic activities. The second stage of Cu-Au mineralization is associated with dacite porphyry. Sericites from dacite porphyry and quartz porphyry in the Cu-Au ore zone were analyzed by the ~(40)Ar-~(39)Ar fast-neutron activation dating technique, and the results yielded the plateau age and the isochron age of (178.2±1.4) Ma and (179.6±2.9) Ma respective...