摘要
mary name="EnDivSummary">As an important part of the polymetallogenic belt on the middle-lower reaches of the Yangtze River, the Fengshan orefield consists of large-medium-sized Cu-Au polymetallogenic deposits, distributed in Jilongshan, Fengshan, and Lijiawan. Orebodies occur within the contact zones of granodiorite porphyry with Triassic carbonate, and the mineralization was closely related to the Yanshanian granodiorite porphyry. The results are consistent with the molybdenite Re-Os isochron age (140 Ma±) of typical Cu-Au-Mo-(W) deposits in the southeastern deposit-intensive region,indicating that the diagenesis and metallogeny events of the Fengshan orefield happened in Early Cretaceous. The study also obtained the age of Neoproterozic zircon from the Jilongshan granodiorite porphyry, and this provides evidence for existence of the Neo-Archean-palaeo-Proterozoic crystalline basement in the northern margin of the Yangtze massif.