Jiaodong and Liaodong peninsulas share similar geological backgrounds for gold mineralization, and there are many similarities between the Jiaodong and Liaodong gold deposits. However, the currently known gold endowment of the Liaodong gold deposit is significantly lower than that of the Jiaodong gold deposit. In this study, we selected the Xiling gold deposit from the Jiaodong and the Xinfang and Xindian gold deposits from the Liaodong as the research objects. Combining the data obtained in this study with previous research results, a comparative study was conducted on the gold mineralization in the Jiaodong and Liaodong gold districts in China.
The ore-forming fluid of the Xiling gold deposit from the Jiaodong is medium temperature, and low salinity CO2-H2O-NaCl hydrothermal fluid system. The mechanism of gold precipitation is interpreted as the fluid immiscibility. The initial sulfur source of the Xiling gold deposit is magmatic origin of sulfur, and the Precambrian basement have provided sufficient sulfur for gold mineralization via intensive water-rock interaction. The ore-forming fluid is a deep-seated magmatic-hydrothermal fluid. As mineralization progressed, abundant ore-forming elements enter the ore-forming fluid from the Precambrian basement via intensive water-rock interaction. The Xindian gold deposit in the Liaodong formed in the Early Cretaceous, between 127.2 and 120.9 Ma. The S-Pb isotopes studies indicate that the ore-forming materials of the Xinfang and Xindian gold deposits in the Liaodong are mainly magmatic origin, and the Gaixian Formation have provided sufficient ore-forming materials for the Xindian gold mineralization. Pyrite trace elements analyses indicate that the initial ore-forming fluids of the Xinfang and Xindian gold deposits are mainly magmatic-hydrothermal fluids. At Xindian, the fluid chemistry was intensively modified by interacting with wall rock (Gaixian Formation) via intensive water-rock interaction. However, the Anshan Group did not play an important role in the Xinfang gold mineralization.
The mineralization age of the Jiaodong gold deposits is mainly clustered at ~120 Ma. The mineralization age of the Liaodong gold deposits mainly includes Triassic, Early Jurassic, and Early Cretaceous. Among them, the Early Cretaceous gold mineralization is extensively distributed in the Liaodong. The ore-forming fluids of the Jiaodong and Liaodong gold deposits were a mixture of crustal-derived and mantle-derived fluids. However, the contribution of mantle-derived fluids to the Jiaodong gold deposit is significantly greater than that of the Liaodong gold deposit. In addition, the Archaean Jiaodong Group and Paleoproterozoic Liaohe Group Gaixian Formation have made great contributions to the gold mineralization in the Jiaodong and Liaodong, respectively.
How to cite: Yu, B.: A comparative study on the gold mineralization in the Jiaodong and Liaodong gold districts in China, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-2232, https://doi.org/10.5194/egusphere-egu25-2232, 2025.
