The Shengmikeng vein-type lead-zinc deposit is located in Huanggangshan volcano-tectonic depression of the Mesozoic volcanic belt in Northern Wuyi Mountains. The ore featured by veinlets and disseminations is hosted both inside the fault zone in the upper Jurassic Ehuling ignimbrite and the potassic trachyte porphyry. Geochemical characteristics indicate S-type granites and volcanic rocks depleted in sodium and enriched in potassium, with 62.42%～78.02% w(SiO2), 7.66%～9.13% w (K2O+Na2O), 1.18～2.62 w(K2O)/w(Na2O), and Rittmann index δ of 1.67～3.78. From the point of the ΣREE,δEu, geochemical parameters and standard REE distribution patterns, lead-zinc mineralization altered rocks in the Shengmikeng deposit have close genetic relationship with the potassic trachyte porphyry with SHRIMP zircon age of 138.3±1.4 Ma. It is suggested that the deposit was formed in the Early Cretaceous period during Yanshanian and is of sub-volcanic hydrothermal type.
