Discussion on the Genetic Type of Cu-Mo and Pb-Zn-AgDeposits of the Madate Area in Mongolia

A lot of polymetallic deposits, including the Chabu Pb-Zn-Ag deposit, Saerxite Pb-Zn-Ag deposit and Lamacaolutu Cu-Mo deposit, have been found in the Madate area of eastern Mongolia, which belongs to central Mongolia-Erguna polymetallic ore belt. Throughcomprehensive study on the mineralization age,the ore-forming geological backgroud and thesurrounding rock characteristics of each deposit,we classify the mineralization period of the area into two stages:Late Variscan and Yanshanian. Copper-molybdenum deposit is superimposed mineralization of the Late Variscan and Early Yanshanian,Lead-zinc-silver deposit was formed in the Late Yanshanian. The mineralization of the two types of deposits is closely related to the tectonic and magmatic activity. At the same time,by analyzing and comparing the mineralization characteristics and orebody characteristics of each deposit,we classify these deposits into two genetic types:porphyry-type Cu-Mo deposit and epithermal low-temperature hydrothermal veintype lead-zinc-silver deposit. Based on the trace element analytic results of the ore-forming source rock of Saerxite Pb-Zn-Ag deposi and Lamacaolutu Cu-Mo deposit,we think two genetic types as a unified metallogenic series and establish the porphyry-epithermal low-temperature hydrothermal vein-type mineralization model.