Abstract:The Nixiong Iron Mine, as a large magnetite deposit in the central Gangdese belt, which mainly formed in the early Cretaceous, and this paper will discuss the metallogenic background of magnetite deposit in this period. The Nixiong Early Cretaceous magnetite deposit can be divided into Skarn type and hydrothermal vein type, and mineralization era of the later was limited to about 120 Ma by the U-Pb age (120.1 ± 1.7 Ma) of gabbro dyke in mining area, that was well consistent with the determined mineralization era of Skarn type magnetite deposit, indicating a similar setting of both type magnetite deposit. The Dibucuo Formation, as the main surrounding rock of the Nixiong rock mass, was renamed to be the Zenong Group by detrital zircon U-Pb dating. Combined with the new data of the strata and magmatic rocks, there had been an Early Cretaceous volcanic-intrusive complexe system in the central Gangdese belt, composed of the volcanic rocks from Zenong Group and rock mass emplaced in Zenong Group, both show the geochemical characteristics of an extension tectonic setting. In addition, The relationship between structure and Magma also showed that the mineralization of Early Cretaceous magnetite deposit took place in an extensional stress environment, which were ubiquity in the central Gangdese belt. Finally, a metallogenic geological model of the Nixiong magnetite deposit was established during the Early Cretaceous.