A Study on the Relationship between Large-sized Proterozoic Igneous Provinces and Jinchuan-type Magmatic Cu-Ni Sulfide Deposits in Qilian-Longshou Mountains

The relationship between the mineralization and large-scale Jinchuan magmatic events with respect to the mafic-ultramafic intrusions in the Qilian-Longshou mountain area is not yet clear. This study redefines the geochronological framework of the mafic-ultramafic intrusions and their mineralization by comparison of regional geological formations, detailed description of sections, and petrological and geochemical analysis. The preliminary results showed that the super-sized Jinchuan magmatic Ni-Cu sulfide deposits were the products of large-scale magmatic events in the Neoproterozoic, and may be related to large igneous provinces resulting from the breakup of the Rodinia Supercontinent. There are multi-phased mafic-ultramafic intrusions in the peripheral area. Although the age of the mafic-ultramafic intrusions in the Hualong area in the southern part of the Qilian mountains is different from that of Jinchuan, they were important Cu-Ni mineralization events, which are important to mineral exploration in the region.