东昆仑屈库勒克东金锑矿床地质特征、控矿构造及成因OA北大核心CSTPCD

The Qukulekedong deposit in Xinjiang,NW China is a large Au-Sb deposit that was newly discovered in the westernmost part of the East Kunlun Orogen. Large-scale Au-Sb mineralization and associated hydrothermal al-teration are confined within the F5 fault and associated fracture zone. The Au-Sb lodes are predominantly hosted within the slightly-metamorphic carbonaceous siltstone of the Upper Carboniferous Halamilanhe Group with mi-nor hosted in the dioritic dykes. Ore minerals mainly include pyrite and stibnite,as well as minor arsenopyrite,chalcopyrite,pyrrhotite,and native gold. They commonly occur as disseminated,veined,veinlet,and massive ores. The mineralization has a close relationship with silicification and sericitization. Geometric and kinematic analysis indicate that the F5 fault strikes east-west and dips to the north (340°～20°) at 55°～85°,showing a top-to-the-south thrusting formed in a syn-to post-collisional orogenic setting during the Triassic. Field geological evi-dence,in combination with previous studies,suggest that the F5 fault predominantly controls the geometry,spatial distribution and occurrence of Au-Sb mineralized corridor and high-grade lodes,and the timing of faulting coin-cides with that of Au-Sb mineralization. Therefore,the F5 fault becomes a pivotal controlling factor for Au-Sb mineralization. The dioritic dykes plays a role of catalyst in the Au-Sb enrichment and mineralization,rather than a direct causative factor. Based on geological characteristics,ore-controlling structures and its control on ore ge-nesis,and previous studies,we propose that the Qukulekedong Au-Sb deposit is likely a fault-controlled orogenic deposit.