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冀北沽源-丰宁地区位于华北陆块北缘中段沽源-丰宁中生代火山盆地,是重要的沽源-红山子铀成矿带南段,相继发现了张麻井(460)铀钼矿床、大官厂(534)铀多金属矿床和蔡家营铅锌矿等多个中大型铀多金属矿床。该区地层具有典型的二元结构特征,主要由古元古界基底和中新生代盖层两部分组成。古元古界基底主要包括红旗营子群,中新生代盖层包括上侏罗统张家口组、下白垩统和新近系。上侏罗统张家
The source of the Guyuan-Fengning region in northern Hebei is located in the Guyuan-Fengning Mesozoic volcanic basin in the middle of the northern margin of the North China block. It is an important Guyuan-Hongshanzi uranium metallogenic belt and has been discovered successively by Zhang Majing (460) uranium (534) uranium polymetallic deposits and Caijiaying lead-zinc ore and other large and medium-sized uranium polymetallic deposits. The strata in this area have typical dual structure characteristics, which are mainly composed of two parts: Paleozoic basement and Mesozoic-Cenozoic caprock. The Paleoproterozoic basement mainly includes the Hongqiyingzi Group, and the Meso-Cenozoic cap rocks include the Upper Jurassic Zhangjiakou Formation, Lower Cretaceous and Neogene. Upper Jurassic Zhang