杜关地区锰结核产出在华北地台南缘的官道口群龙家园组底部，沿东西向张性断裂分布。锰结核主要由硬锰矿、软锰矿、褐铁矿构成。常量元素含量表明：硬锰矿富钾、贫锰，软锰矿贫钾、富锰。微量元素分析结果显示锰结核形成于大陆边缘裂谷的热水沉积体系。 Manganese nodules in the Du Guan area are distributed at the bottom of the Longjianyuan Formation of Guandaookou Group in the southern margin of the North China Platform and are distributed along the east-west tensor fractures. Manganese nodules are mainly composed of hard manganese, pyrolusite and limonite. The contents of the major elements indicate that the hard manganese ore is rich in potassium, poor in manganese and poor in manganese, and is rich in manganese. Trace element analysis results show that manganese nodules formed in the continental margin rift hot water deposition system.