河南登封地区二叠统石盒子组顶部地层中含有丰富的钙质结核,由于其形态特殊,标志醒目,层位稳定,引起了地质工作者的普遍注意。但对其成因一直认识不一,归纳起来有两种不同的观点:一种认为是机械沉积的原生构造,其形成机制受水动力的控制,可作为判断岩相古地理环境的一种标志;一种认为是成岩过程中化学凝聚作用形成的成岩构造,其形成机 The top strata of the Permian Shihezi Formation in Dengfeng area of ​​Henan Province are rich in calcareous nodules, which have attracted the attention of geologists because of their special morphology, striking signs and stable horizon. However, their causes have not been fully understood. There are two different points of view: one is the original structure of mechanical deposition, whose formation mechanism is controlled by hydrodynamics and can be used as a marker to judge the paleogeographic environment of lithofacies; One is thought to be a diagenetic structure formed by chemical agglomeration during diagenesis, and its formation mechanism