Abstract: The Yihe-Suhe fault belt is a Mesozoic rift structure, consisting of many secondary faults. The left lateral strike-slip motion along these faults between the Jurassic and the Cretaceous periods appears to be the initial stage of development of the rift. Then a florishing stage of faulting depression and extension was in Cretaceous time. Since the Tertiary period it had become a compressonal tectonic belt characterized by the intensive folding and thrusting, and the rift is disappeared.

摘要： 本文从沂沭断裂带的大地构造背景、边界断裂、地貌、沉积岩相、火山和地震活动、地壳深部结构、重力、地热等的分析,说明沂沭断裂是一条中生代的裂谷,并给出了裂谷的形成机制及其演化特征。