民和盆地红古城组环境相与作用相分析

民和盆地下白垩统上部的红古城组是一个多次受洪水作用而形成的多层楼式的旋回序列,它以水下沉积构造和水上暴露构造频繁交互的沉积为特征,早期与晚期的洪水规模也存在很大异同,代表了滨湖至岸上洼地的沉积环境。环境相与作用相结合分析,大大深化了红古城组沉积作用及其构造背景分析,反映红古城组是盆地构造演化加速萎缩时期的产物。两者是陆相盆地相分析不可缺少的组成部分。

Analysis of Environment-Facies and Process-Facies of the Honggucheng Formation in the Minghe Basin,Gansu Province,China

The Honggucheng Formation lies in the Upper Lower Cretaceous in the Minghe basin, which is like multistory type and cyclic sequences resulting from multiple flood processing deposition. It is characterized by the interchange of structure underwater and exposure structure. The scales of early and later flooding exist difference,which shows that they were formed in depositional environments of shore lake and depression on banks. Combined with the analysis of environment facies and process facies, the features of deposition and tectonic background of the Honggucheng Formation are studied deeply,which illustrates that Hongguchenng Formation is the result of the basin's accelerated shrinking period during basin evolution. The environment facies and process facies are two important contents of the nonmarine basin analysis.