Oligocene deposits of the Qom Formation in central Iran were studied to reconstruct the sedimentary environment and depositional sequences based on microfacies (MF) and micro-taphofacies (MTF) analysis. A total of 310 thin sections (210 and 100 from Vidoje and Neizar respectively) were studied to differentiate eight microfacies (MF) and five microtaphofacies (MTF) types. These MFs are representative of a variety of depositional environments including restricted and semi-restricted lagoons as well as open marine settings. Overall, the distribution of MFs at the two sites suggests an open-shelf setting for the Qom Formation. Three complete third-order depositional sequences together with one incomplete sequence were identified. In the Rupelian stage, sea level changes in the Neizar and Vidoje areas were most likely affected by tectonics controlled by regional faults, whereas regional sea-level fluctuations of the south Tethyan Seaway and the Paratethys Basin controlled sea-level changes in the Chattian stage.

中文翻译：

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基于微相和微渗相分析的伊朗中部渐新世库姆组沉积环境和沉积序列

研究了伊朗中部库姆组渐新世沉积物，以基于微相 (MF) 和微火山相 (MTF) 分析重建沉积环境和沉积序列。研究了总共 310 个薄片（分别来自 Vidoje 和 Neizar 的 210 个和 100 个）以区分八种微相 (MF) 和五种微热相 (MTF) 类型。这些 MF 代表了各种沉积环境，包括限制和半限制泻湖以及开放的海洋环境。总体而言，这两个站点的 MF 分布表明库姆地层处于开放式架设环境。确定了三个完整的三级沉积层序和一个不完整的层序。在Rupelian阶段，