New high-resolution biostratigraphy and facies analyses indicate that a Coniacian-Santonian homoclinal carbonate ramp (Ilam Fm.) developed on the subaerially exposed mid-Turonian surface at the top of Sarvak Fm. in Fars zone of the Zagros Basin (northeastern margin of the Arabian Plate). Spatial facies distribution, sequence stratigraphy, and lateral variation in the thickness of Ilam Fm., as well as extend of erosion of the underlying Sarvak Fm. suggest that a combination of regional tectonic activities and global sea-level changes controlled the development of this succession. A major tectonic configuration in the Zagros belt including several basement faults subdivide the belt into different blocks with distinctive sedimentary records. Reactivation of these preexisting basement faults during Late Cretaceous provided a horst and graben geometry due to the closure of Neo-Tethys. Three of our studied sections are located on an upthrown block, bounded between Kazerun and Karebas basement faults, include inner and mid-ramp deposits. These sections represent an eastward deepening trend which correspond to eastward tilting of this fault block. The easternmost section is located in the eastern neighboring downthrown block , bounded between Karebas and Bastak faults, and includes outer ramp and basin deposits confirming a significant paleo-bathymetrical contrast between the two blocks. Furthermore, eastward thickening of the Ilam Fm. independently confirms the increase of accommodation space, as a result of deeper depositional condition, toward center of the Fars zone. Absence of subaerial exposure features at top of the Sarvak Fm. in the downthrown block shows that the global sea-level fall and regional tectonic regime also controlled the extend of unconformity underlying the Coniacian-Santonian platform deposits (Ilam Fm.).

新的高分辨率生物地层学和相分析表明，在Sarvak Fm顶部的地下暴露的Turonian中层地面上发育了Coniacian-Santonian同质斜碳酸盐岩斜坡（Ilam Fm。）。在Zagros盆地的Fars区（阿拉伯板块的北缘）。Ilam Fm厚度的空间相分布，层序地层和横向变化，以及下伏的Sarvak Fm的侵蚀扩展。这表明区域构造活动和全球海平面变化的组合控制了这一演替的发展。扎格罗斯（Zagros）带的主要构造构造包括几个地下断层，将带细分为具有独特沉积记录的不同块体。由于新特提斯山脉的关闭，在白垩纪晚期对这些先前存在的基底断层的重新活化提供了一种令人生厌的几何形状。我们研究的三个断面位于卡泽伦和卡累巴斯地下断层之间，位于一个上升的地块上，包括内部和中斜坡沉积物。这些部分代表了向东加深的趋势，与该断层块向东倾斜相对应。最东端的区域位于东部相邻的下沉区块，边界在Karebas断层和Bastak断层之间，并且包括外部斜坡和盆地沉积物，这证实了这两个区块之间存在显着的古深度对比。此外，伊兰Fm向东增厚。独立地确认，由于沉积条件较深，朝向法尔斯区域中心的容纳空间增加了。Sarvak Fm顶部没有地下暴露特征。俯冲块中的，表明全球海平面下降和区域构造体制也控制了Coniacian-Santonian平台沉积物（Ilam Fm。）潜在的不整合面的扩展。