The gulf of Hammamet (GH) area, located in northeastern offshore Tunisia, experienced several tectonic deformations during the Mesozoic and Cenozoic eras. These deformations generated discontinuities, hiatuses, and thickness variations of sedimentary successions during the late Cretaceous, such as the late Campanian-late Thanetian El Haria Fm, which is documented to be partially or totally eroded in the GH area. Several geological works based on geophysic, seismic, and log data in the GH area attribute the existent (thinner) part of the El Haria Fm to the Palaeocene. The present study analyzes the planktonic foraminiferal biostratigraphy of this thinner part of the El Haria Fm in the well A-1 located in the northeastern part of the GH area. The analyzed foraminiferal assemblages highlight the existence of a Danian sequence (6.1 m) unconformably deposited above a Maastrichtian sequence (12.2 m), which rest unconformably on a late Campanian sequence (12.2 m). The foraminiferal record also indicates the occurrence of three hiatuses across the Campanian-Maastrichtian, early-late Maastrichtian, and Maastrichtian-Danian boundaries, respectively. The correlative data and timelines from the surrounding wells helped to decipher the morphology of the substrate underlying the El Haria Fm (i.e., the Abiod Fm) in the GH area and the distribution pattern of the deposited Campanian-Thanetian sequences. This work depicts subsiding areas towards the northeastern and southwestern parts of the GH area. These subsiding areas are correlative with swells in the southeastern part of the study area, which grade to a NW-trending bald zone without record of the Abiod and El Haria formations.

中文翻译：

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哈马马特海湾地区（东北突尼斯）晚白垩纪运动的浮游有孔虫证据。

位于突尼斯东北部沿海的哈马马特（GH）地区的海湾在中生代和新生代时期经历了几次构造变形。这些变形在白垩纪晚期（例如，Campanian-late Thanetian El Haria Fm晚期）造成了白垩纪晚期沉积演替的不连续性，裂隙和厚度变化，据记录，该区域在GH地区被部分或全部侵蚀。GH地区基于地球物理，地震和测井数据进行的几项地质工作将El Haria Fm的存在（较薄）部分归因于古新世。本研究分析了位于GH地区东北部的A-1井El Haria Fm较薄部分的浮游有孔虫生物地层。分析的有孔虫组合突出显示了达尼安序列的存在（6。1 m）不一致地沉积在Maastrichtian序列（12.2 m）之上，而Maastrichtian序列则不一致地停留在Campanian晚期序列（12.2 m）上。有孔虫记录还表明，在Campanian-Maastrichtian边界，Maastrichtian晚期晚期和Maastrichtian-Danian边界上分别发生了3个裂隙。来自周围井的相关数据和时间线有助于破译GH地区El Haria Fm（即Abiod Fm）下的基底形态和沉积的Campanian-Thanetian序列的分布模式。这项工作描绘了向GH区东北和西南部分的沉降区。这些沉降区域与研究区域东南部的隆起有关，这些隆起属于西北趋势的秃头区域，没有记录阿比奥德和哈里亚的形成。