The lower Eocene-lower Miocene succession in the central part of the Al Jabal Al Akhdar, northeast Libya was investigated to determine its depositional environments and shed some light on diagenetic alterations. This succession is composed mainly of carbonate rocks and includes five formations from base to top; the Apollonia, Darnah, Al Bayda, Al Abraq, and Al Faidiyah. Relatively uniform shallow-marine carbonates were accumulated across northeast Libya, including the study area. Facies analysis of the studied carbonate rocks enables determination of four shallow-marine carbonate facies associations. These facies associations are: (1) restricted lagoon with limited circulation at/or below fair-weather wave base, (2) lagoon with open circulation below the fair-weather wave base, (3) platform-margin reefs, and (4) continental slope setting between the fair-weather and storm wave bases. The abundance of shallow marine carbonates indicates the presence of epeiric or epicontinental sea that covered the whole northern Africa. The depositional history in the studied area was controlled primarily by tectonics and relative sea-level changes. Four unconformities (i.e., sequence boundaries) were observed and separating five depositional sequences in the studied succession. Each depositional sequence shows shallowing-upward trend. The recorded unconformities reflect episodes of non-deposition and/or erosion and are associated with major fall in eustatic sea level. The diagenetic processes of the studied carbonate rocks include; micritization, pyritization, compaction, cementation, aggrading neomorphism and partial dissolution.

研究了利比亚东北部 Al Jabal Al Akhdar 中部的始新世 - 中新世下层序列，以确定其沉积环境并揭示成岩作用的一些变化。该层系主要由碳酸盐岩组成，从底部到顶部包括五个地层；Apollonia、Darnah、Al Bayda、Al Abraq 和 Al Faidiyah。在利比亚东北部，包括研究区，积累了相对均匀的浅海碳酸盐岩。对所研究碳酸盐岩的相分析可以确定四种浅海碳酸盐岩相组合。这些相组合是：（1）在晴朗天气波基处/或以下环流有限的受限泻湖，（2）在晴天海浪基部以下具有开放式环流的泻湖，（3）台地边缘珊瑚礁，(4) 晴天和风暴浪基地之间的大陆坡设置。浅海碳酸盐的丰度表明存在覆盖整个北非的表层海或表层海。研究区的沉积历史主要受构造和相对海平面变化的控制。观察到四个不整合面（即层序边界），并在研究的序列中分隔了五个沉积层序。各沉积层序均呈变浅向上的趋势。记录的不整合反映了非沉积和/或侵蚀的事件，并且与海平面的大幅下降有关。所研究的碳酸盐岩的成岩过程包括：微晶化、黄铁矿化、压实、胶结、加成新形态和部分溶解。