埃及苏伊士湾 Esh-ElMellaha 半地堑上白垩世-下古近纪地层的新见解

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of African Earth Sciences Pub Date : 2024-08-10 DOI:10.1016/j.jafrearsci.2024.105381
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引用次数: 0

摘要

对埃及苏伊士湾 Esh-ElMellaha 半格拉本的上白垩世-下古生代地层进行了详细的实地和地层学(岩石地层学 & 生物地层学)研究。对四个地层剖面进行了调查,并按地质剖面由南向北排列如下:Gabal El-Mellaha、Wadi Abu Had、Wadi Dib 和 Gabal Tarbul。通过实地考察,确定了四个岩石地层单元(构造):Sudr(上部)、Dib、Esna 和 Thebes(顶部)。独特的 Dababiya Quarry Member(DQM)是古新世始新世热量最高期(PETM)的特征,最初记录于 Esh-ElMellaha 地区。Sudr Formation 在地层上分为两个独特的非正式岩石单元,即砾质层状石灰岩单元和钙质页岩单元。本文回顾了迪卜地层,它与埃及不同地理区域的达赫拉地层(上部)相互关联。该地层由釉质碳酸盐岩(生物碎屑灰岩)组成,包含再加工的砾石和鹅卵石碎屑以及破碎的大型化石(如头足类、腹足类和双壳类动物、珊瑚)。Dib Formation(迪布地层)被归入下古新世(Danian Stage),这是根据出现的Praemuricids类群(如Praemurica inconstans和P. uncinata)索引化石确定的。埃斯纳地层和底比斯地层被归入伊普雷希安期。迪布地层以两个区域性不整合面(侵蚀面)为界,这是与叙利亚构造事件相关的两个构造事件(I 和 II)的结果。
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New insights on the stratigraphy of the Upper Cretaceous-lower Paleogene successions at Esh-ElMellaha half-graben, Gulf of Suez, Egypt

Detailed field and stratigraphic (lithostratigraphy & biostratigraphy) studies were carried out on the Upper Cretaceous–lower Paleogene successions at Esh-ElMellaha half-graben, Gulf of Suez, Egypt. Four stratigraphic sections were investigated and arranged in a geologic profile extends from south to north as follow: Gabal El-Mellaha, Wadi Abu Had, Wadi Dib and Gabal Tarbul. The field work led to recognize four lithostratigraphic units (formations): Sudr (upper part), Dib, Esna and Thebes (top). The distinctive Dababiya Quarry Member (DQM) which characterizes the Paleocene Eocene Thermal Maximum (PETM) was initially recorded at Esh-ElMellaha region. Sudr Formation is stratigraphically differentiated into two distinctive informal rock units, argillaceous bedded limestone unit and calcareous shale unit. The Dib Formation is here reviewed and correlates with the Dakhla Formation (upper part) in the different geographic neighborhoods of Egypt. It consists of glauconitic carbonate rocks (bioclastic limestone) embracing reworked gravelly and pebbly extra-clasts and broken exhumed mega-fossils (e.g. cephalopods, gastropods and bivalves, corals). Dib Formation is assigned to thelower Paleocene (Danian Stage) according to the occurrence of praemuricids taxa (e.g. Praemurica inconstans and P. uncinata) index fossils. Esna and Thebes formations are assigned to the Ypresian Stage. Dib Formation is bounded by two regional unconformity surfaces (erosional surfaces) as a result of two tectonic events (I and II) linked to Syrian Tectonic Event.

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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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