Lithostratigraphy, sedimentology, and cyclicity of the Duwi Formation (late Cretaceous) at Abu Tartur plateau, Western Desert of Egypt: evidences for reworking and redeposition

Ayyat, Abdalla M. El

doi:10.1007/s12517-013-1169-x

Cited by 19 publications

(7 citation statements)

References 41 publications

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“…Generally, this type of peloid is not uniform in composition as is their source material. Current activity associated with high energy events favored the formation of this type of peloid (El Ayyat and Kassab, 2004;El Ayyat, 2014). Hard intraclasts are mostly found in shallow water or near the karstic phosphate beds, suggesting they are derived from the phoscrete surfaces.…”

Section: Discussionmentioning

confidence: 97%

“…Winnowing has long been recognized as an important process for the concentration of phosphorites (Cook, 1967). El Ayyat (2004, 2014 believed that winnowing and concentration of phosphorite grains in the Duwi Formation are attributed to episodic high-energy conditions such as storms and/or internal waves. Consequently, the different types of peloids were accumulated together in the same bed.…”

Section: Possible Environmental Factors Controlling Peloid Formationmentioning

confidence: 99%

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Modes of origin and genetic pathways of peloids within the Duwi Formation (late Cretaceous) in Eastern and Western deserts of Egypt: A petrologic perspective

Ayyat

2015

Sedimentary Geology

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Section: Discussionmentioning

confidence: 97%

Section: Possible Environmental Factors Controlling Peloid Formationmentioning

confidence: 99%

Modes of origin and genetic pathways of peloids within the Duwi Formation (late Cretaceous) in Eastern and Western deserts of Egypt: A petrologic perspective

Ayyat

2015

Sedimentary Geology

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“…Mineralogically, the Taref Sandstone contains quartz, feldspars, and rock fragments, with average proportions of 97.9%, 1.2%, and 0.9%, respectively. Based on its composition, the Taref Sandstone can be generally classified as a quartz arenite mineral after [25].…”

Section: Location and Geologymentioning

confidence: 99%

“…These sediments were primarily deposited in shallow epeiric seas, flanking the southern margin of the Tethyan trough. The Duwi Formation comprises a heterogeneous suite of shallow marine rocks, including phosphate, shale, mudstone, marlstone, glauconite, and dolomite [25]. Quaternary and wadi deposits are situated unconformably on some of the older formations and are composed mainly of raised beaches, alluvial fans, wadi deposits, sand, and gravel.…”

Section: Location and Geologymentioning

confidence: 99%

Geophysical Assessment of Structurally Controlled Mineral Resources at Wadi El-Nakheel, Eastern Desert, Egypt

Al Deep,

Ibrahim,

Saleh

2024

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It is of great importance to evaluate simple methods to identify mineral occurrence for the future development of society. Applying a reconnaissance magnetic data analysis can help detect the main structural trends mounted to the occurrence of minerals. In this study, geological and geophysical data were analyzed to evaluate the main structural trends affecting mineralization in the area of Wadi El-Nakheel. Geomagnetic data were processed to remove the earth’s magnetic field and reduce the magnetic pole. Some mathematical filters related to detecting and enhancing boundaries between rock units, depending on their magnetization affinity, were applied, including the first vertical derivative, the analytic signal, and 3D Euler deconvolution. After structural analysis of these data, we reached the following findings: The main structural trends from the surface and subsurface estimations were the northwest–southeast trend and the northeast–southwest trend. The orientation and origin of Wadi El-Nakheel are aligned with the main structural trend affecting the area that formed during the Red Sea Rift movement and the Pan-African orogeny. The depth of the deep-seated structure controlling the valley is 1500 m and all mineral occurrence is mainly structurally controlled in the studied area; phosphate ore outcrops are usually aligned with the northwest–southeast geological trend, and metallic ores are related to basement rock succession and the main dominant geological structures in the studied area. Finally, the magnetic method was demonstrated to be a reliable tool for detecting the subsurface boundary between geologic units.

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“…In North Africa, the Upper Cretaceous formations are dominated by continental shelf deposits; among them black shales rich in organic matter, indicating the development of anoxic conditions (Robinson and Engel 1993). These continental shelf environments have also been characterized by high sedimentation rates (El Ayyat 2015;El-Shafeiy et al 2014Grosheny et al 2008;Hartwig et al 2012;Lüning et al 2004;Meinhold et al 2013;Pletsch et al 2001;Tourtelot 1979).…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of the last cretaceous anoxic event in the Tarfaya Laayoune basin (South of Morocco): Biostratigraphy and Paleoenvironment of the Oum Debaa Formation

Bouwafoud

Benbouziane

Hssaïda

et al. 2021

Acta Musei Silesiae, Scientiae Naturales

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The Tarfaya-Laayoune coastal basin developed in a stable passive margin, where sedimentation occurred in shallow bays. During the Late Cretaceous, bituminous and phosphatic series were deposited in the shallow depression such as Sebkha Oum Debaa. In this work, the age of these Cretaceous layers are refined using a palynological approach and their paleoenvironments are described using organic geochemistry. Based on quantitative and qualitative palynological analyses, the sediments revealed a rich and diverse dinoflagellate cyst assemblage (65 taxa); among them 9 important biostratigraphic markers: Andalusiella inflata, Andalusiella ivoirensis, Andalusiella mauthei, Cerodinium diebelii, Cerodinium speciosum, Dinogymnium acuminatum, Odontochitina porifera, Trichodinium castanea, and Trithyrodinium evittii. According to the reported stratigraphic dinoflagellate taxa distribution, an age range of late Campanian to early Maastrichtian is herein proposed for the Oum Debaa Formation. This biostratigraphy update has been correlated to the Tethyan and Sub-Boreal domains. On the paleoenvironmental level, geochemical proxies have displayed an anoxic lagoon depositional which is dominated by an intermediate climate between hot / humid and arid with an often low paleoproductivity regime which induces redox conditions.

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Lithostratigraphy, sedimentology, and cyclicity of the Duwi Formation (late Cretaceous) at Abu Tartur plateau, Western Desert of Egypt: evidences for reworking and redeposition

Cited by 19 publications

References 41 publications

Modes of origin and genetic pathways of peloids within the Duwi Formation (late Cretaceous) in Eastern and Western deserts of Egypt: A petrologic perspective

Modes of origin and genetic pathways of peloids within the Duwi Formation (late Cretaceous) in Eastern and Western deserts of Egypt: A petrologic perspective

Geophysical Assessment of Structurally Controlled Mineral Resources at Wadi El-Nakheel, Eastern Desert, Egypt

Reconstruction of the last cretaceous anoxic event in the Tarfaya Laayoune basin (South of Morocco): Biostratigraphy and Paleoenvironment of the Oum Debaa Formation

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