Late Moscovian phylloid algal-microbial mounds from Wadi Araba, north Eastern Desert, Egypt: a new construction model and paleogeographic distribution

Abd-Elhameed, Shahin; Mahmoud, Abdelaziz; Salama, Yasser

doi:10.1007/s00531-021-02097-7

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…During the Late Cretaceous, Egypt was situated at the southern edge of the Neo-Tethys [16,32,33], and an extended carbonate platform covered North Africa due to the sea-level rise [2,34]. Hemipelagic sediments of deep carbonate platform, consisting of carbonate and marley facies, were developed in northern Egypt during the Campanian-Maastrichtian time [3].…”

Section: Geologic Settingmentioning

confidence: 99%

Macrofaunal communities and microfacies analysis of the upper Campanian-Maastrichtian Sudr Formation at the Galala Plateaus, north Eastern Desert, Egypt: paleoenvironmental and paleobiogeographical implications

Abd-Elhameed,

Salama,

Mahmoud

2024

Advances in Basic and Applied Sciences

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The Upper Cretaceous deposits are widely distributed and well exposed in northern Egypt. Important upper Campanian-Maastrichtian carbonate deposits outcrop at the Northern and Southern Galala Plateaus, north Eastern Desert, represented by Sudr Formation. Sudr Formation is lithologically investigated, sampled, and the included fauna are collected for taxonomic and paleobiogeographic studies. Four gastropod species, belonging to three genera and three families, as well as twelve bivalve species, representative of twelve genera and nine families, are identified. Two gastropod species; Cerithium buddha Noetling, Potamides temalacaensis Perrilliat et al., and four bivalve species; Gryphaeostrea canaliculata (Sowerby), Venilicardia truncata (Sowerby), Calva (Egelicalva) buttensis (Anderson), Lyriochlamys dentata (Nilsson), are recorded for the first time from the Upper Cretaceous deposits of Egypt. The microfacies analysis of the carbonates of Sudr Formation revealed four distinct microfacies types, each with characteristic bioclasts and textural features. These microfacies types suggest open-marine, high-energy shallow subtidal shoal to low-energy deep subtidal environments. The paleobiogeography of the recorded bivalve taxa is highlighted, revealing two endemic species to Egypt; Nucula chargensis Quaas and Meretrix rohlfsi (Quaas). On the other hand, the other identified bivalve species show wide distribution over a broad geographical

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Section: Geologic Settingmentioning

confidence: 99%

Macrofaunal communities and microfacies analysis of the upper Campanian-Maastrichtian Sudr Formation at the Galala Plateaus, north Eastern Desert, Egypt: paleoenvironmental and paleobiogeographical implications

Abd-Elhameed,

Salama,

Mahmoud

2024

Advances in Basic and Applied Sciences

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Integrating facies, mineralogy, and paleomagnetism to constrain the age and provenance of Paleozoic siliciclastic sedimentary rocks along the northern Gondwana margin: insights from the Araba and Naqus formations in western Gulf of Suez, Egypt

Al-Nashar,

Hafez,

El-Moghny

et al. 2024

Int J Earth Sci (Geol Rundsch)

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The depositional ages and provenance of the Paleozoic Araba and Naqus Formations along the northern Gondwanan margin in Egypt have remained uncertain due to a lack of index fossils. Resolving this issue is crucial for understanding regional geology during deposition and subsequent tectonic development. We integrate detailed facies analysis, anisotropy of magnetic susceptibility (AMS), paleomagnetism, and mineralogical data to elucidate the genesis and depositional ages of the Araba and Naqus Formations. Petrographic analyses identified seven distinct facies types, providing insights into sedimentary textures, maturity, and sources, with contributions from igneous and metamorphic sources indicated by heavy minerals. X-ray diffraction (XRD) analysis identified accessory minerals such as quartz, goethite, kaolinite, hematite, and anatase. Paleomagnetism isolated two magnetic components (CA and CN) providing the first robust paleo pole positions at Lat. = 70.8° N, Long. = 308.2° E and Lat. = 37.8° N, Long. = 233.1° E, indicating Cambrian and Carboniferous ages for the Araba and Naqus formations, respectively. Thermal demagnetization constrained these dates using established polarity timescales. Mineralogical data indicated that the Araba Formation originated from an igneous source, while the Naqus Formation had a mixed metamorphic-igneous provenance. The integrated AMS and paleomagnetic data reveal evidence of post-depositional deformation. Specifically, the clustering of maximum AMS axes in the NW–SE direction for both formations, suggests the initial presence of a primary depositional fabric. However, prevalent tectonic activity during the Cenozoic appears to have overprinted and modified this fabric through deformation related to rifting of the Gulf of Suez region. Through this novel multi-proxy approach, we have resolved long-standing uncertainties regarding the formations' depositional ages. Our study thereby provides the first chronostratigraphic framework for these strategically important sedimentary units, significantly advancing understanding of regional Paleozoic geology. Graphical abstract

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Kasimovian (late Pennsylvanian) cornute rugose corals from Egypt: taxonomy, facies and palaeogeography of a cool-water fauna from northern Gondwana

El-Desouky,

Herbig,

Kora

2023

Swiss J Palaeontol

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A strongly endemic Upper Pennsylvanian (Kasimovian) rugose coral association consisting of small, mostly non-dissepimented, simple structured and poorly diversified species is studied from the lower member of the Aheimer Formation (Western side of the Gulf of Suez, Egypt). The unit is composed of grey, silty mudstone intercalated with thin, ferruginous, silty dolostone–limestone and calcareous siltstone beds. Ten taxa from four families were identified. Four species of the Antiphyllinae are new; Actinophrentiscrassithecata n. sp., Lytvolasmaaheimerensis n. sp., L.paraaucta n. sp. and Monophyllumgalalaensis n. sp. Besides, Rotiphyllumexile de Groot, 1963 and Bothrophyllumokense Kossovaya, 2001 were identified; four taxa remain in open nomenclature (Lytvolasma cf. canadense, Zaphrentites cf. parallela, Zaphrentites sp. and Ufimia sp.). Rejuvenation, encrustation and bioerosion phenomena are rare. Attachment structures during mature stages are not evident; attachment scars in the apical parts are also rare. Growth patterns and embedding in the muddy deposits indicates that the corals lived as mudstickers in soft substrate. Recrystallization, dolomitization and ferrugination of open pore spaces inside the corals are the most common diagenetic features. The corals from the lower Aheimer Formation represent a typical cyathaxonid fauna that was adapted to high clastic input and turbid waters in a restricted, sheltered, episodically storm-swept inner ramp environment in an embayment of the southern shelf of the Palaeotethys. A time-averaged ramp model shows a regressive development from a mixed carbonate–siliciclastic open inner ramp setting during the Moscovian to the restricted inner ramp of the lower Aheimer Formation (Kasimovian) and following peritidal to fluvial environments of the Gzhelian. General and local palaeoclimatic considerations indicate cooling. Besides relations to northern Spain that root Egypt in the western Palaeotethys, connections existed via the Donets Basin (and the southern Urals) to the Cordilleran–Arctic–Uralian realm which is a cool water province during the Lower and Middle Permian. The Egyptian fauna appears to be a precursor of the anti-tropical cyathaxonid fauna of the latter time slice and also of the Lower Permian cool-water faunas of the east Cimmerian peri-Gondwana terranes.

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Late Moscovian phylloid algal-microbial mounds from Wadi Araba, north Eastern Desert, Egypt: a new construction model and paleogeographic distribution

Cited by 3 publications

References 33 publications

Macrofaunal communities and microfacies analysis of the upper Campanian-Maastrichtian Sudr Formation at the Galala Plateaus, north Eastern Desert, Egypt: paleoenvironmental and paleobiogeographical implications

Macrofaunal communities and microfacies analysis of the upper Campanian-Maastrichtian Sudr Formation at the Galala Plateaus, north Eastern Desert, Egypt: paleoenvironmental and paleobiogeographical implications

Integrating facies, mineralogy, and paleomagnetism to constrain the age and provenance of Paleozoic siliciclastic sedimentary rocks along the northern Gondwana margin: insights from the Araba and Naqus formations in western Gulf of Suez, Egypt

Kasimovian (late Pennsylvanian) cornute rugose corals from Egypt: taxonomy, facies and palaeogeography of a cool-water fauna from northern Gondwana

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