Palaeomagnetic studies of some Palaeozoic sediments, southwest Sinai, Egypt

Abdeldayem, Abdelaziz; Kafafy, Aziz M.; Tarling, D. H.

doi:10.1016/0040-1951(94)90212-7

Cited by 11 publications

(2 citation statements)

References 14 publications

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“…The question arising now is that if local tectonics are responsible for the anomalous magnetization directions in the Tertiary rocks, why have they not affected the results from the underlying Palaeozoic rocks obtained by Abdeldayem et al (1994)? The answer could lie in one of the following possibilities.…”

Section: Discussion Of the Results From The Tertiary Units Of The Sinaimentioning

confidence: 99%

“…Kohn & Eyal 1981;Bentor 1985;Riva 1986;Bennett & Mosley 1987;Courtillot et al 1987a, b;Garfunkel 1988). Nonetheless, few palaeomagnetic studies have been carried out (Wassif 1991;Heimann & Ron 1993;Kafafy & Abdeldayem 1993;Abdeldayem et al 1994;Kafafy et al this volume). The present study concerns the palaeomagnetic characteristics of some Palaeocene, Lower Eocene and Lower Miocene sedimentary rocks from the Wadi Feiran area in the south-west of the Sinai peninsula, i.e.…”

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Palaeomagnetism of some Tertiary sedimentary rocks, southwest Sinai, Egypt, in the tectonic framework of the SE Mediterranean

Abdeldayem¹,

Tarling²

1996

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Two hundred and fifteen limestone core samples of Palaeocene (nine sites), Lower Eocene (ten sites) and Miocene (nine sites) ages were collected from the Wadi Feiran area, southwest Sinai. The majority of samples contained magnetic vectors that were consistent in direction during thermal and alternating field demagnetization. Normal and reversed polarities were identified that passed a reversal test, but the bedding tilts were too small to enable an adequate fold test to be undertaken. When compared to coeval palaeomagnetic poles for stable Africa, the Sinai palaeomagnetic poles are consistently displaced by some 30 ~ . This is unlikely to be due to crustal translation between Sinai and Africa, but is attributed to local tectonic rotations of fault blocks in a similar way as for other areas in the SE Mediterranean. In the Suez area, the rotation has been mainly about horizontal axes and is associated with the opening of the Gulf of Suez.

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Section: Discussion Of the Results From The Tertiary Units Of The Sinaimentioning

confidence: 99%

mentioning

confidence: 99%

Palaeomagnetism of some Tertiary sedimentary rocks, southwest Sinai, Egypt, in the tectonic framework of the SE Mediterranean

Abdeldayem¹,

Tarling²

1996

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Paleomagnetism of Late Neoproterozoic African Dike Swarms from the South Eastern Desert and the Paleo-Neoproterozoic Dataset from Egypt

Saleh

2020

Pure Appl. Geophys.

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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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Palaeomagnetic studies of some Palaeozoic sediments, southwest Sinai, Egypt

Cited by 11 publications

References 14 publications

Palaeomagnetism of some Tertiary sedimentary rocks, southwest Sinai, Egypt, in the tectonic framework of the SE Mediterranean

Palaeomagnetism of some Tertiary sedimentary rocks, southwest Sinai, Egypt, in the tectonic framework of the SE Mediterranean

Paleomagnetism of Late Neoproterozoic African Dike Swarms from the South Eastern Desert and the Paleo-Neoproterozoic Dataset from Egypt

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

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