Petrography and diagenesis of the Samh formation and younger sediments, north of Mersa Alam area, Red Sea Coast, Egypt

Abou-Khadrah, A. M.; Wahab, S.A.

doi:10.1016/s0731-7247(84)80022-1

Cited by 3 publications

(6 citation statements)

References 5 publications

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“…The most probable match of normal magnetozones is with chron C3B, the top part of the member being the base of C3A and the upper half of C3A being missing due to erosion. Evidence of a disconformity between the Samh and Gabir members is seen locally south of Quseir [sections such as wadi El Allam, Beadnell (1924)], where the Gabir Member oversteps directly onto the evaporites Abou‐Khadrah & Wahab 1984; Youssef 1986). However, there may also be local evidence of erosional‐based units, such as at wadi Quseir el Qadim (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…From the magnetostratigraphy and the limited biostratigraphy, the Samh Member is age‐equivalent to part of the Zeit Formation. Sabkha‐type depositional sequences are not known from the Samh Member either in the Quseir area or further south Abou‐Khadrah & Wahab 1984; Thiriet et al 1986), so it is unlikely that the Samh clastics were deposited at exactly the same time as evaporites in the basin centre. The Samh Member may represent interrupted intervals of partial marine re‐flooding of the Red Sea basin, temporarily ceasing evaporite formation in the more basinal parts of the Red Sea.…”

Section: Discussionmentioning

confidence: 99%

“…The Wardan Formation consists of shallow marine clastics and carbonates, and is divisible in most sections into an upper and a lower unit. These have been referred to as the Gabir and Samh members by various workers (El Heiny 1982; Abou‐Khadrah & Wahab 1984; Youssef 1984; Said 1990a; Fig. 2) in the sections further south around Mersa ’Alam (132 km SE of Quseir).…”

Section: The Study Areamentioning

confidence: 99%

“…The case for an unconformity between the Abu Dabbab and Wardan formations in the NW Red Sea (Roussel et al 1986; Purser et al 1990) is overstated. Around Mersa ’Alam, the Samh Member may also contain reddened soil horizons and other evidence of emergence Abou‐Khadrah & Wahab 1984; Youssef 1986). South of Mersa ’Alam, a marine limestone unit, the Um Gheig Formation Abou‐Khadrah & Wahab 1984; Said 1990a), is locally present at the boundary of the Wardan and Abu Dabbab formations.…”

Section: The Study Areamentioning

confidence: 99%

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Magnetostratigraphy and sedimentary evolution of the late Miocene to early Pleistocene sediments, Quseir region, Egyptian Red Sea

et al. 1998

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An integrated sedimentological and magnetostratigraphic study has allowed a detailed understanding of the late Miocene to early Pleistocene evolution of the sediments in the Quseir region of the Egyptian Red Sea coast. Palaeomagnetic samples were collected from sections in six wadis, covering the Shagara Formation, the Gabir and Samh members of the Wardan Formation, and the Abu Dabbab Formation evaporites. Remanence properties are carried by magnetite, haematite and goethite. The characteristic remanence is typically carried by detrital magnetite and haematite, with more recent overprints predominantly associated with haematite and goethite, produced by the weathering of diagenetic pyrite. The magnetostratigraphy has allowed the following detailed age assignments for the lithostratigraphic units. The Shagara Formation ranges in age from late Pliocene (late Piacenzian) to middle Pleistocene (0.6–2.5 Ma). The Gabir Member is latest Messinian to earliest Piacenzian in age (≈3.5–5.5 Ma) and the Samh Member, late Tortonian to mid‐Messinian (≈6.0–7.5 Ma). The age of the top of the Abu Dabbab Formation is probably mid‐Tortonian (≈8 Ma). Disconformities occur between all the lithostratigraphic units, with a local angular unconformity between the Shagara and Wardan Formations. Lowstands in global sea level appear to have a strong influence on the timing of these disconformities. Characteristic mixed alluvial and reef facies of the Shagara formation are a response to the ephemeral wetter climate following the initiation of northern hemisphere glaciation at ≈2.4 Ma, enhanced by rift‐margin uplift of basement complexes to the west. This tectonic activity was concentrated in the early Piacenzian. The marine Gabir Member was deposited during the early Pliocene and latest Messinian high‐sea‐level stands. The late Tortonian/early Messinian age and sedimentological character of the Samh Member indicates this unit was affected by marine flooding events, which ultimately produced, during drawdown phases, the off‐shore Zeit Formation evaporites in half‐graben depocentres.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: The Study Areamentioning

confidence: 99%

Section: The Study Areamentioning

confidence: 99%

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Magnetostratigraphy and sedimentary evolution of the late Miocene to early Pleistocene sediments, Quseir region, Egyptian Red Sea

et al. 1998

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“…Um Gheig is the second formation, rests on the Abu Dabbab and distributed in the upper region of the studied site, is a dense dolomitic bed. Abou Khadrah and Abdel Wahab (1984) described this formation as a base of Samh Formation. Shagra Formation is located near or along the shoreline in the studied site ( Figure 3); it is more calcareous than Gabir Formation.…”

Section: Geological Settingmentioning

confidence: 96%

Soil geotechnical characteristics for seismic risk mitigation at the southern extension of Marsa Alam city, Egypt

Fat-Helbary

El-Faragawy

Hamed

2019

NRIAG Journal of Astronomy and Geophysics

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The seismic hazard assessment for mitigating the seismic risk is an essential step before starting construction of a new settlement. One of the tools that could help in achieving this goal is the application of seismic refraction method for evaluating the geotechnical characteristics and dynamic properties of the soil deposits. Dynamic characteristics are fundamental for understanding the response of the soil under dynamic loading. Shallow refraction technique is in-situ test depends on the computation of seismic wave velocities which penetrating the soil. A total number of 88 compressional (P) and Shear wave (S) seismic refraction profiles have been conducted at the southern extension of Marsa Alam city on the Red Sea coast. The average Pand S-wave velocities were estimated for the subsurface layers consequently. Microzonation map for each layer was released by the spatial interpolation of data. In addition, the iso-thickness map was created for manifesting the soil thickness all over the studied area. Geotechnical parameters of the subsurface sediments were computed, as well as the zonation maps for density and Nvalue parameters have been created. The obtained maps emphasize that the first layer could be considered as foundation soil due to it is relatively stiffness.

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Geochemistry of the Miocene Sandstone and Shale at Um Greifat Area, Central Eastern Desert, Egypt: Implications to Provenance, Tectonic Setting and Rare Earth Elements Potentiality

HASHAD

Soliman

Saleh

et al. 2020

Nuclear Sciences Scientific Journal

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The studied Miocene sandstone and shale rocks are belonging to El-Ranga Formation. Petrographically, the sampled sandstone is classified as sublitharenite with evidence on variable transportation distances and derivation from sedimentary, igneous and/or metamorphic rocks. The iron oxides appear as the dominant cementation while quartz is the main matrix material in this sandstone. On the other hand, the shale appears as silty-to sandy shale consisting of fine to very fine, subangular to angular and moderate to poor sorted grains. Mutual bands of the black manganese oxides and brownish-yellow iron oxides are sometimes observed with indication of silica-rich solutions post-dated the formation of these bands.Geochemically, the studied rocks were confirmed as sublitharenite and shale rich in iron. The active continental margin and island arc appeared the probable tectonic settings for Um-Greifat sandstone and shale, respectively. The quartzose sedimentary provenance and the mafic igneous provenance are expected as the primary provenances for the sandstone and shale respectively. The total REE content in the sandstone samples ranged between 0.49% and 0.83% while in the shale samples it ranged from 288 to 526 ppm and the accessory minerals are the main factor controlling the REE concentration and distribution particularly in Um-Greifat sandstone.

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Petrography and diagenesis of the Samh formation and younger sediments, north of Mersa Alam area, Red Sea Coast, Egypt

Cited by 3 publications

References 5 publications

Magnetostratigraphy and sedimentary evolution of the late Miocene to early Pleistocene sediments, Quseir region, Egyptian Red Sea

Magnetostratigraphy and sedimentary evolution of the late Miocene to early Pleistocene sediments, Quseir region, Egyptian Red Sea

Soil geotechnical characteristics for seismic risk mitigation at the southern extension of Marsa Alam city, Egypt

Geochemistry of the Miocene Sandstone and Shale at Um Greifat Area, Central Eastern Desert, Egypt: Implications to Provenance, Tectonic Setting and Rare Earth Elements Potentiality

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