Late Precambrian ophiolitic mélange in the eastern desert of Egypt

Shackleton, Robert; Ries, A. C.; Graham, Rod; Fitches, W. R.

doi:10.1038/285472a0

Cited by 164 publications

(47 citation statements)

References 8 publications

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“…The largest mass constitutes Gabal E1 Rubshi where the serpentinites enclose boudinaged chromite lenses and are intercalated by thin layers of highly foliated metasediments. Boudinaged chromite lenses are also described from Wadi Ghadir area (EL-SHAR~WY and EL BAYOUMI, 1979) and metasedimentary intercalations are reported from the Barramiya area (SHACKLETON et al, 1980). The metasedimentary intercalations are believed to define thrust planes along which the ultramafic masses have glided.…”

Section: Supracrustal Rocks Abu Ziran Groupmentioning

confidence: 94%

“…Parallelism between lineation and fold axes is a common feature in mylonite zones (HoBBs et al, 1976). SHACKLETON et al (1980) consider the observed stretching parallel to the direction of transport and therefore they assume that the overlying supracrustal rocks were thrust to the NW. We believe, based primarily on the south-westerly vergence of the minor folds and that the amphibolite and quartz lenses are elongated parallel to the b-axis, that the supracrustal Abu Ziran Group was thrust from the NE to the SW.…”

Section: Gabal Meatiq Areamentioning

confidence: 99%

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Tectonic evolution of the basement complex in the central eastern desert of Egypt

1984

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With 2 figures ZusammenfassungDie Gesteine des /igyptischen Kristallins sind in drei Hauptgruppen unterteilt: Meatiq Group (/ilteste), Abu Ziran Group und Hammamat Group (jiingste); die letzten zwei Gruppen geh6ren dem Pan-Afrikanischen Zyklus an. Die Meatiq-Gruppe stellt einen alten Sokkel dar, der in Gneisdomen auftritt. Die Abu-Ziran-Gruppe umfaBt die Geosynklinal-Assoziation, die aus einer unteren ophiolitischen Einheit besteht, iiberlagert von Sedimenten, volkanoklastischen Sedimenten und lokalen intermedi/iren Vulkaniten mit ausgepr/igten Inselbogen-Eigenschaften. Die Hammamat-Gruppe besteht aus Molassetyp klastischen Sedimenten und zeitlich assoziierte Dokhan Volcanics andesitischer his rhyolitischer Zusammensetzung. Die syn-bis sp~it-tektonische Kalkalkaligranite sind die plutonischen Aequivalente der Dokhan Volcanics.Das untersuchte Gebiet liegt im Vorland-Falten-und Decken-Gtirtel eines Kontinentalrand-Orogens. Ophiolite, insbesondere die Serpentinite, treten entlang dem Ausbii3 der [)berschiebungsflfiche zwischen dem Meatiq-Sockelstockwerk und der Abu-Ziran-Decke auf.Schwellen in Form zweier Geantiklinalen waren Zentren aktiver kalkalkaliner magmatischer T/itigkeit, begleitet zumindest yon Goldvererzungen. AbstractThe Egyptian basement rocks are gathered into three major rock groups, viz. Meatiq Group (oldest), Abu Ziran Group and Hammamat Group (youngest); the last two groups belong to the Pan-African orogenic cycle. The Meatiq Group is an old crystalline basement cropping out in gneiss domes. The Abu Ziran Group comprises the geosynclinal association which is formed of a lower ophiolite unit overlain by metasediments, volcanoclastics and locally intermediate volcanics having clear island arc characters. The Hammamat Group comprises molasse-type clastics, and penecontemporaneous Dokhan Volcanics of andesite to rhyolite composition; syn to late-tectonic calc-alkaline granites are the plutonic equivalents of the Dokhan Volcanics.The studied area lies within the foreland fold and thrust belt of a continental margin orogen. Ophiolites, particularly serpentinites, crop out along the trace of the sole thrust between the Meatiq infrastructure and the imbricated Abu Ziran nappe. Swells, developed along two geanticlines, were centers of marked calc-alkaline magmatic activity associated, at least, with gold mineralization. R~sum~Les roches du socle ~gyptien se r~partissent en trois groupes majeurs: Meatiq Group (le plus ancien); Abu Ziran Group et Hammamat Group (le plus r6cent); les deux derniers groupes appartiennent au cycle orog6nique Pan-Africain.Le Meatiq Group est un socle cristallin ancien affleurant en d6mes gneissiques. Le Abu Ziran Group comprend une association g6osynclinale form6e d'une unit6 ophiolitique *) Authors' addresses: S. EL-GABY, O. EL-NADY and A. KHUDEIR, Department of Geology, Assuit University, Assuit, Egypt.Geologische Rundschau 73, 3, 1019-1036, Stuttgart 1984 1019 Des d6mes, d6velopp6s le long de deux g6anticlinaux, ont 6t6 les centres d'une forte activit6 magmatique calco-alcaline ...

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Section: Supracrustal Rocks Abu Ziran Groupmentioning

confidence: 94%

Section: Gabal Meatiq Areamentioning

confidence: 99%

Tectonic evolution of the basement complex in the central eastern desert of Egypt

1984

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“…The occurrence of ophiolite complexes and their association with calc-alkaline volcanic rocks of island arc affinities have led to the conclusion that subduction processes were responsible for the Pan African mobile belts of NE Africa and Saudi Arabia [11][12][13][14][15].…”

Section: General Geology and Sample Descriptionsmentioning

confidence: 99%

Osmium isotope systematics of the Proterozoic and Phanerozoic ophiolitic chromitites: In situ ion probe analysis of primary Os-rich PGM

Ahmed

Hanghøj

Kelemen

et al. 2006

Earth and Planetary Science Letters

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In-situ 187 Os/ 188 Os ratios are determined on Os-rich platinum-group minerals in podiform chromitites both in the Proterozoic ophiolite, Eastern Desert, Egypt, and in the Os/ 188 Os ratios combined with the spinel chemistry and high PGE contents of the PGE-rich chromitite in the Oman ophiolite may give reliable evidence for high degree partial melting at a supra-subduction zone setting.Crustal contamination from the subducted slab, and assimilation of previously altered, lower crustal gabbro, may have contributed to the high Cr# spinel and radiogenic Os characteristics in chromitite formed in the mantle section and along the Moho transition zone, respectively.

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“…Division of the Eastern Desert of Egypt into northern, central and southern sections is based on basement type (Stern and Hedge, 1985). The Central Eastern Desert was formed by collapse of a small ocean basin or back arc basin (Shackleten et al, 1980). In general, the sedimentary rocks of the onshore part of the study area are separable into two great divisions: the pre-rifting Cretaceous-Eocene group and the post-rifting Oligocene and later sediments group.…”

Section: Geologic Settingmentioning

confidence: 99%

Structural mapping of Quseir area, northern Red Sea, Egypt, using high-resolution aeromagnetic data

et al. 2005

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Exploration in the northern Red Sea of Egypt has had little success in locating hydrocarbon accumulation.The main exploration problems in this region are the complex block faulting and Miocene salt structures. The complex basement block structure arises from the different ages of faults and the difficulty of determining the exact age relations. In this paper, we present a case study of structural mapping using application of the Euler method to high-resolution aeromagnetic data collected in the Quseir area of the northern Red Sea of Egypt. The results indicated that the area is affected by sets of fault systems, which are mainly trending in the NNW-SSE, NW-SE and NE-SW directions. The results also delineated boundaries of a long and wide magnetic body on the offshore part of the study area. This basement intrusion is most probably related to the Red Sea rift and perhaps associated with structures higher up in the sedimentary section. As a result, the area above this anomaly is highly recommended for further oil exploration. This example illustrates that high-resolution aeromagnetic surveys can help greatly in delineating subsurface structure in the northern Red Sea of Egypt.

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Late Precambrian ophiolitic mélange in the eastern desert of Egypt

Cited by 164 publications

References 8 publications

Tectonic evolution of the basement complex in the central eastern desert of Egypt

Tectonic evolution of the basement complex in the central eastern desert of Egypt

Osmium isotope systematics of the Proterozoic and Phanerozoic ophiolitic chromitites: In situ ion probe analysis of primary Os-rich PGM

Structural mapping of Quseir area, northern Red Sea, Egypt, using high-resolution aeromagnetic data

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