Geology of the Al-Amar-Idsas Region of the Arabian Shield

Nawab, Zohair A.

doi:10.1016/b978-0-08-024467-9.50008-3

Cited by 16 publications

(7 citation statements)

References 18 publications

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“…These rocks, collectively known as the Urd group, have been interpreted to represent either the sedimentary fill of a back-arc basin floored by oceanic crust (Nawab, 1979;Al-Shanti and Gass, 1983) or an accretionary wedge and associated oceanic crust that were compressed during a collisional event (Al-Shanti and Mitchell, 1976;Schmidt and others, 1979; Stacey and others,t"-j>«M"^) .…”

Section: Ad Dawadimi Provincementioning

confidence: 99%

U/Pb zircon geochronology of the southern part of the Nabitah mobile belt and Pan-African continental collision in the Saudi Arabian Shield

Stoeser¹,

Stacey²,

Greenwood³

et al. 1985

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Section: Ad Dawadimi Provincementioning

confidence: 99%

U/Pb zircon geochronology of the southern part of the Nabitah mobile belt and Pan-African continental collision in the Saudi Arabian Shield

Stoeser¹,

Stacey²,

Greenwood³

et al. 1985

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“…This association has been interpreted as remnants of oceanic islands, obducted together with ophiolites along destructive plate boundaries and marking tectonic sutures generated during the closure of small ocean basins (Frisch & AI-Shanti 1977;Nawab 1979). Dating of the metagabbro-diorite complex in the Eastern Desert of Egypt indicates emplacement between 987 and 876 Ma (Hashad 1980;Abdel-Rahman & Doig 1987).…”

mentioning

confidence: 99%

Pan-African magmatism in the Wadi El-Imra district, Central Eastern Desert, Egypt: geochemistry and tectonic environment

Furnes¹,

El-Sayed

Khalil

et al. 1996

JGS

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The Late Proterozoic rocks of the Wadi El-lmra district of the Central Eastern Desert, Egypt, comprise a metagabbro-diorite complex (oldest) and Older and Younger Granitoid complexes. Trace element characteristics show that the basic and granitoid rocks are of calc-alkaline affinity, but some of the Younger Granitoids grade into alkaline granites. The values of the the basic and granitoid rocks range from +8.3 to f4.Y. and Nd model ages are younger or rather similar to crystallization ages. These data suggest a predominant depleted mantle derivation. indicating formation by subduction in an oceanic setting. REE patterns of the granitoid rocks suggest different modes of petrogenesis. This, coupled with the occurrence of amphibolite xenoliths in the Older Granitoids, may indicate that some of these rocks represent partial melts from basic rocks that have been amphibolitized at deep crustal levels of the oceanic arc.

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“…Al Amar Fault is a westward steeply dipping N-trending shear zone extending over ≈200 km long, with 0.5-4 km average width. Because of the presence of relatively smallsized lensoidal blocks and fragments of ophiolites and carbonate-altered ultramafic rock (listwaenite and fuchsitetalc schist), this structure is considered by [33], and [34] as a suture zone; namely Al Amar Suture Zone. It is worthy to mention here that ophiolitic components are not encountered in the mapped area.…”

Section: Al Amar Suture Zonementioning

confidence: 99%

Application of Finite Strain Technique for Deformed Lithologies in Al Amar Suture, Eastern Arabian Shield

Kassem¹,

Hamimi²

2014

TOGEOJ

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Finite strain technique was applied for Abt schist, sheared granitoids and volcanosedimentary rocks exposed at Al Amar area, eastern Arabian Shield, in an attempt to decipher the relationship of these lithologies to nappe contacts and to clarify the nature of subhorizontal foliation pervasively recorded in the area. The R f /φ and Fry methods were utilized on quartz and feldspar porphyroclasts, as well as on mafic crystals, such as hornblende and biotite, in eighteen samples. The X/Z axial ratios ranged from 1.12 to 4.99 for R f /φ method and from 1.65 to 4.00 for Fry method. The direction of finite strain for the long axes displayed clustering along the WNW trend (occasionally N) with slight plunging. The Z axes were subvertical and associated with a subhorizontal foliation. The data revealed oblate strain symmetry (flattening) and the strain magnitudes showed no considerable increase towards the tectonic contacts. The obtained finite-strain data demonstrated that the sheared granitoids are mildly to moderately deformed. It is suggested that the accumulation of finite strain was not associated with any significant volume change. The penetrative subhorizontal foliation was concurrent with thrusting and showed nearly the same attitudes of tectonic contacts with the overlying nappes. Field relations and observations, together with finite stain data, are inconsistent with the proposed idea that nappes in orogens resulted from simple-shear deformation.

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Geology of the Al-Amar-Idsas Region of the Arabian Shield

Cited by 16 publications

References 18 publications

U/Pb zircon geochronology of the southern part of the Nabitah mobile belt and Pan-African continental collision in the Saudi Arabian Shield

U/Pb zircon geochronology of the southern part of the Nabitah mobile belt and Pan-African continental collision in the Saudi Arabian Shield

Pan-African magmatism in the Wadi El-Imra district, Central Eastern Desert, Egypt: geochemistry and tectonic environment

Application of Finite Strain Technique for Deformed Lithologies in Al Amar Suture, Eastern Arabian Shield

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