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| Titel |
Tectonic setting of south Sinai metamorphic belts |
| VerfasserIn |
Y. Sultan, T. Abu-Alam, K. Stüwe |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066107
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| Zusammenfassung |
| The northernmost part of the Neoproterozoic Arabian-Nubian Shield (Sinai) comprises
volcano-sedimentary metamorphic complexes evolved during the Pan-African Orogeny.
Distinction among Sinai metamorphic complexes is largely based on the fact that they are
located in different area (some tens of kilometers apart) and are separated by extensive
regions of post-tectonic granitoids. Here we propose that their relationship may be
understood within the same framework of Pan-African tectonics as known for the eastern
Desert of Egypt. Comparing the structural elements and the metamorphic grade of these
metamorphic complexes reveals that the south Sinai metamorphic complexes were subjected
to four deformational events, the earliest tectonic event (D1) is differing in the
high-grade rocks of Feiran-Solaf metamorphic complex from the low-grade rocks of
Sa’al –Zaghra and Kid complexes, in which Feiran-Solaf complex is expressed by
extensional tectonic regime and compressional regime for Sa’al –Zaghra and Kid
complexes. The second deformational event (D2) related to a contractional regime
of thrust related shear zones and its associated thrust faults. This deformation is
related to the major collision and accretion between East and west Gondwana.
The third tectonic event (D3) represents oblique sinistral NW-SE transpressional
regime. This event is known to have formed the Najd Fault System equivalent to the
same deformation in the Eastern Desert. The last tectonic event (D4) during the
Pan-African Orogeny reveals change in the stress regime from shortening NE-SW to
shortening NW-SE and WNW-ESE revealing open concentric folds trending NE-SE to
NNE-SSW followed by extension NW-SE associated with intrusion of NE-SW alkaline
suite bodies. Dextral NW-SE shear zones system was recorded in the field and
probably represents reactivation of the Najd Fault System during the Oligo-Miocene. |
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