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| Titel |
Metamorphic evolution of the Qazaz metamorphic complex, Saudi Arabia |
| VerfasserIn |
Mahmoud Hassan, Tamer Abu-Alam, Kurt Stüwe, Sven Meyer, Cees Passchier |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250097600
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| Publikation (Nr.) |
 EGU/EGU2014-13201.pdf |
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| Zusammenfassung |
| Precambrian accretionary orogens largely contributed to continental growth, owing to
their high production rates of juvenile crust compared to Phanerozoic accretionary
orogens. The Pan-African orogeny is responsible for the evolution and growth of the
Arabian-Nubian Shield. The Qazaz metamorphic complex in Saudi Arabia is one of the
metamorphic complexes that were exhumed due to the activity of the largest Proterozoic
shear zone system on the Earth – the Najd Fault System. The Qazaz complex is
an example of an unusual new type of core-complex associated with crustal scale
strike-slip faulting. Petrography and thermodynamic modelling were used to study the
metamorphic evolution of the complex. The core of the complex records peak metamorphic
conditions of 560 – 640 oC and 7-8 kbar. The bounding strike-slip shear zones
operated at a temperature range of 400-600 oC while the pressure range varied
from 5 to 0.5 kbar over a very short distance within the shear zone. The complex
shows exhumation of about 25 km due to the activity of the Najd Fault System. |
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