Tectonics and mineralization of Wadi Allaqi, south Eastern Desert, Egypt

2.50
Hdl Handle:
http://hdl.handle.net/10547/606076
Title:
Tectonics and mineralization of Wadi Allaqi, south Eastern Desert, Egypt
Authors:
El Kazzaz, Yahia Abbas Hamed Abdalla
Abstract:
Neoproterozoic volcanic, sedimentary and volcano-sedimentary rocks of central Wadi Allaqi were deformed and metamorphosed to greenschist facies during the Pan-African orogeny. Three major, geochemically and lithostratigraphically distinct, tectonic-stratigraphy Successions with an intermediate tectonically-emplaced unit of ophiolitic rocks (Gebel Taylor Wedge), which have been metamorphosed to blueschists facies prior to emplacement, are recognised. The tectonic pile has been intruded by four granitic plutons and basic igneous sills, which were emplaced at various stages in the tectonic history. A series of large-scale thrust duplexes with a few major nappe-like folds and shear-zones, the most conspicuous of which is the Allaqi Shear-zone, structurally dominate the area. A complex polyphase structural history has been deduced consisting of earlier ductile and late more brittle deformation phases and this has been related to the regional metamorphic development. A gold mineralized quartz vein system was emplaced syn-tectonically along the first deformation (D1) shear-zones. Data from structures, petrography, fluid inclusions and stable isotopes of oxygen and hydrogen tend to support a metamorphic provenance for the auriferous fluids. The petrological, geochemical and structural evidence strongly support a back-arc basin environment for the sedimentary development of central Wadi Allaqi before the Pan-African Orogeny. A single Wilson Cycle is proposed for the evolution of the area, in which following an extensional phase, during which the marginal elements of the ancient Mozambique Ocean (in the sense of Dalziel 1991) were developed. Back-arc sedimentary rocks and volcaniclastic rocks were metamorphosed and transported as a thrust-duplex system northward over the Nile Craton and any associated marginal sedimentary sequence.
Citation:
El Kazzaz, Y.A.H.A. (1995) 'Tectonics and mineralization of Wadi Allaqi, south Eastern Desert, Egypt', PhD thesis. University of Luton.
Publisher:
University of Bedfordshire
Issue Date:
Aug-1995
URI:
http://hdl.handle.net/10547/606076
Type:
Thesis or dissertation
Language:
en
Description:
A thesis submitted to the Faculty of Science & Computing, University of Luton, in partial fulfilment of the requirements for the degree of Doctor of Philosophy. Collaborating Institution: Egyptian Geological Survey and Mining Authority.
Appears in Collections:
PhD e-theses

Full metadata record

DC FieldValue Language
dc.contributor.authorEl Kazzaz, Yahia Abbas Hamed Abdallaen
dc.date.accessioned2016-04-20T12:26:49Zen
dc.date.available2016-04-20T12:26:49Zen
dc.date.issued1995-08en
dc.identifier.citationEl Kazzaz, Y.A.H.A. (1995) 'Tectonics and mineralization of Wadi Allaqi, south Eastern Desert, Egypt', PhD thesis. University of Luton.en
dc.identifier.urihttp://hdl.handle.net/10547/606076en
dc.descriptionA thesis submitted to the Faculty of Science & Computing, University of Luton, in partial fulfilment of the requirements for the degree of Doctor of Philosophy. Collaborating Institution: Egyptian Geological Survey and Mining Authority.en
dc.description.abstractNeoproterozoic volcanic, sedimentary and volcano-sedimentary rocks of central Wadi Allaqi were deformed and metamorphosed to greenschist facies during the Pan-African orogeny. Three major, geochemically and lithostratigraphically distinct, tectonic-stratigraphy Successions with an intermediate tectonically-emplaced unit of ophiolitic rocks (Gebel Taylor Wedge), which have been metamorphosed to blueschists facies prior to emplacement, are recognised. The tectonic pile has been intruded by four granitic plutons and basic igneous sills, which were emplaced at various stages in the tectonic history. A series of large-scale thrust duplexes with a few major nappe-like folds and shear-zones, the most conspicuous of which is the Allaqi Shear-zone, structurally dominate the area. A complex polyphase structural history has been deduced consisting of earlier ductile and late more brittle deformation phases and this has been related to the regional metamorphic development. A gold mineralized quartz vein system was emplaced syn-tectonically along the first deformation (D1) shear-zones. Data from structures, petrography, fluid inclusions and stable isotopes of oxygen and hydrogen tend to support a metamorphic provenance for the auriferous fluids. The petrological, geochemical and structural evidence strongly support a back-arc basin environment for the sedimentary development of central Wadi Allaqi before the Pan-African Orogeny. A single Wilson Cycle is proposed for the evolution of the area, in which following an extensional phase, during which the marginal elements of the ancient Mozambique Ocean (in the sense of Dalziel 1991) were developed. Back-arc sedimentary rocks and volcaniclastic rocks were metamorphosed and transported as a thrust-duplex system northward over the Nile Craton and any associated marginal sedimentary sequence.en
dc.language.isoenen
dc.publisherUniversity of Bedfordshireen
dc.subjectF610 Applied Geologyen
dc.subjecttectonic studiesen
dc.subjectmineralsen
dc.subjectEgypten
dc.titleTectonics and mineralization of Wadi Allaqi, south Eastern Desert, Egypten
dc.typeThesis or dissertationen
dc.type.qualificationnamePhDen_GB
dc.type.qualificationlevelPhDen
dc.publisher.institutionUniversity of Bedfordshireen
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