Aspects of Intraplate Deformation in Saharan Cratonic Basins

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dc.contributor.author Glover, Richard Timothy
dc.date.accessioned 2010-02-24T14:40:56Z
dc.date.available 2010-02-24T14:40:56Z
dc.date.issued 1999
dc.identifier.citation Glover, R. T. (1999) Aspects of Intraplate Deformation in Saharan Cratonic Basins, PhD thesis, Institute of Geography and Earth Sciences, Aberystwyth University. en
dc.identifier.uri http://hdl.handle.net/2160/4075
dc.description.abstract Intraplate deformation in the Murzuq Basin of SW Libya and the Illizi and Ghadames basins of eastern Algeria is investigated through the interpretation of regional seismic lines, gravity and magnetic surveys, satellite imagery and kinematic analyses of outcrop data. Five structural lineament trends have been identified: NNW-, NE- and N-striking Precambrian basement structures which are overprinted by ENE- and WNW-striking Late Carboniferous - Mesozoic fracture systems. These structural lineaments define distinct structural domains, with central Algeria characterised by NE-striking faults whilst NNW-striking faults are restricted to SW Libya and SE Algeria. This structural heterogeneity allowed basins to evolve independently of one another. NNW and N-striking faults were active during the Early Palaeozoic rifting of Gondwana and the opening and subsequent closure of the Proto-Tethyan Ocean. The kinematics of these early structural events are uncertain in the absence of a clear understanding of Early Palaeozoic plate margin movements. Analysis of Late Palaeozoic plate kinematics shows that Late Carboniferous NW-SE compression and uplift was followed by Triassic-Jurassic NW-SE extension of orthogonal fault systems in Algeria. Early Cretaceous N-S extension was replaced by Late Cretaceous- CenozoicN W-SE compression which promoted uplift and erosion of the basins. Apatite fission track analyses of Ordovician and Devonian samples, together with sonic velocity analysis of the Silurian Tanezzuft Formation, indicate maximum burial in the Jurassic-Early Cretaceous followed by c. I km of Late Cretaceous to Tertiary uplift and erosion. The Mesozoic - Cenozoic evolution of North Africa relates to three successive rifting events associated with the development of the Equatorial, South and North Atlantic and the opening and subsequent closure of the Tethyan Ocean. Movements of the North African Megashear system have transferred plate margin deformation into the cratonic interior largely by strike-slip reactivation of pre-existing fault systems. en
dc.description.sponsorship UWA studentship en
dc.language.iso en en
dc.publisher Aberystwyth University en
dc.title Aspects of Intraplate Deformation in Saharan Cratonic Basins en
dc.type Text en
dc.type.publicationtype doctoral thesis en


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