Mesozoic geology of the Agulhas Bank, South Africa

 

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dc.contributor.author Du Toit, Schalk Roelof en_ZA
dc.date.accessioned 2016-05-16T11:55:04Z
dc.date.available 2016-05-16T11:55:04Z
dc.date.issued 1975 en_ZA
dc.identifier.citation Du Toit, S. 1975. Mesozoic geology of the Agulhas Bank, South Africa. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/19680
dc.description Includes bibliogaphic references. en_ZA
dc.description.abstract This thesis is concerned with the Mesozoic geological history of the Agulhas Bank on the continental shelf off the south coast of South Africa. It incorporates the results of oil exploration activities in the area since 1967: this involved the drilling of 17 boreholes (43 000 m) and the recording of about 24 000 line km of seismic reflection profiles. A structural investigation was facilitated by regional mapping of two key seismic reflectors; these are acoustic basement (horizon D at tile base of the Mesozoic) and a prominent reflector and unconformable horizon (horizon C) within the Lower Cretaceous. An additional two horizons were mapped over part of the Agulhas Bank; they are horizons A (base of the Uppper Cretaceous) and 11 (within the Lower Cretaceous). These reflector horizons were tied to stratigraphic control points in the boreholes. A stratigraphic framework was erected and correlations were established by means of a study of borehole cuttings samples, cores and sidewall cores and a variety of wireline logs. The existing Mesozoic litho-stratrigraphic framework was supplemented by defining reference stratotypes for the Swart¬kops end Sundays River formations. Subsurface stratotypes are defined for two new units; they are termed the Infanta and Alphard Formations. A subsurface reference stratotype for the Alexandria Formation is presented. A chronostratigrapic framework and correlations, which became available through a study of microfauna and microflora were intergrated with structural and lithostratigraphic information. As a consequence four litho-tectonic units are recognised; their evolution is discussed also in terms of varying rates of sediment accumulation. The Mesozoic geologic history of the Agulhas bank is discussed in reference to the plate tectonic history. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Geological Sciences en_ZA
dc.title Mesozoic geology of the Agulhas Bank, South Africa en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Geological Sciences en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Du Toit, S. R. (1975). <i>Mesozoic geology of the Agulhas Bank, South Africa</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/19680 en_ZA
dc.identifier.chicagocitation Du Toit, Schalk Roelof. <i>"Mesozoic geology of the Agulhas Bank, South Africa."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1975. http://hdl.handle.net/11427/19680 en_ZA
dc.identifier.vancouvercitation Du Toit SR. Mesozoic geology of the Agulhas Bank, South Africa. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1975 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/19680 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Du Toit, Schalk Roelof AB - This thesis is concerned with the Mesozoic geological history of the Agulhas Bank on the continental shelf off the south coast of South Africa. It incorporates the results of oil exploration activities in the area since 1967: this involved the drilling of 17 boreholes (43 000 m) and the recording of about 24 000 line km of seismic reflection profiles. A structural investigation was facilitated by regional mapping of two key seismic reflectors; these are acoustic basement (horizon D at tile base of the Mesozoic) and a prominent reflector and unconformable horizon (horizon C) within the Lower Cretaceous. An additional two horizons were mapped over part of the Agulhas Bank; they are horizons A (base of the Uppper Cretaceous) and 11 (within the Lower Cretaceous). These reflector horizons were tied to stratigraphic control points in the boreholes. A stratigraphic framework was erected and correlations were established by means of a study of borehole cuttings samples, cores and sidewall cores and a variety of wireline logs. The existing Mesozoic litho-stratrigraphic framework was supplemented by defining reference stratotypes for the Swart¬kops end Sundays River formations. Subsurface stratotypes are defined for two new units; they are termed the Infanta and Alphard Formations. A subsurface reference stratotype for the Alexandria Formation is presented. A chronostratigrapic framework and correlations, which became available through a study of microfauna and microflora were intergrated with structural and lithostratigraphic information. As a consequence four litho-tectonic units are recognised; their evolution is discussed also in terms of varying rates of sediment accumulation. The Mesozoic geologic history of the Agulhas bank is discussed in reference to the plate tectonic history. DA - 1975 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1975 T1 - Mesozoic geology of the Agulhas Bank, South Africa TI - Mesozoic geology of the Agulhas Bank, South Africa UR - http://hdl.handle.net/11427/19680 ER - en_ZA


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