The geochemistry and sedimentology of quaternary shelf sediments of the Tugela River, Natal, South Africa

 

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dc.contributor.advisor Willis, James P en_ZA
dc.contributor.author Felhaber, Taryl Ann en_ZA
dc.date.accessioned 2016-04-18T08:44:54Z
dc.date.available 2016-04-18T08:44:54Z
dc.date.issued 1984 en_ZA
dc.identifier.citation Felhaber, T. 1984. The geochemistry and sedimentology of quaternary shelf sediments of the Tugela River, Natal, South Africa. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18913
dc.description.abstract This thesis is comprised of geochemical, mineralogical and sedimentological studies of 101 sediment samples recovered from the continental shelf off the Tugela River Mouth, Natal, South Africa, and nine samples taken from the Lower Tugela River. The purpose of the research was to examine the geochemical nature of the sediments in relation to their particle size distributions and the hydrological conditions present in the area in order to elucidate the relationship between an inner shelf mud belt and an outer shelf mud belt located in the area. The river samples were analysed to help in understanding the changes undergone by the continental shelf sediments during their residence on the shelf. All samples were analysed for 10 major and 23 trace elements by X-ray fluorescence spectrometry, particle size distribution, carbonate and organic matter content. X-ray diffractograms were run on all samples to obtain qualitative mineralogy. Multivariate statistical tests were used to aid the interpretation of the data, and to statistically distinguish between the two mud belts. A detailed sedimentological model of the hydraulic populations of sediment in the area has been formulated. The information from this model, taken in conjunction with the mineralogy, provided a framework within which the geochemical data could be interpreted. A geochemical model of sedimentation was developed, based upon the information from the results of the statistical tests and the known geochemical associations of elements in sediments. A geochemical distinction was found between the inner and outer shelf mud belts. An age of 40 650 yr BP was previously reported for a sample on the mid-shelf in the study area, supporting the reconstruction of a paleoenvironment · showing the outer shelf mud belt to be the paleodepocentre for the Tugela River with the inner shelf mud belt representing the present-day depocentre of the Tugela River. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Geological Sciences en_ZA
dc.title The geochemistry and sedimentology of quaternary shelf sediments of the Tugela River, Natal, South Africa en_ZA
dc.type Thesis / Dissertation en_ZA
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 Masters en_ZA
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image


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