Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia

Simple item page
dc.contributor.advisorFrimmel, Hartwig Een_ZA
dc.contributor.advisorBluck, Brianen_ZA
dc.contributor.authorJacob, Janaen_ZA
dc.date.accessioned2014-10-24T07:29:08Z
dc.date.available2014-10-24T07:29:08Z
dc.date.issued2001en_ZA
dc.descriptionBibliography: leaves 117-128.en_ZA
dc.description.abstractNamibia's south western coast, the Sperrgebiet, hosts one of the world's largest diamond placer deposits. Diamond distribution in this placer deposit is directly related to the presence of a diamond-carrying gravel, the degree of reworking of the gravel and the quantity and quality of the diamond trapsites. The diamond-carrying gravel is present in the form of palaeo-beaches. Six Plio-Pleistocene beaches have been identified lying onshore between the Orange River mouth and Chameis Bay. The Plio-Pleistocene beaches are underlain by Late Proterozoic footwall. The Late-Proterozoic footwall has undergone extensive marine erosion and development of marine platforms during different sea-level stillstands. Diamond trapsites in the form of potholes and gullies are incised into palaeo platforms formed during the sea-level stillstands. The marine erosion palaeo-platforms have been cut into the predominantly siliciclastic rocks of the Gariep Belt. The Late Proterozoic Gariep Belt is divided into an eastern para- aulochthonous passive continental margin zone, the Port Nolloth Zone, and a western allochthonous Marmora Terrane. Previous work suggested that the Marmora Terrane had been thrust on top of the Port Nolloth Zone in a south-easterly direction and that the Marmora Terrane could be subdivided into three tectonostratigraphic units: the Schakalsberge Complex, the Oranjemund Complex and the Chameis Complex. In addition, previous work indicated that the Oranjemund Complex had been stacked tectonically between the Chameis Complex in the northwest and the Schakalsberge Complex in the southeast. However, this study questions the subdivision of the Marmora Terrane into three separate tectonic complexes. The rocks in the study area forms part of the newly defined Oranjemund Group, Oranjemund Sub-terrane.en_ZA
dc.identifier.apacitationJacob, J. (2001). <i>Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/8742en_ZA
dc.identifier.chicagocitationJacob, Jana. <i>"Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 2001. http://hdl.handle.net/11427/8742en_ZA
dc.identifier.citationJacob, J. 2001. Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Jacob, Jana AB - Namibia's south western coast, the Sperrgebiet, hosts one of the world's largest diamond placer deposits. Diamond distribution in this placer deposit is directly related to the presence of a diamond-carrying gravel, the degree of reworking of the gravel and the quantity and quality of the diamond trapsites. The diamond-carrying gravel is present in the form of palaeo-beaches. Six Plio-Pleistocene beaches have been identified lying onshore between the Orange River mouth and Chameis Bay. The Plio-Pleistocene beaches are underlain by Late Proterozoic footwall. The Late-Proterozoic footwall has undergone extensive marine erosion and development of marine platforms during different sea-level stillstands. Diamond trapsites in the form of potholes and gullies are incised into palaeo platforms formed during the sea-level stillstands. The marine erosion palaeo-platforms have been cut into the predominantly siliciclastic rocks of the Gariep Belt. The Late Proterozoic Gariep Belt is divided into an eastern para- aulochthonous passive continental margin zone, the Port Nolloth Zone, and a western allochthonous Marmora Terrane. Previous work suggested that the Marmora Terrane had been thrust on top of the Port Nolloth Zone in a south-easterly direction and that the Marmora Terrane could be subdivided into three tectonostratigraphic units: the Schakalsberge Complex, the Oranjemund Complex and the Chameis Complex. In addition, previous work indicated that the Oranjemund Complex had been stacked tectonically between the Chameis Complex in the northwest and the Schakalsberge Complex in the southeast. However, this study questions the subdivision of the Marmora Terrane into three separate tectonic complexes. The rocks in the study area forms part of the newly defined Oranjemund Group, Oranjemund Sub-terrane. DA - 2001 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2001 T1 - Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia TI - Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia UR - http://hdl.handle.net/11427/8742 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/8742
dc.identifier.vancouvercitationJacob J. Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 2001 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/8742en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Geological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherGeological Scienceen_ZA
dc.titleLate Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibiaen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
thesis_sci_2001_jacob_j.pdf
Size:
10.09 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Masters