Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield

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dc.contributor.advisorFrimmel, Hartwigen_ZA
dc.contributor.authorGartz, Volker Heinrichen_ZA
dc.date.accessioned2016-08-22T12:21:28Z
dc.date.available2016-08-22T12:21:28Z
dc.date.issued1996en_ZA
dc.descriptionBibliography: pages 157-167.en_ZA
dc.description.abstractThe Ventersdorp Contact Reef (VCR) is an auriferous conglomerate which unconformably overlies the rocks of the Witwatersrand Supergroup. It acted as a palaeo-aquifer and is capped by relatively impermeable metabasalts of the Ventersdorp Supergroup. Three post-depositional alteration events, which form an alteration halo in the footwall and hangjngwall rocks around the VCR, can be recognised. The first of these alteration events is attributed to regional metamorphism and is identified by the formation of pyrophyllite in the footwall quartzites and a lower green schist facies mineral assemblage in the hangingwall metabasalts. The second and third alteration events are interpreted as metasomatic fluid in filtration events which were focused along the VCR horizon. The second alteration event involved K⁺metasomatism which affected the footwall and hanging wall rocks up to a distance of several metres away from the VCR The third alteration event, during which the muscovite was partially replaced, was associated with the formation of chlorite in and immediately around the VCR-Chlorite thermometry suggests a temperature of 307 ± 14°C for this event. The close mineralogical association of gold with chlorite, secondary pyrite and secondary quartz in the VCR is interpreted to indicate that gold remobilisation was associated with the chlorite forming alteration event. The inhomogeneity found in gold particles within a hydrothermal quartz vein indicates a sharp drop in temperature after gold precipitation, suggesting a very short period of hydrothermal fluid infiltration.en_ZA
dc.identifier.apacitationGartz, V. H. (1996). <i>Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/21406en_ZA
dc.identifier.chicagocitationGartz, Volker Heinrich. <i>"Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1996. http://hdl.handle.net/11427/21406en_ZA
dc.identifier.citationGartz, V. 1996. Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Gartz, Volker Heinrich AB - The Ventersdorp Contact Reef (VCR) is an auriferous conglomerate which unconformably overlies the rocks of the Witwatersrand Supergroup. It acted as a palaeo-aquifer and is capped by relatively impermeable metabasalts of the Ventersdorp Supergroup. Three post-depositional alteration events, which form an alteration halo in the footwall and hangjngwall rocks around the VCR, can be recognised. The first of these alteration events is attributed to regional metamorphism and is identified by the formation of pyrophyllite in the footwall quartzites and a lower green schist facies mineral assemblage in the hangingwall metabasalts. The second and third alteration events are interpreted as metasomatic fluid in filtration events which were focused along the VCR horizon. The second alteration event involved K⁺metasomatism which affected the footwall and hanging wall rocks up to a distance of several metres away from the VCR The third alteration event, during which the muscovite was partially replaced, was associated with the formation of chlorite in and immediately around the VCR-Chlorite thermometry suggests a temperature of 307 ± 14°C for this event. The close mineralogical association of gold with chlorite, secondary pyrite and secondary quartz in the VCR is interpreted to indicate that gold remobilisation was associated with the chlorite forming alteration event. The inhomogeneity found in gold particles within a hydrothermal quartz vein indicates a sharp drop in temperature after gold precipitation, suggesting a very short period of hydrothermal fluid infiltration. DA - 1996 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1996 T1 - Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield TI - Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield UR - http://hdl.handle.net/11427/21406 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21406
dc.identifier.vancouvercitationGartz VH. Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1996 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21406en_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.titlePost-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfielden_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
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