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Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield
Bibliography: pages 157-167.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Geological Sciences
2016
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| _version_ | 1867613215141134336 |
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| access_status_str | Open Access |
| author | Gartz, Volker Heinrich |
| author2 | Frimmel, Hartwig |
| author_browse | Frimmel, Hartwig Gartz, Volker Heinrich |
| author_facet | Frimmel, Hartwig Gartz, Volker Heinrich |
| author_sort | Gartz, Volker Heinrich |
| collection | Thesis |
| description | Bibliography: pages 157-167. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/21406 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:36.207Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Geological Sciences |
| publisherStr | Department of Geological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/21406 Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield Gartz, Volker Heinrich Frimmel, Hartwig Geological Science Bibliography: pages 157-167. 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. 2016-08-22T12:21:28Z 2016-08-22T12:21:28Z 1996 Master Thesis Masters MSc http://hdl.handle.net/11427/21406 eng application/pdf Department of Geological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Geological Science Gartz, Volker Heinrich Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield |
| thesis_degree_str | Master's |
| title | Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield |
| title_full | Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield |
| title_fullStr | Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield |
| title_full_unstemmed | Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield |
| title_short | Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield |
| title_sort | post depositional alteration of the ventersdorp contact reef at vaal reef no 10 shaft klerksdorp goldfield |
| topic | Geological Science |
| url | http://hdl.handle.net/11427/21406 |
| work_keys_str_mv | AT gartzvolkerheinrich postdepositionalalterationoftheventersdorpcontactreefatvaalreefno10shaftklerksdorpgoldfield |