O- And H-Isotope Study of the Carbon Leader Reef at the Tau Tona and Savuka Mines (Western Deep Levels) South Africa: Implications for the origin and evolution of Witwatersrand Basin Fluids

 

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dc.contributor.author Grové, D
dc.contributor.author Harris, Christopher
dc.date.accessioned 2018-06-07T09:09:01Z
dc.date.available 2018-06-07T09:09:01Z
dc.date.issued 2010
dc.identifier.citation Grové, D., & Harris, C. (2010). O-and H-isotope study of the Carbon Leader Reef at the Tau Tona and Savuka mines (Western Deep Levels), South Africa: implications for the origin and evolution of Witwatersrand basin fluids. South African Journal of Geology, 113(1), 73-86.
dc.identifier.uri http://hdl.handle.net/11427/28245
dc.description.abstract The Carbon Leader Reef is a ~1 m thick conglomeratic unit with a thin bituminous base, and is one of the major gold-bearing conglomerate horizons in the Central Rand Group of the Witwatersrand Basin. It consists of alternating conglomerate and quartzite layers and was metamorphosed under greenschist facies conditions. Bulk rock δ18O and δD values of the Carbon Leader Reef range from 7.2‰ to 10.8‰ (mean = 10.6‰) and −27 to −65 (mean = −41‰), respectively. The narrow range in δ18O values, together with the lack of correlation between the δ18O value and the modal % matrix minerals, suggests that the original detrital minerals and the authigenic matrix minerals have similar oxygen isotope composition. Calculated δD values of the fluid, assuming that it was in isotope equilibrium with the bulk rock at the estimated peak metamorphic temperature of 350°C, range from −1‰ to −40‰. This suggests that the ultimate origin of the fluid was a mixture of meteoric and metamorphic water. These data are not consistent with the ingress of large quantities of externally derived fluid post burial metamorphism. Gold-rich sections of the Carbon Leader Reef do not have significantly different δ18O values than the adjacent gold-poor section, which suggests that gold mineralization is not related to interaction with significant amounts of externally derived hydrothermal fluids.
dc.language.iso eng
dc.source South African Journal of Geology
dc.source.uri http://sajg.geoscienceworld.org/content/113/1/73.short
dc.title O- And H-Isotope Study of the Carbon Leader Reef at the Tau Tona and Savuka Mines (Western Deep Levels) South Africa: Implications for the origin and evolution of Witwatersrand Basin Fluids
dc.type Journal Article
dc.date.updated 2016-01-14T07:30:45Z
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Geological Sciences en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Grové, D., & Harris, C. (2010). O- And H-Isotope Study of the Carbon Leader Reef at the Tau Tona and Savuka Mines (Western Deep Levels) South Africa: Implications for the origin and evolution of Witwatersrand Basin Fluids. <i>South African Journal of Geology</i>, http://hdl.handle.net/11427/28245 en_ZA
dc.identifier.chicagocitation Grové, D, and Christopher Harris "O- And H-Isotope Study of the Carbon Leader Reef at the Tau Tona and Savuka Mines (Western Deep Levels) South Africa: Implications for the origin and evolution of Witwatersrand Basin Fluids." <i>South African Journal of Geology</i> (2010) http://hdl.handle.net/11427/28245 en_ZA
dc.identifier.vancouvercitation Grové D, Harris C. O- And H-Isotope Study of the Carbon Leader Reef at the Tau Tona and Savuka Mines (Western Deep Levels) South Africa: Implications for the origin and evolution of Witwatersrand Basin Fluids. South African Journal of Geology. 2010; http://hdl.handle.net/11427/28245. en_ZA
dc.identifier.ris TY - AU - Grové, D AU - Harris, Christopher AB - The Carbon Leader Reef is a ~1 m thick conglomeratic unit with a thin bituminous base, and is one of the major gold-bearing conglomerate horizons in the Central Rand Group of the Witwatersrand Basin. It consists of alternating conglomerate and quartzite layers and was metamorphosed under greenschist facies conditions. Bulk rock δ18O and δD values of the Carbon Leader Reef range from 7.2‰ to 10.8‰ (mean = 10.6‰) and −27 to −65 (mean = −41‰), respectively. The narrow range in δ18O values, together with the lack of correlation between the δ18O value and the modal % matrix minerals, suggests that the original detrital minerals and the authigenic matrix minerals have similar oxygen isotope composition. Calculated δD values of the fluid, assuming that it was in isotope equilibrium with the bulk rock at the estimated peak metamorphic temperature of 350°C, range from −1‰ to −40‰. This suggests that the ultimate origin of the fluid was a mixture of meteoric and metamorphic water. These data are not consistent with the ingress of large quantities of externally derived fluid post burial metamorphism. Gold-rich sections of the Carbon Leader Reef do not have significantly different δ18O values than the adjacent gold-poor section, which suggests that gold mineralization is not related to interaction with significant amounts of externally derived hydrothermal fluids. DA - 2010 DB - OpenUCT DP - University of Cape Town J1 - South African Journal of Geology LK - https://open.uct.ac.za PB - University of Cape Town PY - 2010 T1 - O- And H-Isotope Study of the Carbon Leader Reef at the Tau Tona and Savuka Mines (Western Deep Levels) South Africa: Implications for the origin and evolution of Witwatersrand Basin Fluids TI - O- And H-Isotope Study of the Carbon Leader Reef at the Tau Tona and Savuka Mines (Western Deep Levels) South Africa: Implications for the origin and evolution of Witwatersrand Basin Fluids UR - http://hdl.handle.net/11427/28245 ER - en_ZA


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