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- W2051969969 abstract "Abstract Four uraninite separates from different reefs from in and above the Central Rand Group (Upper Witwatersrand Supergroup) were obtained from gold mines in the East Rand, West Rand, and Welkom Goldfields of the Witwatersrand Basin in South Africa. These samples were dated by the Xes-Xen spectrum technique. All four age spectra have a typical stepup form with plateaux for high temperature Xe release. The plateau ages are 0.832 ± 0.026 Ga for the Carbon Leader Reef sample from Blyvooruitzicht Gold Mine, 1.043 ± 0.024 Ga for the Basal Reef sample from Free State Geduld Gold Mine, 1.115 ± 0.036 Ga for the Main Reef uraninite concentrate from Sub Nigel Gold Mine, and 1.300 ± 0.058 Ga for the Ventersdorp Contact Reef sample from Kloof Gold Mine. No apparent ages in excess of 1600 Ma were observed. It is obvious from the general Witwatersrand chronological database that these fission xenon dating results do not correspond to primary crystallization ages for the uraninites. Instead, they most likely represent resetting events that affected the UXe isotopic system in these samples. Comparison with other recent chronological results obtained on rocks from the region of and around the Witwatersrand Basin indicates that the region was affected by magmatotectonic activity at 1.3 to 1 Ga ago, which, thus, was not only localized along the southern margin of the Kaapvaal Craton, the so-called Namaqua-Natal Thrust Front, but also affected other parts of the craton." @default.
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- W2051969969 date "1995-12-01" @default.
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- W2051969969 title "Fission xenon dating of Witwatersrand uraninites: Implications for geological activity in the Central Kaapvaal Craton about 1 Ga ago" @default.
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- W2051969969 doi "https://doi.org/10.1016/0016-7037(95)00354-1" @default.
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