J
Jan Kramers
Researcher at University of Johannesburg
Publications - 181
Citations - 22087
Jan Kramers is an academic researcher from University of Johannesburg. The author has contributed to research in topics: Metamorphism & Craton. The author has an hindex of 56, co-authored 175 publications receiving 20428 citations. Previous affiliations of Jan Kramers include University of Liverpool & Leipzig University.
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Journal ArticleDOI
234U/238U activity ratio disequilibrium technique for studying uranium mobility in the Opalinus Clay at Mont Terri, Switzerland.
TL;DR: Mobility of naturally occurring 238U and 234U radionuclides was studied in a low permeability, reducing claystone formation near its contact with an overlying oxidising aquifer at Mont Terri, Switzerland to point to a limited redistribution of U in some of the studied samples.
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South African speleothems reveal influence of high- and low-latitude forcing over the past 113.5 k.y.
Brian M. Chase,Brian M. Chase,Chris Harris,Maarten J. de Wit,Jan Kramers,Sean Doel,J. Stankiewicz +6 more
TL;DR: In this article, a speleothem from the Cango Caves in southernmost South Africa enables the construction of coherent regional composite records spanning the past 113,500 yr.
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Hydrothermal clay mineral formation in the uraniferous Paleoproterozoic FA Formation, Francevillian basin, Gabon
Frantz Ossa Ossa,Axel Hofmann,Olivier Vidal,Jan Kramers,Andrea Agangi,G.A. Belyanin,Francis Mayaga-Mikolo +6 more
TL;DR: In this paper, the spatial distribution of neoformed clay minerals was investigated in the Paleoproterozoic FA Formation of the Francevillian basin, south-east Gabon, which hosts high-grade U ore deposits associated with the only known occurrence of natural nuclear reactors.
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Development of cosmogenic nuclide capabilities in South Africa and applications in Southern African geomorphology
Tebogo V. Makhubela,Stephan R. Winkler,Vela Mbele,Jan Kramers,Rivoningo R. Khosa,Hendric P. Moabi,Sibusiso M. Konyana +6 more
TL;DR: Cosmogenic nuclide (CN) applications offer methods to quantify rates of landscape change and of dating geomorphological deposits and surfaces as discussed by the authors, and over the past two decades, CNs have been used to deter...
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Transport of 234U in the Opalinus Clay on centimetre to decimetre scales
TL;DR: In this paper, the in situ, long-term migration behavior of 234U in the Opalinus Clay was studied using MC-ICP-MS and the authors concluded that the small-scale lithological variations which govern U spatial distribution in the opalinus clay are the major factor determining 234U's in situ supply rates, regulating its diffusive fluxes and controlling the observed bulk rock 234U/238U activity ratios.