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.
Papers
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Journal ArticleDOI
The age of fossil StW573 (‘Little Foot’): Reply to comments by Stratford et al. (2017)
Jan Kramers,Paul H.G.M. Dirks +1 more
TL;DR: In this article, an alternative interpretation of 26Al/10Be burial data is presented, in which they revisit the burial age reported by Granger et al. for the sediments encasing the fossil and the data on which this was based.
Journal ArticleDOI
Proterozoic 40Ar/39Ar ages from cave deposits of the Malapa, Sterkfontein and Dinaledi fossil sites, Cradle of Humankind, South Africa.
TL;DR: In this paper, the use of 40 Ar/39 Ar dating on ooids and indurated, extremely fine-grained mudstone occurring in cave sediments in the Cradle of Humankind (CoH) UNESCO world heritage site was explored.
Book ChapterDOI
A review of Sm-Nd and Lu-Hf isotope studies in the Limpopo Complex and adjoining cratonic areas, and their bearing on models of crustal evolution and tectonism
Jan Kramers,Armin Zeh +1 more
Journal ArticleDOI
Cause and timing of the thermal over-maturation of hydrocarbon source rocks of the Ecca Group (Main Karoo Basin, South Africa)
Elijah O. Adeniyi,Frantz Ossa Ossa,Jan Kramers,Michiel O. de Kock,G.A. Belyanin,Nicolas J. Beukes +5 more
TL;DR: In this paper, the authors carried out 40Ar/39Ar radiometric dating of illite and showed that illite fractions from samples close to dolerite intrusions showed formation age between 204 and 170 Ma, consistent with the time of the KLIP sills and dykes intrusions at ∼180 Ma.
Journal ArticleDOI
Petrography of the carbonaceous, diamond-bearing stone “Hypatia” from southwest Egypt: A contribution to the debate on its origin
G.A. Belyanin,Jan Kramers,Marco A.G. Andreoli,Francesco Greco,Francesco Greco,Arnold Gucsik,Arnold Gucsik,Arnold Gucsik,Tebogo V. Makhubela,Wojciech J. Przybyłowicz,Wojciech J. Przybyłowicz,Michael Wiedenbeck +11 more
TL;DR: In this paper, a reconnaissance study of the carbonaceous matrix of the Hypatia stone and the phases enclosed in it was conducted, and the results showed that carbonaceous matrices of two types occur irregularly intermingled on the 50-500-μm scale: Matrix-1, consisting of almost pure carbonaceous matter, and Matrix-2, containing Fe, Ni, P and S at abundances analyzable by microprobe.