Zobrazeno 1 - 10 of 24 pro vyhledávání: '"H.S. van Niekerk"'
1
Provenance of metasedimentary rocks of the Kheis Terrane and Kakamas Domain: support for accretionary tectonics during the development of the western Namaqua-Natal metamorphic province
Autor: H.S. van Niekerk, M.A. Elburg, T. Andersen, R.A. Armstrong
Publikováno v: South African Journal of Geology. 125:61-78
The ~1 200 to 1 000 Ma Namaqua-Natal Metamorphic Province (NNMP) is part of a major orogenic belt in the west-central parts of South Africa and most likely formed during the convergence of the Laurentia and Kalahari cratons during the assembly of Rod
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2fd4885ae814fcc97395fb0a420b442b
https://doi.org/10.25131/sajg.125.0003
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2
The Grenvillian assembly of Rodinia: Timing of accretion on the western margin of the Kalahari (Kaapvaal) Craton
Autor: Paulo M. Vasconcelos, H.S. Van Niekerk, Richard Armstrong
Publikováno v: South African Journal of Geology. 123:441-464
During the Grenvillian assembly of Rodinia, the Namaqua-Natal Metamorphic Province (NNMP) was formed as a result of the convergence of the Laurentia and Kalahari cratons. A detailed model for this accretion along the south-eastern margin of the Kalah
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::00118223ee2ab310821844e6d431a6a1
https://doi.org/10.25131/sajg.123.0042
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3
Revised definition/outline of the Kheis Terrane along the western margin of the Kaapvaal Craton and lithostratigraphy of the newly proposed Keis Supergroup
Autor: N.J. Beukes, H.S. Van Niekerk
Publikováno v: South African Journal of Geology. 122:187-220
The Kheis Province is situated between the Namaqua-Natal Province and the western margin of the Kaapvaal Craton in the Northern Cape Province of South Africa. It has been described as a thin-skinned fold and thrust belt formed between 1800 and 1700 M
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f446611905ff4cd460a04f4728baecfe
https://doi.org/10.25131/sajg.122.0014
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5
Transvaal Supergroup carbonates: Implications for Paleoproterozoic δ18O and δ13C records
Autor: Frank Frauenstein, Louis Coetzee, Ján Veizer, N.J. Beukes, H.S. Van Niekerk
Publikováno v: Precambrian Research. 175:149-160
The Paleoproterozoic interval is characterized by the first evidence for incontrovertibly free oxygen in the ocean/atmosphere system. In this study, carbonates from the Transvaal Group, the Silverton, Lucknow, Rooinekke and particularly the Duitschla
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb2b1640a2bfa7f65a868647bd3c811e
https://doi.org/10.1016/j.precamres.2009.09.005
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6
Rise in seawater sulphate concentration associated with the Paleoproterozoic positive carbon isotope excursion: evidence from sulphate evaporites in the ∼2.2–2.1 Gyr shallow-marine Lucknow Formation, South Africa
Autor: Andrey Bekker, S. Schröder, H.S. Van Niekerk, N.J. Beukes, Harald Strauss
Publikováno v: Terra Nova. 20:108-117
Past oceanic sulphate concentration is important for under- standing how the oceansredox state responded to atmospheric oxygen levels. The absence of extensive marine sulphate evaporites before 1.2 Gyr probably reflects low seawater sulphate and ⁄
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::79f5dc60ef7f391f4e28332a77e27233
https://doi.org/10.1111/j.1365-3121.2008.00795.x
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7
Revised geochronology of magmatism in the western Capricorn Orogen at 1805-1785 Ma: diachroneity of the Pilbara-Yilgarn collision
Autor: Keith Sircombe, H.S. Van Niekerk, M. G. Doyle, David Evans, Robert T. Pidgeon, M. Mccarthy, Michael T.D. Wingate
Publikováno v: Australian Journal of Earth Sciences. 50:853-864
The June Hill Volcanics occupy a central stratigraphic position in the tectonic evolution of the Capricorn Orogeny that occurred along the southwestern margin of the Pilbara Craton in Palaeoproterozoic time. The volcanic rocks have been interpreted a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fbe4974f96ac4d6fa0ecb7431130cc01
https://doi.org/10.1111/j.1400-0952.2003.01031.x
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8
Supergene Ferromanganese Wad Deposits Derived from Permian Karoo Strata along the Late Cretaceous-Mid-Tertiary African Land Surface, Ryedale, South Africa
Autor: Stephan Hoernes, Jens Gutzmer, Andreas Pack, H.S. Van Niekerk, Nicolas J. Beukes
Publikováno v: Economic Geology. 95:203-220
A previously unknown type of ferromanganese wad deposit is described at the Ryedale mine situated 110 km west of Johannesburg in the northwestern province of South Africa. The wad was derived from supergene alteration of Glossopteris -bearing Permian
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8d6f952ff98a91ae01aaca79871f3208
https://doi.org/10.2113/gsecongeo.95.1.203
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9
Post-Gondwana pedogenic ferromanganese deposits, ancient soil profiles, African land surfaces and palaeoclimatic change on the Highveld of South Africa
Autor: H.S. Van Niekerk, Jens Gutzmer, Nicolas J. Beukes
Publikováno v: Journal of African Earth Sciences. 29:761-781
Several ferromanganese wad deposits are developed on the Archaean Malmani dolomite succession of the Transvaal Supergroup along the plateau forming the watershed between rivers draining to the Indian and Atlantic Oceans from the Highveld area between
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3509df473ae3fb680a86c90e189cc67d
https://doi.org/10.1016/s0899-5362(99)00128-1
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10
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