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Twakputs Gneiss

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Journal Article
Published: 01 September 2021
South African Journal of Geology (2021) 124 (3): 783–794.
...S. Doggart; P.H. Macey; D. Frei Abstract The Twakputs Gneiss is a garnetiferous, K-feldspar megacrystic, biotite granite-granodiorite orthogneiss. It represents a major unit in the Kakamas Domain of the Mesoproterozoic Namaqua-Natal Metamorphic Province extending about 250 km between Riemvasmaak...
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( a ) Irregular dykes of Witwater <span class="search-highlight">Gneiss</span> (Ww) intruding the <span class="search-highlight">Twakputs</span> <span class="search-highlight">Gneiss</span>...
Published: 01 September 2021
Figure 6. ( a ) Irregular dykes of Witwater Gneiss (Ww) intruding the Twakputs Gneiss (Tw). ( b ) Foliation in the Twakputs Gneiss cross cut by younger dyke of Witwater Gneiss.
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( a ) and ( b ) typical examples of the <span class="search-highlight">Twakputs</span> <span class="search-highlight">Gneiss</span> showing the stretch...
Published: 01 September 2021
Figure 4. ( a ) and ( b ) typical examples of the Twakputs Gneiss showing the stretched out ovoid feldspar megacrysts that define the strong penetrative ductile gneissic foliation ( c ) a close-up of the Twakputs Gneiss showing the disseminated garnet (Grt) grains found in association
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Distribution of the <span class="search-highlight">Twakputs</span> <span class="search-highlight">Gneiss</span>. Compiled from geological maps by  Moen...
Published: 01 September 2021
Figure 1. Distribution of the Twakputs Gneiss. Compiled from geological maps by Moen (2007) , Moen and Toogood (2007) and Macey et al. (2015) .
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The geochemical classification of the <span class="search-highlight">Twakputs</span> <span class="search-highlight">Gneiss</span> (red dots) and the Ee...
Published: 01 September 2021
Figure 7. The geochemical classification of the Twakputs Gneiss (red dots) and the Eendoorn Suite (black dots). Data after Beukes (1973) , Du Plessis (1979 , 1986 ) and Macey et al. (2015) . (a) Total alkali versus silica plot ( Cox et al., 1979 ), (b) QAP mesonormative mineralogy
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Harker bivariate major element diagram of the <span class="search-highlight">Twakputs</span> <span class="search-highlight">Gneiss</span> (red dots) an...
Published: 01 September 2021
Figure 8. Harker bivariate major element diagram of the Twakputs Gneiss (red dots) and the Eendoorn Suite (black dots).
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The foliation of the <span class="search-highlight">Twakputs</span> <span class="search-highlight">Gneiss</span> (Tw) is cross-cut by the Donkieboud Gr...
Published: 01 September 2020
Figure 6. The foliation of the Twakputs Gneiss (Tw) is cross-cut by the Donkieboud Granodiorite (Db; 28°22’50.01”S; 19°55’25.98”E).
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( a ) and ( b ) Typical pavement and boulder tor outcrop of the <span class="search-highlight">Twakputs</span> Gr...
Published: 01 September 2021
Figure 5. ( a ) and ( b ) Typical pavement and boulder tor outcrop of the Twakputs Granite Gneiss. In photograph (a) notice the difference in colour between the resistant white ridges of Witwater Gneiss (Ww) in the background and the brown weathering Twakputs Gneiss (Tw, middle ground). ( c
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( a ) MORB-normalised (Sun and McDonough, 1989) trace element spider diagra...
Published: 01 September 2021
Figure 9. ( a ) MORB-normalised (Sun and McDonough, 1989) trace element spider diagrams for the Eendoorn Suite (grey polygon) and Twakputs Gneiss (red dots) and ( b ) Chondrite-normalised (Nakamura, 1979) rare earth element patterns of the Eendoorn Suite and Twakputs Gneiss.
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Simplified map showing the geology of the western type area of the <span class="search-highlight">Twakputs</span>...
Published: 01 September 2021
Figure 2. Simplified map showing the geology of the western type area of the Twakputs Gneiss (locality B). Map and age data compiled from Moen (2007) , Moen and Toogood (2007) , Pettersson (2008) , Bial et al. (2015) , Colliston et al. (2015), Macey et al. (2015 , 2018 ), Bailie et al
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(a) Panoramic view, facing east, of the Stolzenfels Enderbite outcropping o...
Published: 01 June 2018
°30′45.00″S, 19°49′59.88″E), (c) a sharp contact between the Stolzenfels Enderbite (left) and the Twakputs Gneiss (right) at the western margin of the pluton (28°30′28.08″S, 19°49′9.48″E), (d) highly deformed and sheared contact between the Stolzenfels Enderbite (left) and the Donkieboud Granodiorite
Journal Article
Published: 01 September 2020
South African Journal of Geology (2020) 123 (3): 421–430.
...Figure 6. The foliation of the Twakputs Gneiss (Tw) is cross-cut by the Donkieboud Granodiorite (Db; 28°22’50.01”S; 19°55’25.98”E). ...
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Journal Article
Published: 01 June 2018
South African Journal of Geology (2018) 121 (2): 217–226.
...°30′45.00″S, 19°49′59.88″E), (c) a sharp contact between the Stolzenfels Enderbite (left) and the Twakputs Gneiss (right) at the western margin of the pluton (28°30′28.08″S, 19°49′9.48″E), (d) highly deformed and sheared contact between the Stolzenfels Enderbite (left) and the Donkieboud Granodiorite...
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Wetherill concordia diagrams showing LA-ICPMS zircon U-Pb data for two samp...
Published: 01 September 2021
Figure 3 Wetherill concordia diagrams showing LA-ICPMS zircon U-Pb data for two samples of Twakputs Granite Gneiss.
Journal Article
Published: 01 September 2020
South African Journal of Geology (2020) 123 (3): 431–440.
... ). The pre- to syn-tectonic batholith is situated in the central parts of the Kakamas Domain in the Namaqua Sector of the Namaqua-Natal Metamorphic Province (NNMP) where they intrude garnetiferous megacrystic granite gneiss (Twakputs Gneiss, 1 210 to 1 195 Ma; Macey et al., 2015 ) and metapelites (Narries...
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Journal Article
Published: 01 September 2021
South African Journal of Geology (2021) 124 (3): 795–804.
... leucogranite gneiss, Narries metapelite and Twakputs garnet-augen gneiss) ranging in width from 10 to 250 m. Xenoliths of leucogranite gneiss (Gemsbokvlakte Gneiss) were also observed on Styr-Kraal 81 near the southern margin of the batholith where the rafts reach up to 100 m in size. The Naros...
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Journal Article
Published: 01 December 2018
South African Journal of Geology (2018) 121 (4): 431–450.
... grey gneiss Bakrivier and Kouroprivier granite Wolfkop biotite gneiss Grey gneissic-granite Eendoorn granite Eendoorn Suite (Twakputs and Donkieboud granites) Witwater gneiss Leucocratic garnet gneiss (foliated, fine to medium grained to pegmatitic) Grey gneiss - Wolfkop biotite gneiss...
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