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Commondale greenstone belt

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Textures and compositional profile of <span class="search-highlight">Commondale</span> <span class="search-highlight">Greenstone</span> <span class="search-highlight">Belt</span> (South Afr...
Published: 03 December 2021
Figure 1. Textures and compositional profile of Commondale Greenstone Belt (South Africa) phyric olivine crystals. (A) Typical texture of fine-grained rounded crystals contained in a high-Mg basalt matrix commonly with micro-olivine spinifex and subhedral micro-phenocrysts. Light areas
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Compositional variation of nickel in <span class="search-highlight">Commondale</span> <span class="search-highlight">Greenstone</span> <span class="search-highlight">Belt</span> (South Afri...
Published: 03 December 2021
Figure 3. Compositional variation of nickel in Commondale Greenstone Belt (South Africa) olivines compared with olivine from other plume-related occurrences. The almost constant to gradually decreasing Ni concentrations with Fo contrast with those from other mantle-related sources. Labeled curves
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Synoptic diagram summarizing the formation of <span class="search-highlight">Commondale</span> <span class="search-highlight">Greenstone</span> <span class="search-highlight">Belt</span> (S...
Published: 03 December 2021
Figure 4. Synoptic diagram summarizing the formation of Commondale Greenstone Belt (South Africa) komatiites and the history of an early Archean plume preserved in olivine viewed against the mantle phase profile adapted from Smith et al. (2018) . (A) Melting in the hydrous mantle transition zone
Journal Article
Journal: Geology
Published: 03 December 2021
Geology (2022) 50 (3): 351–355.
...Figure 1. Textures and compositional profile of Commondale Greenstone Belt (South Africa) phyric olivine crystals. (A) Typical texture of fine-grained rounded crystals contained in a high-Mg basalt matrix commonly with micro-olivine spinifex and subhedral micro-phenocrysts. Light areas...
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Geological map of the southeastern Kaapvaal craton showing distribution of ...
Published: 01 September 2012
(Commondale greenstone belt), NGB (Nondweni greenstone belt), NG (Ngwane Gneiss). Inset map shows location of the study area and the Kaapvaal craton in southern Africa.
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The simplified geological map of the southeastern Kaapvaal craton shows dis...
Published: 01 March 2021
Belt, CGB=Commondale Greenstone Belt, NGB=Nondweni Greenstone Belt, MGB=Melmoth Greenstone Belt, IGB=Ilangwe Greenstone Belt. Inset map shows location of the study area and the Kaapvaal Craton in southern Africa. Pressure-Temperature conditions after ( a ) Dziggel et al., 2002 ( b ) Moyen et al
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Compositional variation of Al 2 O 3  and Cr 2 O 3  in olivine grains from t...
Published: 03 December 2021
Figure 2. Compositional variation of Al 2 O 3 and Cr 2 O 3 in olivine grains from two samples from the Commondale Greenstone Belt (South Africa) in relation to Fo content and compared to other komatiite occurrences. (A,B) Variation of Al 2 O 3 from 0.05 wt% to 0.3 wt%. Profile types: P1—high
Journal Article
Published: 01 March 2021
South African Journal of Geology (2021) 124 (1): 17–36.
... Belt, CGB=Commondale Greenstone Belt, NGB=Nondweni Greenstone Belt, MGB=Melmoth Greenstone Belt, IGB=Ilangwe Greenstone Belt. Inset map shows location of the study area and the Kaapvaal Craton in southern Africa. Pressure-Temperature conditions after ( a ) Dziggel et al., 2002 ( b ) Moyen et al...
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Journal Article
Journal: Geosphere
Published: 07 June 2019
Geosphere (2019) 15 (4): 1008–1037.
..., 2008 ). Other komatiites with long-recognized boninitic affinities are the depleted, Commondale type found within the ca. 3.3 Ga Commondale greenstone belt (e.g., Wilson, 2002 , 2003 ) and the Weltevreden Formation of the Barberton greenstone belt (e.g., Stiegler et al., 2012 ; see also Figs...
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Journal Article
Published: 01 September 2016
South African Journal of Geology (2016) 119 (3): 519–534.
... conditions. The CaO contents (average ca. 5.5 wt%) of the bulk rock ( Mouri et al., 2013 ) are slightly lower, while the Na 2 O contents (average: 0.65 wt%) are slightly higher, than that of the average compositions of Al-undepleted komatiite from the Abitibi greenstone belt in Canada (CaO: 6.25 wt%; Na 2 O...
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Journal Article
Published: 01 September 2012
South African Journal of Geology (2012) 115 (3): 259–282.
... (Commondale greenstone belt), NGB (Nondweni greenstone belt), NG (Ngwane Gneiss). Inset map shows location of the study area and the Kaapvaal craton in southern Africa. ...
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Journal Article
Published: 01 September 2020
South African Journal of Geology (2020) 123 (3): 263–276.
... described south of Barberton. The larger ones include the Dwalile, Assegaai, Commondale, Nondweni and Ilangwe greenstone belts/remnants that are tectonically interleaved with tonalite-trondhjemite-granodiorite (TTG) gneisses and intruded by a large variety of granitoids ( Figure 1 ; Hunter and Wilson, 1988...
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Journal Article
Published: 01 June 2013
South African Journal of Geology (2013) 116 (1): 55–66.
... (e.g. Nesbitt et al., 1977 ). (iii) Relatively Ti-depleted and silica-enriched komatiites, e.g., in the Commondale greenstone fragment, South Africa ( Wilson, 2003 ) and (iv) Ti-and Fe-rich komatiites, e.g., from the Karasjok and Lapland Greenstone Belts, northern Norway and Finland, respectively...
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Journal Article
Published: 01 June 2004
South African Journal of Geology (2004) 107 (1-2): 107–118.
... residues must have been produced by melts even more mafic than the Kk, and may be represented by the extremely mafic ~3.3 Ga Commondale komatiites that outcrop south of the Barberton greenstone belt ( Wilson et al. , 2003 ). Figure 3. Mg# of olivine in the Kaapvaal mantle versus the Mg...
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Journal Article
Published: 01 June 2022
South African Journal of Geology (2022) 125 (2): 133–166.
...M.M. Tau; R. Bolhar; A.H. Wilson; C.R. Anhaeusser Abstract Ultramafic-mafic layered complexes are important but not-well studied components of Archaean granitoid-greenstone terranes. In the vicinity of the Barberton Greenstone Belt (BGB), at least 27 such complexes are intimately associated...
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Journal Article
Published: 01 September 2022
Russ. Geol. Geophys. (2022) 63 (9): 981–1000.
...) in the Central Lapland Greenstone Belt of Finland and northern Norway ( Hanski et al., 2001 ). However, these complexes underwent much greater extents of regional metamorphic transformations, and the Vetreny Poyas komatiites thus provide more important petrogenetic information. The overall variations...
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Journal Article
Published: 02 June 2010
Canadian Journal of Earth Sciences (2010) 47 (5): 565–589.
... with greenstone belts preserved in other cratons. Conversely, it presents an ideal area in which to establish the relative importance of mantle plume and plate tectonic geodynamic processes during a period of rapid crustal growth. Fig. 1. Simplified map of the Superior Province craton showing the location...
Journal Article
Published: 01 June 2013
South African Journal of Geology (2013) 116 (1): 119–168.
... of 3147 ± 13 Ma. There are also fragments of older greenstones on the west side of the Pongola depository in the north and central regions (Commondale greenstone belt at 3316 ± 16 Ma ( Wilson and Carlson, 1989 ) and Nondweni at c. 3.53 to c. 3.42 Ga ( Xie et al., 2012 )). The post-Pongola granitoids...
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Journal Article
Journal: Economic Geology
Published: 01 May 2010
Economic Geology (2010) 105 (3): 669–688.
... concluded, on the basis of Δ 33 S data, that komatiite-related Ni sulfide deposits of the Agnew Wiluna greenstone belt in Western Australia and deposits in the Alexo-Dundonald area of Ontario show mass-independent fractionation requiring “almost all of the sulfur in these deposits to have come from...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP389.12
EISBN: 9781862396654
... not be exclusively derived from subduction-related processes ( Bédard et al. 2013 ; Barnes & Van Kranendonk 2014 ). Recently, the oldest felsic volcanic rocks of the Barberton Greenstone Belt have been shown to be derived from melting of older continental crust ( Van Kranendonk et al. 2009 ; Kröner et al...
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