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Ongeluk Formation

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Journal Article
Journal: Geology
Published: 02 October 2019
Geology (2019) 47 (12): 1131–1135.
...Birger Rasmussen; Jian-Wei Zi; Janet R. Muhling Abstract There is geological evidence for widespread deformation in the Kaapvaal craton, South Africa, between 2.2 and 2.0 Ga. In Griqualand West, post-Ongeluk Formation (ca. 2.42 Ga) and pre-Mapedi Formation (>1.91 Ga) folding, faulting...
FIGURES | View All (4)
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Hand specimen photographs of polished drill core pieces of selected litholo...
Published: 01 June 2006
with abundant diagenetic ovoids of kutnahorite (REX44-26); ( D ) Hematite lutite with thickly banded, poddy appearance (REX44-17); ( E ) Microbanded, hematite-rich oxide facies iron formation immediately above the contact to the Ongeluk Formation (REX44-33).
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Stratigraphic column for the Voëlwater Subgroup as intersected in drill co...
Published: 01 June 2006
Figure 2. Stratigraphic column for the Voëlwater Subgroup as intersected in drill core REX44. Sample positions and numbers are indicated. Note that samples REX44-34 and REX44-36 are hyaloclastite and massive lava, respectively, of the topmost section of the Ongeluk Formation. No detailed
Image
(A)  Rare Earth Element (REE) diagrams normalised to primitive mantle after...
Published: 01 March 2023
., 2004b ), the Bushveld Complex and related intrusions ( Barnes et al., 2010 ) and the Ongeluk Formation (Humbert et al., 2018). (C) and (D) Multi-element diagrams normalised to primitive mantle after McDonough and Sun ( 1995 ) for the Puduhush gabbro samples (solid black lines), compared to the above
Image
Distribution of the outcrops of the Transvaal Supergroup with the Hekpoort ...
Published: 01 December 2020
Granophyre and Lebowa Granite suites. The location of the Griqualand West sub-basin (GWB) and the Ongeluk Formation (2426Ma; Gumsley et al., 2017 ) within the Kaapvaal Craton is shown in the inset. The red rectangles along the Hekpoort outcrops represent areas corresponding to the stratigraphic columns
Journal Article
Published: 01 June 2006
South African Journal of Geology (2006) 109 (1-2): 63–80.
... with abundant diagenetic ovoids of kutnahorite (REX44-26); ( D ) Hematite lutite with thickly banded, poddy appearance (REX44-17); ( E ) Microbanded, hematite-rich oxide facies iron formation immediately above the contact to the Ongeluk Formation (REX44-33). ...
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Journal Article
Published: 01 June 2002
South African Journal of Geology (2002) 105 (2): 107–134.
... to the east. The volcano-sedimentary sequence of the Postmasburg Group is stratigraphically divided into the Makganyene Formation (diamictite) and Ongeluk Formation (basalt) and Voëlwater Subgroup. The Makganyene, below the Ongeluk Formation, is not identifiable on the seismic section. This may be partly...
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Journal Article
Published: 01 March 2019
South African Journal of Geology (2019) 122 (1): 39–56.
... known as the Hekpoort Formation in the Pretoria Group, and the Ongeluk Formation in the Postmasburg Group ( Beukes et al., 2002 ; Eriksson et al., 2006 ). The correlation was supported by a ca . 2.22 Ga Pb-Pb thermal ionization mass spectrometer (TIMS) whole-rock isochron date on the Ongeluk Formation...
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Journal Article
Published: 01 December 2020
South African Journal of Geology (2020) 123 (4): 655–668.
... Granophyre and Lebowa Granite suites. The location of the Griqualand West sub-basin (GWB) and the Ongeluk Formation (2426Ma; Gumsley et al., 2017 ) within the Kaapvaal Craton is shown in the inset. The red rectangles along the Hekpoort outcrops represent areas corresponding to the stratigraphic columns...
FIGURES | View All (8)
Journal Article
Published: 01 December 2014
South African Journal of Geology (2014) 117 (2): 173–192.
... of the Ongeluk Formation ( Figure 2 ) with pillows and hyaloclastites indicating extrusion in predominantly subaqueous environments ( Grobler and Botha, 1976 ; Gutzmer et al., 2001 ; 2003 ). The Ongeluk Formation and its lateral correlative, the terrestrial Hekpoort Formation in the Transvaal region...
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Journal Article
Journal: Geology
Published: 28 October 2019
Geology (2020) 48 (1): 44–48.
... fault with an estimated 35–125 km eastward horizontal displacement ( Beukes and Smit, 1987 ), is older than 1915.6 ± 1.4 Ma, i.e., the age of lavas in the overlying Hartley Formation ( Cornell et al., 2016 ), and younger than the Ongeluk Formation, which is estimated to be 2426 ± 3 Ma ( Gumsley et al...
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Seismic profile KBF01, ( A ) stacked and migrated, ( B)  interpreted. Inset...
Published: 01 June 2002
Olifantshoek in turn is overthrust by the stratigraphically older Ongeluk and Makganyene Formations. White arrows = apparent direction of thrusting. Red dashed line = cover/basement interface.
Journal Article
Published: 01 March 2023
South African Journal of Geology (2023) 126 (1): 75–92.
...., 2004b ), the Bushveld Complex and related intrusions ( Barnes et al., 2010 ) and the Ongeluk Formation (Humbert et al., 2018). (C) and (D) Multi-element diagrams normalised to primitive mantle after McDonough and Sun ( 1995 ) for the Puduhush gabbro samples (solid black lines), compared to the above...
FIGURES | View All (10)
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Comparisons of ( a ) ( c ) major and ( b ) ( d ) minor/trace element compos...
Published: 01 June 2006
equivalent of the Ongeluk basalt underlying the Gamagara/Mapedi Formation; see Figure 2 ; Beukes et al. , 2002 ), and those between the lower section red shales of the Gamagara/Mapedi Formation vs. the reworked materials of said weathering profile. Units used: ( a ) ( c ) [weight %] and ( b ) ( d ) [ppm
Journal Article
Published: 01 March 2020
South African Journal of Geology (2020) 123 (1): 1–18.
... the pre-Gamagara unconformity intersects the Kuruman Iron Formation (Asbestos Hills Subgroup) and mafic volcanic rocks of the Ongeluk Formation respectively ( Figure 1 ). This erosional surface can regionally be traced along strike for almost 700 km from South Africa into Botswana ( Gutzmer and Beukes...
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Journal Article
Journal: Economic Geology
Published: 01 May 2001
Economic Geology (2001) 96 (3): 621–631.
... between the underlying Ongeluk lavas and the overlying dolomitic Mooidraai Formation. The strata are very gently folded, dipping westward 5° to 15° throughout the Kalahari manganese field. Two main ore types are present in the Kalahari manganese deposit ( Cairncross et al., 1997 ): low-grade carbonate...
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Journal Article
Journal: Geology
Published: 01 June 2002
Geology (2002) 30 (6): 491–494.
... area and that it changed laterally into the conformity between Ongeluk lava and Hotazel iron- formation ( Fig. 1A ) in Griqualand West ( Button, 1976 ). Such a transition implies that the Hekpoort paleosol is older than the Wolhaarkop laterites, which developed after the deposition of the Hotazel...
FIGURES
Journal Article
Published: 01 June 2018
South African Journal of Geology (2018) 121 (2): 157–170.
..., subsequent to earlier erosion along the African land surface. Stratigraphically, the selected boreholes are shown to contain several secondary thrust faults that have further duplicated the stratigraphy, emplacing packages of Ongeluk Formation lava on top of thrusted Hotazel Formation ( Figure 3...
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Journal Article
Published: 01 June 2006
South African Journal of Geology (2006) 109 (1-2): 123–138.
... equivalent of the Ongeluk basalt underlying the Gamagara/Mapedi Formation; see Figure 2 ; Beukes et al. , 2002 ), and those between the lower section red shales of the Gamagara/Mapedi Formation vs. the reworked materials of said weathering profile. Units used: ( a ) ( c ) [weight %] and ( b ) ( d ) [ppm...
FIGURES | View All (15)
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Paleoproterozoic APWP for the Kaapvaal craton, with new poles WUBS-I (high-...
Published: 01 June 2006
Figure 15. Paleoproterozoic APWP for the Kaapvaal craton, with new poles WUBS-I (high-temperature component for the lower part of Swaershoek Formation) and WUBS-II (dual polarity high-temperature component from the upper part of the Swaershoek Formation and the Alma Formation) shaded. Outline