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Ghaub Formation

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Journal Article
Journal: Geology
Published: 01 September 2004
Geology (2004) 32 (9): 817-820.
...K.-H. Hoffmann; D.J. Condon; S.A. Bowring; J.L. Crowley Abstract Dropstone-bearing glaciomarine sedimentary rocks of the Ghaub Formation within metamorphosed Neoproterozoic basinal strata (Swakop Group) in central Namibia contain interbedded mafic lava flows and thin felsic ash beds. U-Pb zircon...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2011
GSA Bulletin (2011) 123 (7-8): 1448-1477.
...Eugene W. Domack; Paul F. Hoffman Abstract Our detailed examination of the Ghaub Formation (possibly 635 Ma) on the distal foreslope of the Otavi carbonate platform is part of a regional study of the Congo paleocontinental margin in northwestern Namibia. Detrital carbonates of the Ghaub Formation...
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Journal Article
Published: 01 December 2005
South African Journal of Geology (2005) 108 (4): 557-577.
... break, where the seafloor would have been 550 to 800 m below the top of the platform based on modern analogs. The eastern third of the ridge angles up the foreslope to the platform edge. The Ghaub Formation is a sharply-bounded wedge of glacial marine strata that blankets the lower foreslope and tapers...
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Outcrop characteristics of <b>Ghaub</b> <b>Formation</b> diamictites exposed at Haartbees...
Published: 29 May 2018
Fig. 10.— Outcrop characteristics of Ghaub Formation diamictites exposed at Haartbeespoort Farm, Otavi Mountainland of northern Namibia. Refer to Figure 9 for stratigraphic context. A) Pebble- to cobble-size, well rounded sandstone clasts punctuating well stratified carbonate-rich diamictite
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Reconnaissance measured sections of the <b>Ghaub</b> <b>Formation</b> on Fransfontein hom...
Published: 01 July 2011
Figure 4. Reconnaissance measured sections of the Ghaub Formation on Fransfontein homocline east of district road C35 ( Figs. 2A and 2B ), corresponding to columns 6–14 in Figure 3 . The prograded and semi-amalgamated diamictite complex of the main Ghaub Formation contrasts with lateral
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Outcrop images of the Bethanis Member of the <b>Ghaub</b> <b>Formation</b> illustrating t...
Published: 01 July 2011
Figure 13. Outcrop images of the Bethanis Member of the Ghaub Formation illustrating the following: (A) and (E) megaboulders of dolomitic stromatolite concentrated in base of Bethanis Member exposed in single outcrop (see Fig. 6 ) from left (A) to right (E) (note draping [white lines] of thinner
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Bedding and clast characteristics of the <b>Ghaub</b> <b>Formation</b> illustrating the f...
Published: 01 July 2011
Figure 14. Bedding and clast characteristics of the Ghaub Formation illustrating the following: (A–G, J) dropstone structures and clasts of all sizes, from boulders (A), cobbles (B, J), and pebbles (D, E–G) to granules (C). Note the interlaminated facies of mudstone associated with the ice-rafted
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Schematic of the relative thickness of the <b>Ghaub</b> <b>Formation</b> along a east to ...
Published: 01 July 2011
Figure 16. Schematic of the relative thickness of the Ghaub Formation along a east to west transect, parallel to the slope Refer to Figures 3–8, and 10 for information on the internal character of the Ghuab Formation as summarized in this diagram. Top insets (south to north sections) illustrate
Journal Article
Published: 29 May 2018
Journal of Sedimentary Research (2018) 88 (5): 659-677.
...Fig. 10.— Outcrop characteristics of Ghaub Formation diamictites exposed at Haartbeespoort Farm, Otavi Mountainland of northern Namibia. Refer to Figure 9 for stratigraphic context. A) Pebble- to cobble-size, well rounded sandstone clasts punctuating well stratified carbonate-rich diamictite...
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Journal Article
Journal: Geology
Published: 01 January 2002
Geology (2002) 30 (1): 35-38.
.... 600 Ma Ghaub Formation (Congo craton), Blässkrans Formation (northwestern Kalahari craton) and Wildrose Diamictite (southwestern Laurentia), and the post–595 Ma lower Southern Highland Group (northeast Laurentia). These dropstone intervals are interstratified with hemipelagic, dropstone-free...
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Series: Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP326.15
EISBN: 9781862395749
..., of special economic interest. This paper concentrates on the Ghaub Formation diamictite interval in northern Namibia and the major environmental change in the aftermath of the assumed glaciation. The relationship of the post-glacial sediments with the underlying different types of cap carbonate...
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Journal Article
Journal: Geology
Published: 01 August 2016
Geology (2016) 44 (8): 631-634.
... from widely separated localities of the Marinoan-equivalent Ghaub Formation in Namibia: 639.29 ± 0.26 Ma and 635.21 ± 0.59 Ma. These findings verify, for the first time, the key prediction of the snowball Earth hypothesis for the Marinoan glaciation, i.e., longevity, with a duration of ≥4 m.y...
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Simple composite sedimentary log of the Chuos <b>Formation</b> in the <b>Ghaub</b> and Va...
Published: 29 May 2018
Fig. 5.— Simple composite sedimentary log of the Chuos Formation in the Ghaub and Varianto Farm areas of northern Namibia (see Fig. 1 B and C for location). The positions of both outcrop photographs ( Fig. 6 ) and thin-section interpretations ( Figs. 7 , 8 ) are shown. From Busfield and Le
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Thin-section photographs of Chuos <b>Formation</b> microstructures at <b>Ghaub</b>–Varian...
Published: 29 May 2018
Fig. 8.— Thin-section photographs of Chuos Formation microstructures at Ghaub–Varianto (A–D) and Omutirapo (E–H). Stratigraphic context of photos A–D is shown in Figure 5. White bar is 1 mm. A) Sheared diamictite from the lower ductile zone showing arcuate grain alignments, S-C shear structures
Series: Geological Society, London, Memoirs
Published: 01 January 2011
DOI: 10.1144/M36.14
EISBN: 9781862394117
... trough and moraine, and district road C35. A glacial origin for the carbonate-clast diamictite (now Ghaub Formation) on the Fransfontein foreslope (Fig.  14.1 b) was rejected by Frets (1969) , who favoured submarine landsliding in response to a fall in base level. This view was taken up by Martin...
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Oblique aerial photo mosaic of outcrop of Ghuab <b>Formation</b> found in drainage...
Published: 01 July 2011
Figure 6. Oblique aerial photo mosaic of outcrop of Ghuab Formation found in drainage. Contacts of lithofacies within Ghaub Formation are indicated, as well as bold lines of the contact with the Franni-aus Member of the Ombaatjie Formation, dashed line indicates dolomitization front. Location
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Oblique aerial photo mosaic of outcrop of Ghuab <b>Formation</b> found in stream g...
Published: 01 July 2011
Figure 7. Oblique aerial photo mosaic of outcrop of Ghuab Formation found in stream gully. Contacts of lithofacies within Ghaub Formation are indicated, as well as bold lines of the contact with the Franni-aus Member of the Ombaatjie Formation. Location of measured sections is indicated
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Outcrop images of intervals in the Ghuab <b>Formation</b> illustrating: (A) thin i...
Published: 01 July 2011
shear deformation in proximity to contact), (D) abrupt contact of the Franni-aus intraclast breccias with the orange, dolomitic, siltstone of the lower Ghaub Formation (see Fig. 7 ), (E) disconformity of the lower Ghaub Formation orange, dolomitic siltstone with underlying Franni-aus breccia (see Fig
Journal Article
Published: 01 March 2018
South African Journal of Geology (2018) 121 (1): 23-42.
..., glacial diamictites and associated cap carbonates occur at the base of the Abenab (Sturtian) and Tsumeb (Marinoan) subgroups, the Varianto and Ghaub formations respectively ( Figure 2A ). The maximum age of the Varianto Formation is 746 ± 2 Ma based on U-Pb ages in a tuff of the Naauport Formation west...
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Oblique photo mosaic of outcrop of Ghuab <b>Formation</b> and associated Bethanis ...
Published: 01 July 2011
Figure 8. Oblique photo mosaic of outcrop of Ghuab Formation and associated Bethanis Member found in drainage (photo taken from adjacent ridge to the northeast). Contacts of lithofacies within Ghaub Formation are indicated, as well as bold lines of the contact with the Keilberg Member