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Chuos Formation

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Series: Geological Society, London, Special Publications
Published: 01 January 2019
DOI: 10.1144/SP475.2
EISBN: 9781786204141
... in the Cryogenian. Models for NIFs therefore need to explain the widespread oxidation of the ferruginous oceans during the Sturtian. The Chuos Formation of Namibia records deposition during the Sturtian glaciation and is locally iron-rich (<60 wt% Fe; Lechte & Wallace 2016 ). The abundance of well...
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Journal Article
Journal: Geosphere
Published: 01 June 2017
Geosphere (2017) 13 (3): 811-837.
... thickening are poorly known. We studied three local thickenings of the Sturtian Chuos Formation in northern Namibia by measuring closely spaced columnar sections, not only of the synglacial deposits but also of the bounding pre- and post-glacial strata. This enabled incised paleovalleys filled by glacial...
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Simple composite sedimentary log of the <b>Chuos</b> <b>Formation</b> in the Ghaub 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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Outcrop expression of <b>Chuos</b> <b>Formation</b> diamictites in northern Namibia at Gh...
Published: 29 May 2018
Fig. 6.— Outcrop expression of Chuos Formation diamictites in northern Namibia at Ghaub–Varianto (A–F) and Omutirapo (G, H). See Figure 5 for stratigraphic context. A) High-strain zone with attenuated clasts. B) Small, asymmetric fold with sense of shear indicated. C) Clast with asymmetric
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Paired thin-section photograph and interpretation of <b>Chuos</b> <b>Formation</b> micros...
Published: 29 May 2018
Fig. 7.— Paired thin-section photograph and interpretation of Chuos Formation microstructures at Ghaub–Varianto (Parts A–C) and Omutirapo ( Part D). Refer to Figure 5 for stratigraphic context. A) Lower ductile zone: well developed subhorizontal fabric and abundant rotational deformation
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Thin-section photographs of <b>Chuos</b> <b>Formation</b> microstructures at Ghaub–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
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Bar graph of syn-glacial <b>Chuos</b> <b>Formation</b> stratigraphic thicknesses in 88 co...
in > Geosphere
Published: 01 June 2017
Figure 1. Bar graph of syn-glacial Chuos Formation stratigraphic thicknesses in 88 columnar sections (including 38 from this study) measured by the authors in northern Namibia, in order of increasing thickness from left to right.
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Columnar sections of the <b>Chuos</b> <b>Formation</b> diamictite wedge in the southweste...
in > Geosphere
Published: 01 June 2017
Figure 16. Columnar sections of the Chuos Formation diamictite wedge in the southwestern half of the Vrede south dome ( Fig. 10 ), showing its relations to the Ugab Subgroup, to the Rasthof and Narachaams Formations of the nonglacial Abenab Subgroup (Cryogenian), to the Marinoan glacial erosion
Journal Article
Published: 01 March 2011
South African Journal of Geology (2011) 114 (1): 57-76.
... with regional profiles in the southern Central Zone would indicate that it is hosted by the Etusis Formation (Fe-rich feldspar-quartz rocks) of the Nosib Group, in a condensed stratigraphic section of the supergroup, and not the Chuos Formation (diamictite, turbidite and thin iron-formation layers...
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Columnar sections of the lower Naauwpoort(?) and <b>Chuos</b> <b>Formations</b> in the To...
in > Geosphere
Published: 01 June 2017
Figure 19. Columnar sections of the lower Naauwpoort(?) and Chuos Formations in the Toekoms syn-glacial half graben (see Fig. 17 and satellite view inset for locations). Vertical datum (0 m) is the base of the Rasthof Formation cap limestone. Note the thin glacigenic diamictite directly beneath
Journal Article
Published: 29 May 2018
Journal of Sedimentary Research (2018) 88 (5): 659-677.
...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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Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/SP286.7
EISBN: 9781862395343
... at the top and thinner layers in the steep furrows on both sides of the crest. To the contrary, stromatolites in the Rasthof Formation are constructed of nearly parallel lamina, and there are numerous brecciated horizons. The Rasthof Formation overlies the Chuos diamictite (the Chuos Formation...
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Journal Article
Published: 01 June 2001
South African Journal of Geology (2001) 104 (2): 115-136.
... with thinned continental crust. In the Windhoek Rift Zone, terrestrial conditions prevailed and the newly deposited rift sequences were subjected to erosion. Succeeding the primary rifting was the Chuos Formation glacial/marine event, which produced thick deposits along the northern and western margins...
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Journal Article
Journal: Geology
Published: 01 January 2002
Geology (2002) 30 (1): 35-38.
...D.J. Condon; A.R. Prave; D.I. Benn Abstract Stratigraphically discrete glacigenic dropstone intervals have been identified within six separate Neoproterozoic glaciomarine successions: the ca. 720 Ma Chuos Formation (southwestern Congo craton) and Surprise Diamictite (southwestern Laurentia), the ca...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP401.11
EISBN: 9781862396777
... of the lateral spatial heterogeneity of magma eruptions, and their relationship with the surface abundances of radioactive elements. We also re-evaluate the effects of resolidification of melt pools generated by large impacts, such as the formation of the SPA Basin, as previous studies have discussed in detail...
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Journal Article
Journal: Clay Minerals
Published: 01 May 2013
Clay Minerals (2013) 48 (2): 363-382.
..., buffer component, gap between buffer materials, gap between outside wall and buffer block, and type of water. The results from the experiment show the condition of the self-sealing function of bentonite materials, formation of piping, allowable limit of inflow rate in the case of an Na type bentonite...
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Journal Article
Journal: Geophysics
Published: 25 September 2017
Geophysics (2017) 82 (6): D353-D368.
... by the maximum peak amplitude in each computational case. Table 1. List of parameters and values. Parameters Descriptions Values α f P-velocity of the fluid 1500    m / s α P-velocity of the formation 3464    m / s α ′ P-velocity...
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Series: Geological Society, London, Special Publications
Published: 01 January 2019
DOI: 10.1144/SP482.16
EISBN: 9781786204288
..., the liquids were fed over a period of more than 7 years with controlled pressure. The formation of a full saturation region was judged based on a sufficient increment of the feeding pressure, whose early-stage temporal variation is shown in Figure 2 . For distilled water, the feeding pressure was increased...
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Journal Article
Published: 01 July 2003
Journal of Foraminiferal Research (2003) 33 (3): 219-236.
... the Indian and Eurasian Plates and closure of the Tethyan Ocean. The Eocene sequences consist of siltstone and mudstone with some limestone intercalations, and are divided into the Shaheed Ghat, Baska and Kirthar Formations in ascending order. We studied the Eocene biostratigraphy of planktic foraminifers...
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Series: Geological Society, London, Special Publications
Published: 01 January 2014
DOI: 10.1144/SP400.7
EISBN: 9781862396760
... Abstract Long-term gas migration through clays cannot be simulated by conventional two-phase flow models alone owing to the presence of material deformation. In this article, an extended two-phase flow model that incorporates mechanical effects is proposed. The model allows the formation...
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