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Journal Article

Genesis of Vanadium Ores in the Otavi Mountainland, Namibia Available to Purchase

Maria Boni, Rosario Terracciano, Noreen J. Evans, Carsten Laukamp, Jens Schneider, Thilo Bechstädt
Journal: Economic Geology
Published: 01 May 2007
Economic Geology (2007) 102 (3): 441–469.
DOI: https://doi.org/10.2113/gsecongeo.102.3.441
...Maria Boni; Rosario Terracciano; Noreen J. Evans; Carsten Laukamp; Jens Schneider; Thilo Bechstädt Abstract Zn-Cu-Pb vanadate ores (descloizite, mottramite, and vanadinite) in the Otavi Mountainland, Namibia, once were considered the greatest vanadium deposits in the world, with resources...
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View PDF for article title, Genesis of Vanadium Ores in the <span class="search-highlight">Otavi</span> <span class="search-highlight">Mountainland</span>, Namibia
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Tectonostratigraphic evolution of the Otavi Mountainland from Cambrian to Holocene. On the right are shown the most important morphological stages and the age data key for vanadate mineralization.

Tectonostratigraphic evolution of the Otavi Mountainland from Cambrian to H... Available to Purchase

Published: 01 May 2007
F ig . 3. Tectonostratigraphic evolution of the Otavi Mountainland from Cambrian to Holocene. On the right are shown the most important morphological stages and the age data key for vanadate mineralization.
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Typical ore samples from the Otavi Mountainland mining district. (A) Descloizite I (reddish) and saddle dolomite gangue (Berg Aukas). (B) Saddle dolomite gangue and microcrystals of descloizite II (Berg Aukas). (C) Collapse breccia with Proterozoic dolomite clasts cemented by descloizite I and “saddle” dolomite (Berg Aukas). (D) Cavity filled with descloizite crystals and sparry calcite in the laminated limestone (T3) of the Maieberg Formation (Okorundu pit). (E) Internal gray sediment from the deeper collapse breccias, with descloizite crystals growing in layers (Berg Aukas). (F) Group of tabular descloizite crystals (Wolkenhauben). (G) Thin veins of mottramite (green) and calcite cutting the dolomite of the Hüttenberg Formation (Gross Otavi).

Typical ore samples from the Otavi Mountainland mining district. (A) Desclo... Available to Purchase

Published: 01 May 2007
F ig . 7. Typical ore samples from the Otavi Mountainland mining district. (A) Descloizite I (reddish) and saddle dolomite gangue (Berg Aukas). (B) Saddle dolomite gangue and microcrystals of descloizite II (Berg Aukas). (C) Collapse breccia with Proterozoic dolomite clasts cemented
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Geologic map of the Otavi Mountainland marking the most important localities where vanadium ores have been exploited (modified from Chetty and Frimmel, 2000).

Geologic map of the Otavi Mountainland marking the most important localitie... Available to Purchase

Published: 01 May 2007
F ig . 1. Geologic map of the Otavi Mountainland marking the most important localities where vanadium ores have been exploited (modified from Chetty and Frimmel, 2000 ).
Image
(a) Amplitude spectrum of the magnetic field in the Otavi Mountainland and adjacent areas (Platveld). A square of 100km to a side was analysed. The white depths zi (i = 1,2,3…) of the linear curve section are 10.5, 2.7 and 0.6km indicating three average depth levels where the magnetic sources are buried.

( a ) Amplitude spectrum of the magnetic field in the Otavi Mountainland an... Available to Purchase

Published: 01 December 2002
Figure 8. ( a ) Amplitude spectrum of the magnetic field in the Otavi Mountainland and adjacent areas (Platveld). A square of 100km to a side was analysed. The white depths z i (i = 1,2,3…) of the linear curve section are 10.5, 2.7 and 0.6km indicating three average depth levels where
Journal Article

The geology of the Neoproterozoic Swakop-Otavi transition zone in the Outjo District, northern Damara Orogen, Namibia Available to Purchase

Tom N. Clifford
Published: 01 March 2008
South African Journal of Geology (2008) 111 (1): 117–140.
DOI: https://doi.org/10.2113/gssajg.111.1.117
... of the regional Ugab and Uranus-Neuland Synclines; it is most likely correlative with the Mulden Group of the Otavi Mountainland. The Damaran regional structure of area is characterized by: D 1 an early phase of southward-directed gravity nappes ; D 2 the regionally dominant northeast-southwest to east-west...
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View PDF for article title, The geology of the Neoproterozoic Swakop-<span class="search-highlight">Otavi</span> transition zone in the Outjo District, northern Damara Orogen, Namibia
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Journal Article

Sedimentology and chemostratigraphy of the late Neoproterozoic carbonate ramp sequences of the Hüttenberg Formation (northwestern Namibia) and the C5 Formation (western central Democratic Republic of Congo): Record of the late post-Marinoan marine transgression on the margin of the Congo Craton Available to Purchase

F. Delpomdor, S. Schröder, A. Préat, P. Lapointe, C. Blanpied
Published: 01 March 2018
South African Journal of Geology (2018) 121 (1): 23–42.
DOI: https://doi.org/10.25131/sajg.121.0003
... is a prelude to the Pan African Orogeny in Central Africa. In this paper, we present new descriptions of these carbonate rocks and a sedimentological study from key cores and outcrops in the Otavi Mountainland (Namibia) and West Congo belt (DRC) of the Hüttenberg Formation and the C5 Formation, respectively...
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View PDF for article title, Sedimentology and chemostratigraphy of the late Neoproterozoic carbonate ramp sequences of the Hüttenberg Formation (northwestern Namibia) and the C5 Formation (western central Democratic Republic of Congo): Record of the late post-Marinoan marine transgression on the margin of the Congo Craton
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Journal Article

The regional magnetic data set of Namibia: Compilation, contributions to crustal studies and support to natural resource management Available to Purchase

D.G. Eberle, G. Andritzky, D.G. Hutchins, R. Wackerle
Published: 01 December 2002
South African Journal of Geology (2002) 105 (4): 361–380.
DOI: https://doi.org/10.2113/1050361
...Figure 8. ( a ) Amplitude spectrum of the magnetic field in the Otavi Mountainland and adjacent areas (Platveld). A square of 100km to a side was analysed. The white depths z i (i = 1,2,3…) of the linear curve section are 10.5, 2.7 and 0.6km indicating three average depth levels where...
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View PDF for article title, The regional magnetic data set of Namibia: Compilation, contributions to crustal studies and support to natural resource management
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Simplified paragenetic sequence of vanadate mineralization in the Otavi Mountainland.

Simplified paragenetic sequence of vanadate mineralization in the Otavi Mou... Available to Purchase

Published: 01 May 2007
F ig . 16. Simplified paragenetic sequence of vanadate mineralization in the Otavi Mountainland.
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Tectonostratigraphic evolution and ages of the Damara Supergroup (Neoproterozoic) in the Otavi Mountainland.

Tectonostratigraphic evolution and ages of the Damara Supergroup (Neoproter... Available to Purchase

Published: 01 May 2007
F ig . 2. Tectonostratigraphic evolution and ages of the Damara Supergroup (Neoproterozoic) in the Otavi Mountainland.
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Magnetic profile crossing the Northern Zone (NZ after Miller, 1983a) and the Otavi Mountainland with two interpretation models: (a) rift model, (b) thinning of magnetic crust in the area of the NZ due to increased vertical heat flow.

Magnetic profile crossing the Northern Zone (NZ after Miller, 1983a ) and ... Available to Purchase

Published: 01 December 2002
Figure 6. Magnetic profile crossing the Northern Zone (NZ after Miller, 1983a ) and the Otavi Mountainland with two interpretation models: ( a ) rift model, ( b ) thinning of magnetic crust in the area of the NZ due to increased vertical heat flow.
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Sedimentary log drawn through the glacial succession of the Haartbeespoort area, central Otavi Mountainland, northern Namibia (see Fig. 1E for location). The positions of both outcrop photographs (Fig. 10) and thin-section interpretations (Fig. 11) are shown.

Sedimentary log drawn through the glacial succession of the Haartbeespoort ... Available to Purchase

Published: 29 May 2018
Fig. 9.— Sedimentary log drawn through the glacial succession of the Haartbeespoort area, central Otavi Mountainland, northern Namibia (see Fig. 1 E for location). The positions of both outcrop photographs ( Fig. 10 ) and thin-section interpretations ( Fig. 11 ) are shown.
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Bouguer gravity Dg data and anomalies ΔT of the total magnetic intensiy along a traverse running from Osire (northern Central Zone) to the Otavi Mountainland (Northern Zone). The gravity profile was interpolated from the Namibia countrywide gravity data set collected largely along major roads and with hardly any data in between

Bouguer gravity Dg data and anomalies ΔT of the total magnetic intensiy alo... Available to Purchase

Published: 01 December 2002
Figure 7. Bouguer gravity Dg data and anomalies ΔT of the total magnetic intensiy along a traverse running from Osire (northern Central Zone) to the Otavi Mountainland (Northern Zone). The gravity profile was interpolated from the Namibia countrywide gravity data set collected largely along
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Identification of fractures in the area immediately to the north of the Kombat Mine (Otavi Mountainland) using high resolution helicopter-borne magnetics with flight lines 500m apart and sensor height 50m a.g.l. (Sengpiel et al., 1999). The image displays the residual field which is the difference of the measured and the 100m upward continued fields. Northing and easting are given by UTM co-ordinates in metres.

Identification of fractures in the area immediately to the north of the Kom... Available to Purchase

Published: 01 December 2002
Figure 9. Identification of fractures in the area immediately to the north of the Kombat Mine (Otavi Mountainland) using high resolution helicopter-borne magnetics with flight lines 500m apart and sensor height 50m a.g.l. ( Sengpiel et al ., 1999 ). The image displays the residual field which
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Series of simplified geological location maps for each of the case studies described in this paper. A) Macduff, on the Banffshire coastline, NE Scotland. The glacial unit of interest here is the Macduff Slate Formation, of probable Cryogenian age. B) Regional map of Namibia showing the location of the various case studies discussed herein. C) Geological sketch map of the Ghaub–Varianto farm area, eastern Otavi Mountainland, northern Namibia. The glacial unit of interest here is the Chuos Formation, of early Cryogenian age. D) The Omutirapo outcrop area in the Sesfontein region. Basemap modified from Hoffman and Halverson (2008). E) Outcrops east of Otavi, in the Haartbeespoort area. Base map modified after Geological Survey of Namibia (2008).

Series of simplified geological location maps for each of the case studies ... Available to Purchase

Published: 29 May 2018
the location of the various case studies discussed herein. C) Geological sketch map of the Ghaub–Varianto farm area, eastern Otavi Mountainland, northern Namibia. The glacial unit of interest here is the Chuos Formation, of early Cryogenian age. D) The Omutirapo outcrop area in the Sesfontein region
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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. B) Recumbent, isoclinal intrabed fold. C) Equant lonestones sitting within well stratified diamictite showing evidence for puncturing of laminae beneath the clasts. Note that pervasive horizontal fabric is defined not only by the laminae but also by attenuated clast geometries (note clast shapes below the coin). D) Rotational structures at the macro-scale within the stratified diamictite. E) Attenuated clast fabric: clast A axes are arranged in a bedding-parallel orientation. F) Boulder-sized lonestone of sandstone with a lower contact that punctures laminae in the diamictite and evidence for onlap at the clast margins. G) Outcrop-scale perspective of the attenuated clast fabric, with boulders below the hammer (sandstone clasts) unaffected by this fabric. H) Delicately laminated Maiberg Formation bearing granule-size outsize clasts which deflect underlying laminae. I) Highly attenuated clasts in the Ghaub Formation of the Brandberg area, central Namibia. Taken from adjacent to the dry Ugab River bed at 20°00′800′′S, 14°40′887′′E. Scales: coin is 20.5 mm in diameter, lens cap is 58 mm wide, hammer is 279 mm long.

Outcrop characteristics of Ghaub Formation diamictites exposed at Haartbees... Available to Purchase

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
Journal Article

Dryland dunes and other dryland environmental archives as proxies for Late Quaternary stratigraphy and environmental and climate change in southern Africa Available to Purchase

A. Stone
Published: 01 December 2021
South African Journal of Geology (2021) 124 (4): 927–962.
DOI: https://doi.org/10.25131/sajg.124.0055
... stalagmite (site 1) is in the Kaokoveld karst terrain of the Joubert Mountains ( Irish et al., 2001 ), within the upper catchment of the Hoarusib River ( Railsback et al., 2016 ). There are also speleothems in the carbonate succession of the Otavi Group sediments ( Miller, 2008 ), and the Otavi Mountainland...
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View PDF for article title, Dryland dunes and other dryland environmental archives as proxies for Late Quaternary stratigraphy and environmental and climate change in southern Africa
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Journal Article

Hereroite and vladkrivovichevite: two novel lead oxychlorides from the Kombat mine, Namibia Available to Purchase

R. Turner, O. I. Siidra, M. S. Rumsey, S. V. Krivovichev, C. J. Stanley, J. Spratt
Published: 01 August 2012
Mineralogical Magazine (2012) 76 (4): 883–890.
DOI: https://doi.org/10.1180/minmag.2012.076.4.05
... fragment has been designated as the holotype specimen for both species and is stored at the Natural History Museum in London under catalogue number BM2010, 101. The Kombat mine orebodies contain primary Pb-Cu-Zn(-Ag) sulfides, and are similar to other deposits in the Otavi Mountainland...
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View PDF for article title, Hereroite and vladkrivovichevite: two novel lead oxychlorides from the Kombat mine, Namibia
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Snowball Earth Under the Microscope Available to Purchase

Marie Elen Busfield, Daniel Paul Le Heron
Published: 29 May 2018
Journal of Sedimentary Research (2018) 88 (5): 659–677.
DOI: https://doi.org/10.2110/jsr.2018.34
...Fig. 9.— Sedimentary log drawn through the glacial succession of the Haartbeespoort area, central Otavi Mountainland, northern Namibia (see Fig. 1 E for location). The positions of both outcrop photographs ( Fig. 10 ) and thin-section interpretations ( Fig. 11 ) are shown. ...
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Journal Article

Hydrogeochemistry of the Tsumeb Deposit: Implications for Arsenate Mineral Stability Available to Purchase

Robert J. Bowell
Published: 01 January 2014
Reviews in Mineralogy and Geochemistry (2014) 79 (1): 589–627.
DOI: https://doi.org/10.2138/rmg.2014.79.14
... ) The solubility and stability of scorodite, FeAsO 4 ·2H 2 O . Am Mineral 70 : 838 – 844 Emslie DP ( 1979 ) The mineralogy and geochemistry of the copper, lead and zinc sulphides of the Otavi mountainland, south west Africa . PhD thesis (unpublished), University of the Orange Free State...
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