1-20 OF 112 RESULTS FOR

Erongo Namibia

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 23 October 2018
The Canadian Mineralogist (2018) 56 (4): 425–449.
...Alexander U. Falster; William B. Simmons; Karen L. Webber; Andrew P. Boudreaux Abstract The early Cretaceous anorogenic, sub-volcanic Erongo Granite, Namibia, was emplaced into metasedimentary rocks of the Neoproterozoic to Cambrian Damaran Orogeny. The Erongo Granite contains pegmatitic miaroles...
FIGURES
First thumbnail for: Mineralogy and Geochemistry of the <span class="se...
Second thumbnail for: Mineralogy and Geochemistry of the <span class="se...
Third thumbnail for: Mineralogy and Geochemistry of the <span class="se...
Journal Article
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 695–710.
... isotope analyses for mantle-derived garnet xenocrysts from Kakanui, New Zealand, as well as magmatic and hydrothermal garnets (skarn) from two different localities in Erongo, Namibia. The in situ analyses are complemented by bulk mineral separate Fe isotope analyses for all samples and CO 2 laser...
FIGURES
First thumbnail for: Assessment of O and Fe isotope heterogeneity in ga...
Second thumbnail for: Assessment of O and Fe isotope heterogeneity in ga...
Third thumbnail for: Assessment of O and Fe isotope heterogeneity in ga...
Journal Article
Published: 01 May 2017
European Journal of Mineralogy (2017) 29 (2): 257–267.
...-tourmaline orbicules and NYF-type miarolitic pegmatites , Namibia . University of New Orleans Theses und Dissertations , Paper 1854 . Cairncross B. Bahmann U. ( 2006 ): Famous mineral localities: the Erongo mountains Namibia . Mineral. Record , 37 , 361 – 470 . Černý...
Journal Article
Published: 01 July 1990
South African Journal of Geology (1990) 93 (3): 485–504.
Image
Representative morphological features of the studied garnet crystals (binocular microphotographs) (a) xenocryst pyrope-rich garnet (Kakanui, New Zealand, KAK), (b) igneous almandine-rich garnet (Erongo, Namibia, ERO-R), (c) hydrothermal garnet (Erongo, Namibia, ERO-G). Online version in colour
Published: 01 July 2018
Fig. 1 Representative morphological features of the studied garnet crystals (binocular microphotographs) (a) xenocryst pyrope-rich garnet (Kakanui, New Zealand, KAK), (b) igneous almandine-rich garnet (Erongo, Namibia, ERO-R), (c) hydrothermal garnet (Erongo, Namibia, ERO-G). Online version
Journal Article
Published: 01 February 2012
Mineralogical Magazine (2012) 76 (1): 91–113.
... (aluminium saturation index, ASI >1), we analysed 15 quartz-hosted primary melt and fluid inclusions from pegmatites in the Ehrenfriedersdorf Complex (Erzgebirge, Germany) and 26 primary melt inclusions from leucogranites of the Ehrenfriedersdorf district (Germany), Kymi (Finland) and Erongo (Namibia...
FIGURES
First thumbnail for: Tin and associated metal and metalloid geochemistr...
Second thumbnail for: Tin and associated metal and metalloid geochemistr...
Third thumbnail for: Tin and associated metal and metalloid geochemistr...
Journal Article
Published: 01 January 2011
European Journal of Mineralogy (2011) 23 (1): 91–100.
... (Erongo, Namibia, and Antetezambato, Madagascar) has been performed by means of gemmological standard testing, electron-microprobe chemical analyses in wavelength-dispersive mode (EMPA-WDS), ultraviolet, visible and near-infrared (UV-Vis-NIR) and mid-infrared (MID-IR) spectroscopy, and single-crystal X...
FIGURES
First thumbnail for: Green andradite stones: gemmological and mineralog...
Second thumbnail for: Green andradite stones: gemmological and mineralog...
Third thumbnail for: Green andradite stones: gemmological and mineralog...
Journal Article
Published: 01 October 2008
American Mineralogist (2008) 93 (10): 1545–1549.
... to result in the domination of herderite over hydroxyl-herderite. Herderite is now documented from Mogok, Myanmar; Yichung, China; Brazil; and probably Erongo, Namibia. The pegmatites at Ehrenfriedersdorf, Germany have produced samples at the boundary between herderite and hydroxyl-herderite...
FIGURES
First thumbnail for: Herderite from Mogok, Myanmar, and comparison with...
Second thumbnail for: Herderite from Mogok, Myanmar, and comparison with...
Image
Examples of Li-bearing minerals observed in situ. (A) Coarse white prismatic spodumene crystal (4.5 × 0.9 × 0.6 m) in the Plumbago North pegmatite (Plumbago Mountain, Maine, USA). FromSimmons et al. (2020). (B) Large agglomeration of fine-grained lepidolite with albite at the base (LpA) overlain by layer of feldspar, cassiterite and petalite (FCP, white) and capped in an outer zone by elbaite–indicolite–rubellite tourmaline crystals in quartz (TQ), Molopo pegmatite, Brandberg, Erongo (Namibia). Scale shown on card is in centimetres.
Published: 01 August 2020
at the base (LpA) overlain by layer of feldspar, cassiterite and petalite (FCP, white) and capped in an outer zone by elbaite–indicolite–rubellite tourmaline crystals in quartz (TQ), Molopo pegmatite, Brandberg, Erongo (Namibia). Scale shown on card is in centimetres.
Image
Photomicrographs and backscattered electron image of tourmaline fibers from different localities. The left column displays plane-polarized light (PPL) images, and the right column displays cross-polarized light images (XPL). (a) Colorless, flexible tourmaline fibers from Minas Maria, Mexico (PPL). (b) Flexible tourmaline fibers from Minas Maria, Mexico. (c) Dark-blue to blue to reddish-brown birefringent acicular-fibrous grains from Minas Gerais, Brazil. (d) Acicular-fibrous grains from Minas Gerais. Note the heterogeneous birefringent colors within individual grains implying compositional variability. (e) Pale-blue to blue-green to blue birefringent tourmaline fibers from Erongo, Namibia. (f) Fibrous grains from Erongo. Note the color banding parallel to the prismatic faces and, in one instance, perpendicular to the prismatic faces. (g) A single blue-birefringent tourmaline from the same Erongo sample as Figure 5e. There is a discontinuous pale blue-green overgrowth at the +c end of the grain. (h) A single tourmaline grain showing banding in pleochroic colors parallel to the prismatic faces and discontinuous break at the pyramidal end of the grain. (i) Backscattered-electron image of the single tourmaline grain shown in Figures 5g and 5h. The shades of gray represent compositional variations with the darker-gray bands parallel to the prismatic faces being foitites and the lighter-gray bands parallel to the prismatic faces being schorl (see text for details). The tourmaline segment above the discontinuous break at the pyramidal pole is schorl-to-elbaite.
Published: 01 January 2016
compositional variability. (e) Pale-blue to blue-green to blue birefringent tourmaline fibers from Erongo, Namibia. (f) Fibrous grains from Erongo. Note the color banding parallel to the prismatic faces and, in one instance, perpendicular to the prismatic faces. (g) A single blue-birefringent tourmaline from
Image
Geologic features of northwest Namibia from Haapala et al. (2007) showing the Erongo and other intrusive complexes within the Damara orogenic zone.
Published: 23 October 2018
Fig. 3. Geologic features of northwest Namibia from Haapala et al . (2007) showing the Erongo and other intrusive complexes within the Damara orogenic zone.
Journal Article
Published: 01 February 2022
American Mineralogist (2022) 107 (2): 233–238.
... ( von Knorring and Condliffe 1987 ; Dias and Wilson 2000 ), the Khoroshiv District, Ukraine ( Lyckberg et al. 2009 ), and the Erongo region, Namibia ( Cairncross and Bahmann 2006 ) using Raman spectroscopy. Doubly polished sections were prepared from quartz, beryl, elbaite, tantalite-(Mn...
FIGURES
First thumbnail for: Peralkalinity in peraluminous granitic pegmatites....
Second thumbnail for: Peralkalinity in peraluminous granitic pegmatites....
Third thumbnail for: Peralkalinity in peraluminous granitic pegmatites....
Journal Article
Published: 01 May 2017
European Journal of Mineralogy (2017) 29 (2): 239–255.
... fractionation. Similar reactions involving jeremejevite or other precursor phases might explain chemical zonation and porous textures in tourmaline core zones reported in many experimental studies. The occurrence of natural tourmaline overgrowing jeremejevite in pegmatites of the Erongo Mountains, Namibia...
Series: Special Publications of the Society of Economic Geologists
Published: 01 January 2010
DOI: 10.5382/SP.15.2.17
EISBN: 9781629490403
...-northeast of the coastal resort town of Swakopmund within the Erongo region uranium province of west-central Namibia. The deposit lies at the northern end of Exclusive Prospecting License (EPL; EPL3138, Fig. 1 ), which is wholly owned by a local subsidiary of Extract Resources Limited, a public company...
Image
Spatial distribution of analysed dykes on a simplified geological map of the Cretaceous magmatic units and basement domains in the Etendeka province of northwest Namibia. Assignment to alkaline, mafic and felsic groups is based on Figure 2. Note the limited outcrop of Etendeka lavas compared with the dykes and sills (dykes from aeromagnetic data and satellite imagery: Miller, 1988; Lehtonen et al., 1995; Milner, 1997; Trumbull et al., 2004b). The main Damaraland intrusive complexes are labelled as follows: Brandberg (B); Messum (M); Cape Cross (C); Erongo (E); Spitzkoppe (S); Okenyenya (O); Paresis (P).
Published: 01 June 2021
Figure 1. Spatial distribution of analysed dykes on a simplified geological map of the Cretaceous magmatic units and basement domains in the Etendeka province of northwest Namibia. Assignment to alkaline, mafic and felsic groups is based on Figure 2 . Note the limited outcrop of Etendeka lavas
Image
(A) The abandoned Uis tin mine is located close to the former mining town of Uis in the Erongo region of Namibia, around 200 km north-northeast of the city of Swakopmund. (B) The mine site is within the Cape Cross-Uis belt, one of several northeast trending pegmatite belts known for Li-Nb-Ta-Sn mineralized zones (modified after Keller et al., 1999). (C) Simplified map of the abandoned Uis tin mine site showing the locations of the former open pits as well as of the coarse-grained spoil dumps and the fine-grained impoundment cell. The brick works is located close to the former mine buildings east of the dumps. Samples were taken from the four subcells and the large spoil dump.
Published: 01 September 2021
Figure 1. ( A ) The abandoned Uis tin mine is located close to the former mining town of Uis in the Erongo region of Namibia, around 200 km north-northeast of the city of Swakopmund. ( B ) The mine site is within the Cape Cross-Uis belt, one of several northeast trending pegmatite belts known
Journal Article
Published: 01 January 2016
The Canadian Mineralogist (2016) 54 (1): 311–335.
... compositional variability. (e) Pale-blue to blue-green to blue birefringent tourmaline fibers from Erongo, Namibia. (f) Fibrous grains from Erongo. Note the color banding parallel to the prismatic faces and, in one instance, perpendicular to the prismatic faces. (g) A single blue-birefringent tourmaline from...
FIGURES
First thumbnail for: Fibrous Tourmaline: a Sensitive Probe of Fluid Com...
Second thumbnail for: Fibrous Tourmaline: a Sensitive Probe of Fluid Com...
Third thumbnail for: Fibrous Tourmaline: a Sensitive Probe of Fluid Com...
Image
(a). Section through a miarolitic cavity (sample Rito12 from the Rito del Medio Pluton, New Mexico, United States), showing the transition from coarse-grained granite (bottom) through fine-grained, granophyric texture and then pegmatitic texture to open-space mineralization within the cavity (top). (b). Transmitted-light image of a doubly polished thick section through one-half of a quartz crystal from a miarolitic cavity in the Erongo Granite, Namibia, showing several pseudosecondary fluid inclusion trails starting on former growth surfaces, plus large, irregularly distributed (but not primary) fluid inclusions in the core. (c). Photomicrograph of brine inclusions on a pseudosecondary trail in a quartz crystal from the MTE prospect on Capitan Mountains, New Mexico, United States. (d). Coexisting vapor-rich inclusions and brine inclusions on a pseudosecondary trail in a quartz crystal from the Trewhellas Lode, Mole Granite, Australia. The latter two photomicrographs were taken in transmitted light and were enhanced by focus stacking.
Published: 01 September 2019
the cavity (top). (b). Transmitted-light image of a doubly polished thick section through one-half of a quartz crystal from a miarolitic cavity in the Erongo Granite, Namibia, showing several pseudosecondary fluid inclusion trails starting on former growth surfaces, plus large, irregularly distributed
Journal Article
Published: 31 July 2019
Geochemistry: Exploration, Environment, Analysis (2020) 20 (1): 99–111.
... reserved 2019 © 2019 The Author(s) Namibia heavy minerals heavy mineral sands garnet magnetite pXRF XRD Fig. 2. Simplified geological map of Namibia (modified from Clifford 2008 ). Sediment in coastal Namibia and southern Angola is primarily derived from the Oranje River...
FIGURES
First thumbnail for: The application of pXRF for the chemical and miner...
Second thumbnail for: The application of pXRF for the chemical and miner...
Third thumbnail for: The application of pXRF for the chemical and miner...
Journal Article
Published: 21 December 2020
The Canadian Mineralogist (2020) 58 (6): 703–715.
...-volcanic granite-miarolitic-pegmatite complex, Erongo, Namibia . Canadian Mineralogist 56 , 425 – 449 . Fenn, P.M. (1977) The nucleation and growth of alkali feldspars from hydrous melts . Canadian...
FIGURES
First thumbnail for: The Zebra granitic pegmatite, San Luis, Argentina
Second thumbnail for: The Zebra granitic pegmatite, San Luis, Argentina
Third thumbnail for: The Zebra granitic pegmatite, San Luis, Argentina