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Journal articles on the topic 'Namibia {Geologie}'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Eckardt, Frank D., Ian Livingstone, Mary Seely, and Johanna Von holdt. "The surface geology and geomorphology around gobabeb, namib desert, namibia." Geografiska Annaler: Series A, Physical Geography 95, no. 4 (December 2013): 271–84. http://dx.doi.org/10.1111/geoa.12028.

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2

Fleming, Alastair, and Zoé Fleming. "Topics Namibia for the amateur geologist." Geology Today 16, no. 3 (May 2000): 107–11. http://dx.doi.org/10.1046/j.1365-2451.2000.00006.x.

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3

Basson, I. J., M. J. McCall, J. Andrew, and E. Daweti. "Structural controls on mineralisation at the Namib Lead and Zinc Mine, Damara Belt, Namibia." Ore Geology Reviews 95 (April 2018): 931–44. http://dx.doi.org/10.1016/j.oregeorev.2018.03.028.

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4

Clemson, J., J. Cartwright, and R. Swart. "The Namib Rift: a rift system of possible Karoo age, offshore Namibia." Geological Society, London, Special Publications 153, no. 1 (1999): 381–402. http://dx.doi.org/10.1144/gsl.sp.1999.153.01.23.

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5

Eckardt, F. D., and B. Spiro. "The origin of sulphur in gypsum and dissolved sulphate in the Central Namib Desert, Namibia." Sedimentary Geology 123, no. 3-4 (February 1999): 255–73. http://dx.doi.org/10.1016/s0037-0738(98)00137-7.

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6

Cook, Robert B. "Connoisseur'sChoice: Cerussite, Tsumeb, Namibia." Rocks & Minerals 72, no. 3 (May 1997): 176–80. http://dx.doi.org/10.1080/00357529709605035.

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7

Miller, R. McG, C. Krapf, T. Hoey, J. Fitchett, A.-K. Nguno, R. Muyambas, A. Ndeutepo, A. Medialdea, A. Whitehead, and I. Stengel. "A sedimentological record of fluvial-aeolian interactions and climate variability in the hyperarid northern Namib Desert, Namibia." South African Journal of Geology 124, no. 3 (September 1, 2021): 575–610. http://dx.doi.org/10.25131/sajg.124.0008.

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Abstract The aeolian regime of the 100 km wide, hyperarid Namib Desert has been sporadically punctuated by the deposition of fluvial sediments generated during periods of higher humidity either further inland or well within the desert from Late Oligocene to Late Holocene. Four new Late Cenozoic formations are described from the northern Skeleton Coast and compared with formations further south: the Klein Nadas, Nadas (gravels, sands), Vulture’s Nest (silts) and Uniab Boulder Formations. The Klein Nadas Formation is a trimodal mass-flow fan consisting of thousands of huge, remobilised, end-Carboniferous Dwyka glacial boulders, many >3 m in length, set in an abundant, K-feldspar-rich and sandy matrix of fine gravel. Deluge rains over the smallest catchments deep within the northern Namib were the driving agent for the Klein Nadas Fan, the termination of which, with its contained boulders, rests on the coastal salt pans. These rains also resulted in catastrophic mass flows in several of the other northern Namib rivers. The Uniab Boulder Formation, being one, consists only of huge free-standing boulders. Gravelly fluvial deposition took place during global interglacial and glacial events. The Skeleton Coast Erg and other smaller dune trains blocked the rivers at times. The low-energy, thinly bedded silt deposits of the central and northern Namib are quite distinctive from the sands and gravels of older deposits. Their intermittent deposition is illustrated by bioturbation and pedogenesis of individual layers. Published offshore proxy climatological data (pollens, upwelling, wind, sea surface temperatures) point to expansion of the winter-rainfall regime of the southern Cape into southwestern Angola during strong glacial periods between the Upper Pleistocene and Holocene. In contrast to deposition initiated by short summer thunder storms, we contend that the silt successions are river-end accumulations within which each layer was deposited by runoff from comparatively gentle winter rains that lasted several days.

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8

Borg, G., K. Karner, M. Buxton, R. Armstrong, and S. W. v. d. Merwe. "Geology of the Skorpion Supergene Zinc Deposit, Southern Namibia." Economic Geology 98, no. 4 (June 1, 2003): 749–71. http://dx.doi.org/10.2113/gsecongeo.98.4.749.

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9

Cook, Robert B. "Connoisseur's Choice: Mimetite, Tsumeb, Namibia." Rocks & Minerals 76, no. 2 (March 2001): 114–17. http://dx.doi.org/10.1080/00357520109603204.

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10

Cook, Robert B. "Connoisseur's Choice: Smithsonite, Tsumeb, Namibia." Rocks & Minerals 75, no. 3 (May 2000): 176–79. http://dx.doi.org/10.1080/00357520009605637.

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11

Cook, Robert B. "Connoisseur's Choice: Dioptase, Tsumeb, Namibia." Rocks & Minerals 77, no. 3 (June 2002): 176–80. http://dx.doi.org/10.1080/00357529.2002.9926680.

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12

Pohwat, Paul W. "Connoisseur's Choice: Tennantite, Tsumeb, Namibia." Rocks & Minerals 86, no. 4 (June 30, 2011): 330–37. http://dx.doi.org/10.1080/00357529.2011.583601.

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13

Bowell, Robert J., and Janet H. Clifford. "Connoisseur's Choice: Leadhillite, Tsumeb, Namibia." Rocks & Minerals 89, no. 4 (June 5, 2014): 354–63. http://dx.doi.org/10.1080/00357529.2014.904665.

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14

Southwood, Malcolm. "Connoisseur's Choice: Ekatite, Tsumeb, Namibia." Rocks & Minerals 93, no. 6 (October 8, 2018): 524–27. http://dx.doi.org/10.1080/00357529.2018.1502581.

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15

Southwood, Malcolm. "Connoisseur's Choice: Minrecordite, Tsumeb, Namibia." Rocks & Minerals 95, no. 1 (November 26, 2019): 42–47. http://dx.doi.org/10.1080/00357529.2020.1670563.

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16

Cook, Robert B. "Connoisseur's Choice: Prehnite Brandberg, Namibia." Rocks & Minerals 74, no. 3 (January 1999): 178–80. http://dx.doi.org/10.1080/00357529909602536.

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17

Southwood, Malcolm. "Connoisseur's Choice: Alamosite, Tsumeb, Namibia." Rocks & Minerals 96, no. 2 (February 19, 2021): 158–63. http://dx.doi.org/10.1080/00357529.2021.1848218.

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18

Passchier, Cees W., and Ulrike Exner. "Digital mapping in structural geology — Examples from Namibia and Greece." Journal of the Geological Society of India 75, no. 1 (January 2010): 32–42. http://dx.doi.org/10.1007/s12594-010-0022-z.

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19

Ward, J. D. "Eolian, fluvial and pan (playa) facies of the Tertiary Tsondab Sandstone Formation in the central Namib Desert, Namibia." Sedimentary Geology 55, no. 1-2 (March 1988): 143–62. http://dx.doi.org/10.1016/0037-0738(88)90094-2.

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20

FRYBERGER, STEVEN G., PATRICK HESP, and KATHLEEN HASTINGS. "Aeolian granule ripple deposits, Namibia." Sedimentology 39, no. 2 (April 1992): 319–31. http://dx.doi.org/10.1111/j.1365-3091.1992.tb01041.x.

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21

Kaufman, A. J., L. Kriesfeld, P. Vickers-Rich, and G. Narbonne. "Cuando la vida anduvo errática: Un factor ambiental para la biomineralización de metazoos." Estudios Geológicos 75, no. 2 (November 18, 2019): 101. http://dx.doi.org/10.3989/egeol.43597.556.

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La repentina aparición de metazoos biomineralizados en las facies calcáreas del Miembro de Pockenbank (Namibia) parece reflejar un rápido cambio en el estado redox, la concentración de calcio y la alcalinidad del océano. La combinación de una importante innovación biológica con el final de una profunda excursión de isótopos de carbono respalda la idea de que la anomalía Shuram fue un fenómeno tectónico y oceanográfico, en contraposición a una “conspiración” diagenética mundial. La concordancia temporal de estos profundos acontecimientos, tal como se conservan en los estratos de Namibia meridional puede considerarse, por tanto, como marcadores geológicos excepcionales para la base del Ediacárico terminal.

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22

Reid, D. L., A. F. Cooper, D. C. Rex, and R. E. Harmer. "Timing of post–Karoo alkaline volcanism in southern Namibia." Geological Magazine 127, no. 5 (September 1990): 427–33. http://dx.doi.org/10.1017/s001675680001517x.

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AbstractNew radiometric age data are reported for alkaline centres in southern Namibia, and are discussed together with published age data in terms of models put forward to account for post-Karoo (Mesozoic–Recent) alkaline magmatism within the African plate. Agreement between K–Ar and Rb–Sr ages indicate emplacement of the Dicker Willem carbonatite in southern Namibia at 49 ± 1 Ma. Alkaline rocks associated with the Gross Brukkaros volcano show a discordant radiometric age pattern, but the best estimate for the age of this complex is 77 ± 2 Ma, similar to that obtained for the neighbouring Gibeon carbonatite-kimberlite province. The Dicker Willem carbonatite is therefore younger than the Luderitz alkaline province (133 ± 2 Ma), and the Gross Brukkaros volcano, but is older than the Klinghardt phonolite field (29–37 Ma). The new age data argue against a distinct periodicity in alkaline igneous activity in southern Africa, thereby ruling out possible controls by episodic marginal upwarping of the subcontinent. Although the available age data do not appear to be consistent with the passage of one or even two hotspots under southern Namibia, it is argued that the surface expression of hotspots under continents may be so large and overlapping that within-plate magmatism attributed to these thermal anomalies need not necessarily be confined to narrow linear belts or show an age progression. The role of hotspots in continental alkaline magmatism is most likely one of melt generation, while local crustal structure probably controls the distribution and timing of eruption. Major tectonic boundaries in the Precambrian basement underlying southern Namibia seem to have controlled the development of Tertiary alkaline centres in that region.

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23

Cook, Robert B. "Connoisseur's Choice: Spessartine Marienfluss, Northern Namibia." Rocks & Minerals 85, no. 1 (December 31, 2009): 50–59. http://dx.doi.org/10.1080/00357520903458194.

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24

Teller, James T., Nat Rutter, and N. Lancaster. "Sedimentology and paleohydrology of Late Quaternary lake deposits in the northern Namib Sand Sea, Namibia." Quaternary Science Reviews 9, no. 4 (January 1990): 343–64. http://dx.doi.org/10.1016/0277-3791(90)90027-8.

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25

Bowell, Rob, and Robert B. Cook. "Connoisseur's Choice: Shattuckite Kunene District Kaokoveld, Namibia." Rocks & Minerals 84, no. 6 (October 30, 2009): 544–50. http://dx.doi.org/10.1080/00357520903272231.

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26

Southwood, Malcolm, and James Robison. "Dolomite “Casts” and Epimorphs From Tsumeb, Namibia." Rocks & Minerals 91, no. 4 (June 23, 2016): 334–45. http://dx.doi.org/10.1080/00357529.2016.1172174.

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27

Cairncross, Bruce. "Connoisseur's Choice: Leiteite, Tsumeb Mine, Tsumeb, Namibia." Rocks & Minerals 92, no. 3 (April 11, 2017): 264–69. http://dx.doi.org/10.1080/00357529.2017.1283661.

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28

Cairncross, Bruce. "Minerals of Berg Aukas, Otavi Mountainland, Namibia." Rocks & Minerals 96, no. 2 (February 19, 2021): 110–47. http://dx.doi.org/10.1080/00357529.2021.1848216.

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29

Huizing, Terry E., and Anthony R. Kampf. "A Namibian Diamond Adventure." Rocks & Minerals 83, no. 6 (November 2008): 486–501. http://dx.doi.org/10.3200/rmin.83.6.486-501.

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30

Gower, C. F. "IGCP 418/440 Meeting, July-August 2002, Namibia." Gondwana Research 6, no. 2 (April 2003): 328–32. http://dx.doi.org/10.1016/s1342-937x(05)70983-7.

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31

Bowden, Peter, Judith A. Kinnaird, Michael Diehl, and Franco Pirajno. "Anorogenic granite evolution in Namibia—a fluid contribution." Geological Journal 25, no. 3-4 (July 1990): 381–90. http://dx.doi.org/10.1002/gj.3350250320.

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32

Cairncross, Bruce, and Uli Bahmann. "Minerals from the Goboboseb Mountains: Brandberg Region, Namibia." Rocks & Minerals 81, no. 6 (January 2006): 442–57. http://dx.doi.org/10.3200/rmin.81.6.442-457.

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33

Cairncross, Bruce. "Connoisseur's Choice: Tarbuttite, Skorpion Mine, Lüderitz District, Namibia." Rocks & Minerals 94, no. 2 (February 2019): 150–57. http://dx.doi.org/10.1080/00357529.2019.1530039.

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34

MOORE, J. M. "COMPARATIVE STUDY OF THE ONGANJA COPPER MINE, NAMIBIA: A LINK BETWEEN NEOPROTEROZOIC MESOTHERMAL CU(-AU) MINERALIZATION IN NAMIBIA AND ZAMBIA." South African Journal of Geology 113, no. 4 (December 1, 2010): 445–60. http://dx.doi.org/10.2113/gssajg.113.4.445.

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35

Day, Richard W., Alan J. Franzsen, and John Rogers. "Coast-parallel palaeochannels off southern Namibia." Marine Geology 105, no. 1-4 (March 1992): 299–304. http://dx.doi.org/10.1016/0025-3227(92)90195-n.

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36

Hartleb, J. W. O. "The Langer Heinrich uranium deposit: Southwest Africa/Namibia." Ore Geology Reviews 3, no. 1-3 (April 1988): 277–87. http://dx.doi.org/10.1016/0169-1368(88)90022-4.

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37

Prave, A. R., K. H. Hoffmann, W. Hegenberger, and A. E. Fallick. "Chapter 15 The Witvlei Group of East-Central Namibia." Geological Society, London, Memoirs 36, no. 1 (2011): 211–16. http://dx.doi.org/10.1144/m36.15.

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38

Cook, Robert B. "Connoisseur's Choice: Azurite: Tsumeb, Namibia, and Touissit, Oujda, Morocco." Rocks & Minerals 77, no. 1 (February 2002): 40–43. http://dx.doi.org/10.1080/00357529.2002.9926655.

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39

Cairncross, Bruce. "The Where of Mineral Names: Karibibite, Karibib District, Namibia." Rocks & Minerals 95, no. 2 (February 5, 2020): 174–79. http://dx.doi.org/10.1080/00357529.2019.1641030.

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40

Cairncross, Bruce. "Connoisseur's Choice: Nambulite, Kombat Mine, Grootfontein, Otjozondjupa Region, Namibia." Rocks & Minerals 95, no. 6 (October 21, 2020): 530–34. http://dx.doi.org/10.1080/00357529.2020.1791625.

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41

Cairncross, Bruce. "Connoisseur's Choice: Boltwoodite, Goanikontes Claim, Arandis, Erongo Region, Namibia." Rocks & Minerals 96, no. 3 (April 26, 2021): 238–47. http://dx.doi.org/10.1080/00357529.2021.1875746.

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42

Gray, Tim, Judith Kinnaird, Justin Laberge, and Alejandro Caballero. "Uraniferous Leucogranites in the Rössing Area, Namibia: New Insights from Geologic Mapping and Airborne Hyperspectral Imagery." Economic Geology 116, no. 6 (September 1, 2021): 1409–34. http://dx.doi.org/10.5382/econgeo.4828.

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Abstract This study combines historical exploration data with new mapping, underpinned by airborne hyperspectral imagery, to provide a detailed camp-scale geologic view of the Rössing uranium mine area in the Damara orogen, Namibia. The Neoproterozoic Damaran metasedimentary host rocks to uranium deposits of the Rössing area structurally overlie Paleoproterozoic basement rock. Both units were subjected to polyphase deformation and upper amphibolite to lower granulite facies metamorphism during Pan-African orogenesis. The sequence was voluminously intruded by leucogranites, where younger phases may contain ore-grade uranium as magmatic uraninite and traces of betafite, together with secondary uranium minerals. Early, postdepositional modifications to the Damaran sequence included partial dolomitization of marble units and development of evaporite dissolution and diapiric breccias. Major pre-D3 extensional structures developed in conjunction with recumbent, isoclinal folding and acted to focus the intrusion of early, mostly barren leucogranites generated primarily through anatexis of Damaran metasediments. Syn-D4 leucogranites overprint complex interference fold geometries that resulted from D3 deformation. D4 leucogranites were emplaced under predominantly ductile, transtensional conditions, into NNE-trending zones oriented highly oblique to all preexisting structures. These steeply dipping zones provided the prerequisite conditions for partial melt material to be derived from uraniferous basement lithologies. The concentration of magmatic uranium was promoted where leucogranite melt material interacted with carbonates and sulfide-bearing Damaran metasedimentary units. In the Rössing area these horizons occur at the Khan-Rössing Formation contact zone for the SJ, SK, SH, Z20, and Husab deposits and within and above the Arandis Formation for the Z19 deposit leucogranites.

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43

Reid, D. L. "Research on Proterozoic zinc deposits in Namibia and South Africa." South African Journal of Geology 108, no. 1 (March 1, 2005): 2. http://dx.doi.org/10.2113/108.1.2.

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44

Shore, Amy, Rachel Wood, Andrew Curtis, and Frederick Bowyer. "Multiple branching and attachment structures in cloudinomorphs, Nama Group, Namibia." Geology 48, no. 9 (May 29, 2020): 877–81. http://dx.doi.org/10.1130/g47447.1.

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Abstract The Ediacaran-Cambrian cloudinomorphs, which include Cloudina, are the first putative skeletal metazoans. They have a benthic ecology and tubular, organic, or biomineralized stacked funnel morphologies but an unresolved phylogenetic affinity. Rare dichotomous branching has been described in Cloudina, but here we demonstrate the presence of multiple (polytomous), dichotomous branching in cloudinomorphs from a microbial mat community from the Nama Group, Namibia, as revealed by three-dimensional models created from serial sections. Branches share an open, central cavity, and branching is achieved via external budding. These cloudinomorphs show attachment and mutual cementation to each other, and also to Namacalathus, via extratubular skeletal structures to potentially form a horizontal framework. Polytomous branching excludes a bilaterian affinity as proposed for other cloudinomorphs. This raises the possibility that the Ediacaran tubular, funnel morphology is convergent, and that cloudinomorphs may, in fact, represent taxa of diverse affinity.

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45

Chernova, T. G., and M. A. Levitan. "BITUMINOUS SUBSTANCES IN BOTTOM SEDIMENTS OF THE NAMIBIA CONTINENTAL MARGIN." International Geology Review 31, no. 9 (September 1989): 958–67. http://dx.doi.org/10.1080/00206818909465949.

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46

Cairncross, Bruce. "Connoisseur's Choice: Mimetite after Cerussite (Part 2), Tsumeb Mine, Namibia." Rocks & Minerals 96, no. 4 (June 24, 2021): 352–57. http://dx.doi.org/10.1080/00357529.2021.1901209.

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47

Jourdan, Paul. "The mineral economies of the SADCC: Namibia." Minerals & Energy - Raw Materials Report 7, no. 1 (January 1990): 6–17. http://dx.doi.org/10.1080/14041049009409940.

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48

Wanke, Heike, and Ansgar Wanke. "Lithostratigraphy of the Kalahari Group in northeastern Namibia." Journal of African Earth Sciences 48, no. 5 (August 2007): 314–28. http://dx.doi.org/10.1016/j.jafrearsci.2007.05.002.

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49

Kirkpatrick, Lynette H., and Andrew N. Green. "Antecedent geologic control on nearshore morphological development: The wave dominated, high sediment supply shoreface of southern Namibia." Marine Geology 403 (September 2018): 34–47. http://dx.doi.org/10.1016/j.margeo.2018.05.003.

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50

Le Roex, Anton P., Ronald T. Watkins, and Arch M. Reid. "Geochemical evolution of the Okenyenya sub-volcanic ring complex, northwestern Namibia." Geological Magazine 133, no. 06 (November 1996): 645. http://dx.doi.org/10.1017/s0016756800024523.

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