More information:

Hoal, B.G. 1989. Isotopic evolution of the Middle to Late Proterozoic Awasib Mountain terrain in southern Namibia. Precambrian Research, 45(1–3): 175–189


Description:

Isotopic evolution of the Middle to Late Proterozoic Awasib Mountain terrain in southern Namibia.

Summary / Notes:

The Middle to Late Proterozoic Awasib Mountain terrain (AMT) is situated at the approximate contact between the supracrustal Sinclair Sequence and the Namaqualand Metamorphic Complex in southern Namibia. Tholeiitic to alkaline metabasalts from the Kairab Metamorphic Complex, which forms part of the basement to the Sinclair Sequence in the AMT, yield an Rb-Sr isochron age of 1461 ± 169 Ma with an initial 87Sr/86Sr (R0) of 0.70269 ± 12. A preliminary Pb-Pb isochron age of 1467−215+201 Ma for these metabasalts appears to confirm the Rb-Sr age. These metabasalts have been intruded by the calc-alkaline Aunis tonalite gneiss which yields an Rb-Sr isochron age of 1271 ± 62 Ma and R0 of 0.7029 ± 3. The low R0 obtained for both of these basement units implies that the ages are primary and hence that the isotope systematics have not been disturbed by subsequent deformation and metamorphism. Andesitic and rhyolitic volcanics of the Haiber Flats Formation (HFF) are correlated with the Sinclair Sequence. Basaltic andesites from the HFF have shoshonitic affinities and may be classified as "medium- to high-K" and "orogenic" in character. One basaltic andesite unit yields an age of 1086 ± 44 Ma and R0 of 0.70305 ± 17, the low R0 indicating derivation from a mantle source region that is slightly depleted relative to a "bulk earth" or "uniform reservoir" composition. The errorchron age estimate of 1038 ± 74 Ma and R0 of 0.718 ± 15 obtained for a rhyolite porphyry from the HFF is within error of that deduced for the basaltic andesite. However, the high R0 of this largely ignimbritic unit is probably due to a significant component of melted crust. The younger, possibly subvolcanic, Awasib granite yields an errorchron with an apparent age of 934 ± 70 Ma and R0 of 0.719 ± 12. Scatter of these data may be attributed to compositional variation in a postulated crustal source. The A-type characteristics exhibited by both the HFF rhyolite and Awasib granite are compatible with their derivation by crustal anatexis. Available isotopic and geochemical data, together with field evidence, suggest an extensional palaeoenvironment for much of the AMT and Sinclair Sequence. While isotopic data alone are insufficient to establish the nature of the rifting, the broadly contemporaneous “Namaqua Orogeny” suggests that rifting may be collision-induced. Furthermore, the mantle source of abundant “orogenic” lavas in the AMT and Sinclair Sequence appears to owe its imprint of subduction-related metasomatism to a more ancient event.

Year: 1989

Type: Journal Article

URL: http://www.sciencedirect.com/science/article/pii/0301926889900387


Top 50 related results:

You may also be interested in the following items which are on a similar or related topic, listed in order of similarity.

Results per page:

Results: 1 to 50 of 50

To FILTER: Use the pale green row to filter the results on this page. Type in text or select from the year list.

Rows matching filter(s): All
What is this row? 
Data titleYearOriginFile typeDownloadkml/kmz
Burke, A. 2003. How special are Etendeka mesas? Flora and elevation gradients in an arid landscape in north-west Namibia. Journal of Arid Environments, 55(4): 747-764
  » More info & related results
2003 Journal Article
Hoal, B.G. 1989. Isotopic evolution of the Middle to Late Proterozoic Awasib Mountain terrain in southern Namibia. Precambrian Research, 45(1–3): 175–189
  » More info & related results
1989 Journal Article
Prendini, L. and Bird, T.L. 2008. Scorpions of the Brandberg Massif, Namibia: Species richness inversely correlated with altitude. African Invertebrates, 49(2): 77-107
  » More info & related results
2008 Journal Article2.55 mb pdf
Preview
Lotz, L.N. 2005. A new species of Cheiramiona (Araneae: Miturgidae) from Namibia. Researches of the National Museum, 21(2): 14-20
  » More info & related results
2005 Journal Article139 kb pdf
Preview
Anon. 1967. Solpugema aethiops sp.n. Scientific Papers of the Namib Desert Research Station, 1967(34): 5-9
  » More info & related results
1967 Journal Article380 kb pdf
Preview
Irish, J. 2002. Namibian Mountains: biodiversity potential based on topography, Windhoek
  » More info & related results
2002 Report
Wittneben, M. 2003. Vegetation of the Brandberg Mountain, Namibia.
  » More info & related results
2003 Thesis
Cunningham, P.L., Joubert, D.F. and Adank, W. 2004. Dodonaea angustifolia - an alien invasive to the Auas Mountains in Namibia? Dinteria, 29: 11-18
  » More info & related results
2004Namibia Scientific SocietyJournal Article972 kb pdf
Preview
Burke, A. 2003. Floristic relationships between inselbergs and mountain habitats in the central Namib. Dinteria, 28: 19-38
  » More info & related results
2003Namibia Scientific SocietyJournal Article281 kb pdf
Preview
Zimmermann, I. and Mwazi, F.N. 2002. The effect of a prescribed burn, followed up with browsing pressure, on rangeland condition in the Mountain savanna and Karstveld of Namibia. Dinteria, 27: 49-57
  » More info & related results
2002Namibia Scientific SocietyJournal Article183 kb pdf
Preview
Burke, A., Rügheimer, S., Nanyeni, L. and Klaassen, E. 2013. An annotated plant checklist of the southern Nubib Mountains (2516AA). Dinteria, 33(2-2): 66-76
  » More info & related results
2013Namibia Scientific SocietyJournal Article1.18 mb pdf
Preview
Burke, A. 2013. Succulent plants on arid inselbergs. Flora - Morphology, Distribution, Functional Ecology of Plants, 208(5–6): 321–329
  » More info & related results
2013 Journal Article
Matmon, A., Mushkin, A., Enzel, Y. and Grodek, T. 2013. Erosion of a granite inselberg, Gross Spitzkoppe, Namib Desert. Geomorphology, 201: 52–59
  » More info & related results
2013 Journal Article
Mountain Catchment Areas Act 63 of 1970
  » More info & related results
1970 Legal (Act, Gazette, Policy)73 kb pdf
Preview
Burke, A. 2005. A biodiversity treasure trove on Windhoek's doorstep. Flamingo, June 2005: 52-45
  » More info & related results
2005 Book, Book Section, Booklet2.35 mb pdf
Preview
Moisel, L. 1982. Wanderungen im Brandbergmassiv mit einem Nachtrag zur Pflanzenliste des Brandberges. Dinteria, 16: 21-26
  » More info & related results
1982Namibia Scientific SocietyJournal Article508 kb pdf
Preview
Giess, W. 1982. Weitere Neunachweise zur Flora des Brandberges. Dinteria, 16: 7-9
  » More info & related results
1982Namibia Scientific SocietyJournal Article307 kb pdf
Preview
Rutherford, M.C. 1972. Notes on the Flora and Vegetation of the Omuverume Plateau-Mountain, Waterberg, South West Africa. Dinteria, 8: 3-55
  » More info & related results
1972Namibia Scientific SocietyJournal Article34.79 mb pdf
Preview
Jankowitz, W.J. 1983. Die plantekologie van die Waterberg Platopark. PhD thesis, University of the Orange Free State, Bloemfontein
  » More info & related results
1983 Thesis
Nordenstam, B. 1982. The Brandberg revisited. Dinteria, 16: 3-5
  » More info & related results
1982Namibia Scientific SocietyJournal Article433 kb pdf
Preview
Rennie, J.V.L. 1935. On the flora of a high mountain in South-West Africa. Transactions of the Royal Society of South Africa, 23(3): 259-263
  » More info & related results
1935 Journal Article
van den Elzen, P. 1983. Zur Herpetofauna des Brandberges, Südwest-Afrika. Bonner zoologische Beiträge, 34(1-3): 293-309
  » More info & related results
1983 Journal Article1.47 mb pdf
Preview
Dâures – Biodiversity of the Brandberg Massif, Namibia. Biodiversity and Conservation, 11(3): 559-560
  » More info & related results
2002 Journal Article
Killian, J.W. 2000. Aerial survey of Wildlife on the Waterberg Plateau Park. September 2000. Ministry of Environmenta and Tourism, Directorate of Resource Management, Division of Specialist Support Services
  » More info & related results
2000 Report4.31 mb pdf
Preview
Ministry of Environment and Tourism. 1996. Concepts relating to a future management plan for the Greater Brandberg Area Erongo/Kunene Regions, Namibia, May 1996
  » More info & related results
1996 Report14.06 mb pdf
Preview
Brown, C.J. 1984. Birds of the Natal Alpine Belt. The Lammergeyer, 33: 1-13
  » More info & related results
1984 Journal Article686 kb pdf
Preview
Burke, A., Rügheimer, S. and Nanyeni, L. 2015. A plant checklist for the Bismarckberge in the central highlands of Namibia. Dinteria, 35: 3-12
  » More info & related results
2015 Journal Article325 kb pdf
Preview
Swanepoel, W., Van Jaarsveld, E., Voigt, W., Van Wyk, F. and Versfeld, F. 2009. The Otjihipa Mountains Expedition: botanical exploration in Namibia: Kaokoveld centre of endemism. Veld and Flora, 95(1): 12-18
  » More info & related results
2009 Journal Article
Simmons, R.E. 2001. A helicopter survey of Cape Vultures, Black Eagles and other cliff-nesting raptors around the Waterberg Plateau, Namibia. Lanioturdus, 34(3): 23-29
  » More info & related results
2001Bibliography compiled by Bird Database ProjectJournal Article451 kb pdf
Preview
Dürr, M.R. 2004. Sociable Weavers nesting on a cliff-face. Lanioturdus, 37(2): 19
  » More info & related results
2004 Journal Article136 kb pdf
Preview
Duffield-Harding, J. 1997. May field trip to Arbeid Adelt, Namib-Naukluft Mountains. Lanioturdus, 30(2): 24-27
  » More info & related results
1997 Journal Article258 kb pdf
Preview
Bridgeford, P.A. and Bridgeford, M. 1993. More birds of the Naukluft Mountains. Lanioturdus, 27: 64-66
  » More info & related results
1993 Journal Article225 kb pdf
Preview
Ludwiger, K.V. 1981. Kaffernadlerbeobachtungen von 1970-1980. Mitteilungen Ornithologische Arbeitsgruppe SWA Wissenschaftliche Gesellschaft, 17(1): 1-6
  » More info & related results
1981Bibliography compiled by Bird Database ProjectJournal Article422 kb pdf
Preview
Stein, A.B., Erckie, B., Fuller, T.K. and Marker, L.L. 2010. Camera trapping as a method for monitoring rhino populations within the Waterberg Plateau Park, Namibia. Pachyderm, 48: 67-70
  » More info & related results
2010 Journal Article641 kb pdf
Preview
Jankowitz, W.J. and Van Rensburg, W.L.J. 1985. Die basale bedekking en die weibare opbrengs van die sleutelgrasse en die dravermoe van die kruidstratum van die plantgemeenskappe in die Waterberg-platopark. Madoqua, 14(3): 305-313
  » More info & related results
1985 Journal Article640 kb pdf
Preview
Kirk-Spriggs, A.H. and Evenhuis, N.L. 2008. A new species of Psiloderoides Hesse (Diptera: Mythicomyiidae) from the Brandberg Massif, Namibia. African Entomology, 16(1): 122-126
  » More info & related results
2008 Journal Article
Wesolowska, W. 2006. Jumping spiders from the Brandberg massif in Namibia (Araneae: Salticidae). African Entomology, 14(2): 225-256
  » More info & related results
2006 Journal Article
Pirajno, F., Petzel, V.F.W. and Jacob, R.E. 1987. Geology and alteration-mineralization of the Brandberg West Sn-W deposit, Damara orogen, South West Africa/Namibia. South African Journal of Geology, 90(3): 256-269
  » More info & related results
1987 Journal Article817 kb pdf
Preview
van der Merwe, A. le R. 1969. Isolated homogeneous groups in nutritional studeis - report on a pilot survey on the Himba and Tjimba of the Bayness mountains. South African Medical Journal, 43(12): 331-332
  » More info & related results
1969 Journal Article1.74 mb pdf
Preview
Craven, P. and Craven, D. The flora of the Brandberg, Namibia
  » More info & related results
 Report287 kb pdf
Preview
Strohbach, B.J. 2017. Vegetation of the Auas-Oanob Conservancy in the Khomas Hochland of Namibia. Namibian Journal of Environment, 1(A): 14-33
  » More info & related results
2017 Journal Article7 mb pdf
Preview
Strohbach, B.J. 2017. Vegetation of the Auas-Oanob Conservancy in the Khomas Hochland of Namibia. Appendix 3: Vegetation of the Auas-Oanob Conservancy - Map. Namibian Journal of Environment, Appendix 3
  » More info & related results
2017 Journal Article35.17 mb pdf
Preview
Burke, A. 2017. Biodiversity zoning in the Greater Fish River Canyon Landscape in southern Namibia. Namibian Journal of Environment, 1(A): 60-71
  » More info & related results
2017 Journal Article3.37 mb pdf
Preview
Brown, C.J. 1987. The physical parameters of Cape Vultures in the Natal Drakensberg and some ideas on large size in mountain habitat. Vulture News, 18: 22-30
  » More info & related results
1987 Report261 kb pdf
Preview
Van Neer, M. and Breunig, P. 1999. Contribution to the archaeozoology of the Brandberg, Namibia. Cimbebasia, 15: 127-140
  » More info & related results
1999 Journal Article978 kb pdf
Preview
Picker, M.D. and Samways, M.J. 1996. Faunal diversity and endemicity of the Cape Peninsula, South Africa - A first assessment. Biodiversity and Conservation, 5: 591-606
  » More info & related results
1996 Journal Article4.84 mb pdf
Preview
Strohbach, B.J., Adank, W.F., Coetzee, M.E. and Jankowitz, W.J. 2019. A baseline description of the soils and vegetation of Farm Klein Boesman, Khomas Region, Namibia. Namibian Journal of Environment, 3(A): 37-55
  » More info & related results
2019 Journal Article3.12 mb pdf
Preview
Chase Grey, J.N., Kent, V.T. and Hill, R.A. 2013. Evidence of a high density population of harvested leopards in a montane environment. PLoS ONE, 8(12): e82832
  » More info & related results
2013 Journal Article666 kb PDF
Preview
Hoal, B. 1989. Proterozoic crustal evolution of the Awasib Mountain terrain, southern Namibia, with speical reference to the volcanic Haiber flats formation. PhD Thesis, University of Cape Town
  » More info & related results
1989 Thesis9.38 mb pdf
Preview
Zompro, O., Adis, J., Bragg, P.E., Naskrecki, P., Meakin, K., Wittneben, M. and Saxe, V. 2003. A new genus and species of Mantophasmatidae (Insecta: Mantophasmatodea) from the Brandberg Massif, Namibia, with notes on behaviour. Cimbebasia, 19: 13-24
  » More info & related results
2003 Journal Article684 kb pdf
Preview

» Links to useful free software for working with shapefiles, kml and kmz files, pdf files and more.