Turbidites in the Damara Orogen

  • H. Porada
  • R. Wittig
Conference paper


Three pre-orogenic turbidite sequences are developed in the north-east-trending branch of the Damara Orogen. They are all related to rift structures of the early Damaran “graben stage”.

The Chausib turbidite sequence (Chausib Member), 1500 m thick, is situated near the southern margin of the Damara Orogen. The turbidites are quartzitic in composition and are intercalated in biotite and graphite schist. They are derived from and partly interfinger with the Hakos Quartzite of the Hakos Formation.

The Tinkas turbidite sequence (Tinkas Member), 4000–5000 m thick, is exposed in a narrow zone, 300–350 km long, in the centre of the Damara Orogen. The calcareous (calc-silicate) Tinkas turbidites are genetically related to the northerly adjoining dolomites and limestones of the Karibib Formation and are intercalated in Kuiseb schist type metapelites and siltstones. The Tinkas Member grades upwards into and is partly coeval with the Kuiseb Formation. The spatial relationship between the source area and the basin, and the southward gradation of the Tinkas Member into the Kuiseb Formation suggest the existence of an extensive basin (“Khomas Trough”) towards the south. The Chausib turbidites in the southern Damara Orogen may have been deposited at the southern margin of this basin.

The Okonguarri turbidite sequence (Okonguarri Formation) occurs in the northern Damara Orogen and may be up to 4900 m thick. Two types of turbidites are developed: Calcareous turbidites which are clearly related to stromatolithic reefs and reef detritus of mainly the Okotjize Formation; and siliceous turbidites which are probably derived from Nosib type deposits. The calcareous turbidites have been transported episodically from a northern slope into the Okonguarri basin and are concentrated in nine “dolomite zones”. The siliceous turbidites are derived from the east and have been transported along the axis of the basin.

Geodynamically, the development of the rapidly subsiding turbidite depositories mark the change from a mature graben or continental rift environment to the initial stage of a more general subsidence.


Turbidity Current Differential Subsidence Biotite Schist Turbidite Sequence Turbidite Layer 
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  1. Blaine, J.L. (1977) Tevolution of the Waldau Ridge structure and the Okahandly Lineament in part of the central Damara Orogen, west of Okahandja, South West Africa. Bull. Precam. Res. Unit, Univ. Cape Town, 21, 99 pp.Google Scholar
  2. Clifford, T.N. (1967) The Damaran Episode in the Upper Proterozoic - Lower Paleozoic structural history of Southern Africa. Geol. Soc. America Spec. Paper, 92, 100 pp.Google Scholar
  3. Gevers, T.W. (1931a) The Fundamental Complex of western Damaraland, South West Africa. D. Sc. Thesis (unpubl.), Univ. Cape Town.Google Scholar
  4. Gevers, T.W. (1931b) An ancient tillite in South West Africa. Trans. Geol. Soc. S. Afr., 34, 1–17.Google Scholar
  5. Guj, P. (1970) The Damara mobile belt in the south-western Kaokoveld, South West Africa. Bull. Precam. Res. Unit, Univ. Cape Town, 8, 168 pp.Google Scholar
  6. Guj, P. (1974) A revision of the Damara stratigraphy along the southern margin of the Kamanjab Inlier, Outjo District, South West Africa. In: A. Kroner (Editor), Contributions to the Precambrian Geology of Southern Africa: A volume in honour of John de Villiers. Bull. Precam. Res. Unit, Univ. Cape Town, 15, 167–176.Google Scholar
  7. Halbich, I.W. (1977) Structure and tectonics along the southern margin of the Damara Mobile Belt, South West Africa. Annal. Univ. Stellenbosch, Ser. A 1 (Geology), 2, 149–247.Google Scholar
  8. Hedberg, R.M. (1979) Stratigraphy of the Ovamboland basin, South West Africa. Bull. Precam. Res. Unit, Univ. Cape Town, 24, 325 pp.Google Scholar
  9. Jacob, R.E. (1974) Geology and metamorphic petrology of part of the Damara Orogen along the lower Swakop River, South West Africa. Bull. Precam. Res. Unit, Univ. Cape Town, 17, 185 pp.Google Scholar
  10. Kroner, A. (1981) Rb/Sr geochronology and tectonic evolution of the Pan-African Damara Belt of Namibia, southwestern Africa. Amer. J. Sci., in press.Google Scholar
  11. Martin, H., Porada, H. (1977) The intracratonic branch of the Damara Orogen in South West Africa. I. Discussion of geodynamic models. Prcam. Res., 5, 311–338.CrossRefGoogle Scholar
  12. Martin, H., Porada, H., Walliser, O.H. (in preparation) Mixtite deposits of the Damara sequence, Namibia. Problems of interpretation: The case for a non-glacial origin.Google Scholar
  13. Miller, R.McG. (1972) The geology of a portion of southern Damaraland, South West Africa, with particular reference to the petrogenesis of the Salem Granite. Ph. D. thesis (unpubl.), Univ. Cape Town, 246 pp.Google Scholar
  14. Miller, R.McG. (1979) The Okahandja Lineament, a fundamental tectonic boundary in the Damara Orogen of South West Africa/Namibia. Trans. Geol. Soc. S. Afr., 82, 349–361.Google Scholar
  15. Porada, H. (1973) Tektonisches Verhalten und geologische Bedeutung von Kalksilikatfels-Lagen und -Spindeln im Damara-Orogen Südwest-Afrikas. Geol. Rdsch., 62, 918–938.CrossRefGoogle Scholar
  16. Porada, H. (1982) Geodynamic and geosynclinal development of the Damara Orogen, Namibia/South West Africa. This volume.Google Scholar
  17. Porada, H., Wittig, R. (1975) Zur Tektonik des südlichen Damara-Belts. Rep. Sonderforschungsbereich 48 (unpubl.), Univ. Göttingen, 51–70.Google Scholar
  18. Porada, H., Wittig, R. (1976) Das Chausib-Turbiditbecken am Südrand des Damara-Orogens, Südwest-Afrika. Geol. Rdsch., 65, 1002–1019.CrossRefGoogle Scholar
  19. Porada, H., Wittig, R. (1977) Die Entwicklung der basalen Damara-Folge am Abbabis Inlier (Südwest Afrika) und Überlegungen zur Geodynamik dieses Bereichs. N. Jb. Geol. Paläont. Mh. 8, 475–502.Google Scholar
  20. Porada, H., Wittig, R. (1982) Turbidites and their significance for the geosynclinal evolution of the Damara Orogen. In: R. McG. Miller, ed., Geodynamic evolution of The Damara Orogen. Geol. Soc. S. Afr., Spec. Publ., in press.Google Scholar
  21. Sawyer, E.W. (1978) Damaran structural and metamorphic geology of an area south-east of Walvis Bay, South West Africa/Namibia. M. Sc. thesis (unpubl.), Univ. Cape Town, 205 pp.Google Scholar
  22. Sclater, J.G., Christie, P.A.F. (1980) Continental stretching: an explanation of the post mid-Cretaceous subsidence of the central North Sea basin. J. Geophys. Res., 85 (B7), 3711–3739.CrossRefGoogle Scholar
  23. Walker, R.G. (1978) Deep-Water Sandstone Facies and Ancient Submarine Fans: Models for Exploration for Stratigraphic Traps. Bull. Am. Ass. Petrol. Geol., 62, 932–966.Google Scholar
  24. Ziegler, P.A. (1978) North Sea rift and basin development. In: I.B. Ramberg and E.R. Neumann (Editors), Tectonics and Geophysics of Continental Rifts, 249–277.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1983

Authors and Affiliations

  • H. Porada
    • 1
  • R. Wittig
    • 1
  1. 1.Geologisch-Paläontologisches InstitutGöttingenGermany

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