Morpho-tectonics and mechanism of emplacement of the dolerite rings and sills of the western Karoo, South Africa

South African Journal of Geology

Volumn 102, Issue 1, 1999, Pages 43-54

  Chevallier, L ^a   Woodford, A ^b,c  

^a Western Cape Regional Office   (South Africa)

^b DEPARTMENT OF WATER AFFAIRS AND FORESTRY   (South Africa)

^c Toens and Partners Consulting   (South Africa)

Author keywords

[No Author keywords available]

Indexed keywords

DOLERITE; EMPLACEMENT; RING COMPLEX; SILL; TECTONICS;

SOUTH AFRICA;

EID: 0033102413     PISSN: 10120750     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (34)

1. Bradley, J. (1965). Occurrence and origin of ring-shaped dolerite outcrops in the Eastern Cape Province and Western Transkei. Trans. R. Soc. N. Z. (Geol.), 3, 27-55.
2. Bristow, J.W. and Saggerson, E.P. (1983). A review of Karoo vulcanicity in Southern Africa. Bull. Volcanol., 46, 135-159.
3. Burger, C.A.J., Hodgson, F.D.I. and Van der Linde, P.J. (1981). Hidroliese eienskappe van akwifere in die Suid-Vrystaat. Die ontwikkeling en evaluering van tegnieke vir die bepaling van die ontginninspotensiaal van grondwaterbronne in die Suid-Vrystaat en in Noord-Kaapland. Inst. Groundwater Stud., Univ. Orange Free State, Bloemfontein, South Africa, 2, 115 pp.
4. Duncan, R.A., Hooper, P.R., Ehacek, J., Marsh, J.S. and Duncan, R.A. (1997). The timing and duration of the Karoo igneous event, Southern Gondwana. J. Geophys. Res., 102, 18 127-18 138.
5. Du Toit, A.L. (1905). Geological survey of Glen Grey and parts of Queenstown and Woodehouse, including the Indwe area. A. Rep. Geol. Commn. Cape of Good Hope, 10, 95-140.
6. Du Toit, A.L. (1920). The Karoo dolentes - a study in hypabyssal intrusion. Trans. Geol. Soc. S. Afr., 23, 1-42.
7. Eales, H.V., Marsh, J.S. and Cox, K.G. (1984). The Karoo Igneous Province: An introduction. In: Erlank, A.J. (Ed.), Petrogenesis of the Volcanic Rocks of the Karoo Province. Spec. Publ. Geol. Soc. S. Afr., Johannesburg, South Africa, 13, 1-26.
8. Ernst, R.E. (1990). Magma flow directions in two mafic Proterozoic dyke swarms of the Canadian Shield: As estimated using anisotropy of magnetic susceptibility data. In: Parker, A.J., Rickwood, P.C. and Tucker, D.H. (Eds.), Mafic Dykes and Emplacement Mechanisms. Proc. 2nd int. Dyke Conf., A.A. Balkema, Rotterdam, 231-236.
9. Ernst, R.E and Buchan, K.L. (1997a). Giant radiating dyke swarms and the identification of pre-Mesozoic large igneous provinces and mantle plumes. In: Mahoney, J.J. and Coffin, M.F. (Eds.), Large Igneous Provinces: Continental, Oceanic and Planetary Flood Volcanism. Am. Geophys. Un., Geophys. Monogr, 100, 297-333.
10. Ernst, R.E. and Buchan, K.L. (1997b). Layered mafic intrusions: a model for their feeder systems and relationship with giant dyke swarms and mantle plume centres. S. Afr. J. Geol., 100, 319-334.
11. Gibbs, A.K. (1987). Contrasting styles of continental mafic intrusions in the Guiana shield. In: Halls, H.C. and Fahrig, W.F. (Eds.), Mafic Dyke Swarms. Proc. Int. Conf., Toronto, Can., Spec. Pap. Geol. Assoc. Can., 34, 457-466.
12. Halls, H.C. and Bates, M.P. (1990). The evolution of the 2.45 Ga Matatchewan Dyke Swarm, Cananda. In: Parker, A.J., Rickwood, P.C. and Tucker, D.H. (Eds.), Mafic Dykes and Emplacement Mechanisms. A.A. Balkema, Rotterdam, 237-250.
13. Hunter, D.R. and Reid, D.L. (1987). Mafic dyke swarms in southern Africa. In: Hall, H.C. and Fahrig, W.F. (Eds.), Mafic Dyke Swarms. Proc. Int. Conf, Toronto, Spec. Pap. Geol. Assoc. Can., 34, 445-456.
14. Johnson, A.M. and Pollard, D.D. (1973) Mechanics of growth of some laccolithic intrusions in the Henry Mountains, Utah, I. Field observations, Gilbert's model, physical properties and flow of the magma. Tectonophysics, 18, 261-309.
15. Le Roex, A.P. and Reid, D.L. (1978). Geochemistry of Karoo dolerite sills in the Calvinia District, Western Cape Province, South Africa. Contrib. Mineral. Petrol., 66, 351-360.
16. Lombaard, B.V. (1952). Karoo dolerites and lavas. Trans. Geol. Soc. S. Afr., 55, 175-198.
17. Marsh, J.S. and Eales, H.V. (1984). The chemistry and petrogenesis of igneous rocks of the Karoo Central area, Southern Africa. In: Erlank, A.J. (Ed.), Petrogenesis of the Volcanic Rocks of the Karoo Province. Spec. Publ. Geol. Soc. S. Afr, Johannesburg, South Africa, 13, 27-68.
18. Marsh, J.S., Hooper, P.R., Rehacek, J., Duncan, R.A. and Duncan, A.R. (1997). Stratigraphy and age of Karoo basalts of Lesotho and implications for correlations within the Karoo igneous Province. In: Mahoney, J. and Coffin, M. (Eds.), Large Igneous Provinces: Continental, Oceanic and Planetary Flood Volcanism. Am. Geoph. Un., Geophys. Monogr., 100, 247-272.
19. McLaren, C.H. and Visser, J.N.J. (1978). Karoo dolerite between Plooysburg and Belmont, Northern Cape Province. Ann. Geol. Surv. S. Afr., 11, 49-58.
20. Meyboom, A.F. and Wallace, R.C. (1978). Occurrence and origin of ring-shaped dolerite outcrops in the Eastern Cape Province and Western Transkei. Trans. Geol. Soc. S. Afr., 81, 95-99.
21. Pollard, D.D. and Johnson, A.M. (1973). Mechanics of growth of some laccolithic intrusions in the Henry Mountains, Utah, II. Bending and failure of overburden layers and sill formation. Tectonophysics, 18, 311-354.
22. Reid, D.L. and Rex, D.C. (1994). Cretaceous dykes associated with the opening of the South Atlantic: the Mehlberg dyke, Northern Richtersfeld. S. Afr J. Geol., 97, 135-145.
23. Reid, D.L., Erlank, A.J. and Rex, D.C. (1991). Age and correlation of the False Bay dolerite dyke swarm, south western Cape, Cape Province. S. Afr. J. Geol., 94, 155-158.
24. Rogers, A.W. and Du Toit, A.L. (1903). Geological survey of parts of the divisions of Ceres, Sutherland and Calvinia. A. Rep. Cape Geol. Comm., 36-43.
25. Rogers, A.W. and Schwarz, E.H.L. (1902). Report on parts of the divisions of Beaufort West, Prince Albert and Sutherland. A. Rep. Cape Geol. Comm., 97-128.
26. Scholtz, D.L. (1936). The magmatic nikeliferous ore deposits of East Griqualand and Pondoland. Trans. Geol. Soc. S. Afr., 39, 210 pp + 37 plates.
27. Sylvester, A.G. (1988). Strike-slip faults. Bull. Geol. Soc. Am., 100, 1666-1703.
28. Vivier, J.J.P., Van der Voort, I. and Botha, J.F. (1995). The analysis and interpretation of aquifer tests in secondary aquifers: The influence of geology on the geohydrology of Karoo aquifers. Unpubl. Rep. Inst. Groundwater Stud., Univ. Orange Free State, Bloemfontein, South Africa, 115 pp.
29. Walker, F. and Poldervaart, A. (1941). The Karoo dolerites of the Calvinia District. Trans. Geol. Soc. S. Afr., 44, 127-148.
30. Walker, F. and Poldervaart, A. (1942). Petrology of the Karoo Dolerites between Sutherland and Middelburg, C.P. Trans. Geol. Soc. S. Afr., 45, 55-64.
31. Walker, F. and Poldervaart, A. (1949). Karoo dolerites of the Union of South Africa. Bull. Geol. Soc. Am., 60, 591-706.
32. White, R.S. (1997). Mantle plume origin for the Karoo and Ventersdorp flood basalts, South Africa. S. Afr. J. Geol., 100, 271-282.
33. Wilke, P.P. (1961). The structural, stratigraphic and lithological control of underground water distribution in the Fraserburg District, C.P. M.Sc. thesis (unpubl.), Stellenbosch Univ., South Africa, ?? pp.
34. Winter, H. de la R. and Venter, J.J. (1970). Lithostratigraphic correlation of recent deep boreholes in the Karoo-Cape sequence. In: Haughton, S.H. (Ed.), Proc. Pap., 2nd IUGS symp., CSIR publ., Pretoria, 395-408.