Gravity modeling Bushveld complex connectivity supported by Southern African Seismic Experiment results

South African Journal of Geology

Volumn 107, Issue 1-2, 2004, Pages 207-218

  Webb, Susan J ^a   Cawthorn, R Grant ^a   Nguuri, Teresia ^a,b   James, David ^c  

^a UNIVERSITY OF THE WITWATERSRAND   (South Africa)

^b INTERNATIONAL ATOMIC ENERGY AGENCY   (Austria)

^c GEOPHYSICAL LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

BUSHVELD COMPLEX; CONNECTIVITY; GRAVITY ANOMALY; MODELING; SEISMIC SURVEY;

AFRICA; BUSHVELD COMPLEX; SOUTH AFRICA; SOUTHERN AFRICA; SUB-SAHARAN AFRICA;

EID: 4444275831     PISSN: 10120750     EISSN: None     Source Type: Journal    
DOI: 10.2113/107.1-2.207     Document Type: Article

References (48)

1. Ashwal, L.D., Webb, S.J., and Knoper, M.W. (2003). Cyclicity in layered intrusions as revealed by near-continuous geophysical and petrologic measurements in the Bushveld Complex, South Africa, EGS-AGU-EUG Joint Assembly, Volume 5: Nice, France, Geophysical Research Abstracts, 03223.
2. Biesheuvel, K. (1970). An interpretation of a gravimetric survey in the area west of Pilanesberg in the western Transvaal. Geological Society of South Africa, Special Publication, 1, 266-282.
3. Buchmann, J.P. (1960). Exploration of a geophysical anomaly at Trompsburg, Orange Free State, South Africa. Transactions of the Geological Society of South Africa, 63, 1-10.
4. Campbell, G. (1990). The seismic revolution in gold and platinum prospecting. South African Geophysical Association Yearbook, 1, 37-45.
5. Cawthorn, R.G. (1998). Geometrical relations between the Transvaal Supergroups, the Rooiberg Group and the mafic rocks of the Bushveld Complex. South African Journal of Geology, 101, 275-279.
6. Cawthorn, R.G., and Spies, L. (2003). Plagioclase content of cyclic units in the Bushveld complex, South Africa. Contributions to Mineralogy and Petrology, 145, 47-60.
7. Cawthorn, R.G., and Webb, S.J. (2001). Connectivity between the western and eastern limbs of the Bushveld Complex. Tectonophysics, 330, 95-209.
8. Cawthorn, R.G., Cooper, G.R.J., and Webb, S.J. (1998). Connectivity between the western and eastern limbs of the Bushveld Complex. South African Journal of Geology, 101, 291-298.
9. Christensen, N.I., and Mooney, W.D. (1995). Seismic velocity structure and composition of the continental crust: A global view. Journal of Geophysical Research, 100, 9761-9788.
10. Cousins, C.A. (1959). The structure of the mafic portion of the Bushveld Igneous Complex. Transactions of the Geological Society of South Africa, 62, 79-189.
11. Darracott, B.W. (1974). Standardization of the gravity datum in South Africa. Annual of the Geological Survey of South Africa, 10, 15-117.
12. Davison, G.E., and Chunnett, G.K. (1999). Seismic exploration for Merensky Reef: The way ahead. South African Journal of Geology, 102, 261-267.
13. Dueker, K. G., and Sheehan, A. F. (1997). Mantle discontinuity structure from mid-point stacks of converted P to S waves across the Yellowstone Hotspot Track. Journal of Geophysical Research, 102, 8313-8327.
14. Dueker, K. G. and Sheehan, A. F. (1998). Mantle discontinuity structure beneath the Colorado Rocky Mountain and High Plains. Journal of Geophysical Research, 103, 7153-7169.
15. Du Plessis, A., and Kleywegt, R.J. (1987). A dipping sheet model for the mafic lobes of the Bushveld Complex. South African Journal of Geology, 90, 1-6.
16. du Toit, A.L. (1954). The Geology of South Africa. Oliver and Boyd, Edinburgb, U.K., 539pp.
17. Eglington, B. M., and Armstrong, R. A. (2004). Geochronological database for Achaean and Proterozoic components of the Kaapvaal Craton and adjacent orogens. South African Journal of Geology, 107, 13-32.
18. Frick, C., and Walraven, F. (1985). The petrology and geochemistry of the pre-Karoo Elandskraal volcano, South Africa. Transactions of the Geological Society of South Africa, 88, 225-243.
19. Gordon-Welsh, J.F., Kleywegt, R.J., Venter, C.P., Du Plessis, A., Beukes, J.H.T., and Du Plessis, J.G. (1986). Regional gravity surveys by the Geological Survey Data acquision, reduction and presentation. Annals of the Geological Survey of South Africa, 20, 59-68.
20. Gurrola, H., Minster, J. B., and Owens, T. J. (1994). The use of velocity spectrum for stacking receiver functions and imaging upper mantle discontinuities. Geophysical Journal International, 120, 537-543.
21. Hales, A.L., and Gough, D.I. (1960). Isostatic anomalies and crustal structure in the Southern Cape. Geophysics Journal, 3, 225-236.
22. Hall, A.L. (1932). The Bushveld Igneous Complex of the central Transvaal. South African Geological Survey Memoir, 28, Pretoria, 560 pp.
23. Hartzer, F. J. (1995). Transvaal Supergroup inliers: geology, tectonic development and relationship with the Bushveld Complex, South Africa. Journal of African Earth Science, 21, 521-547.
24. James, D.E., Boyd, F.R., Schutt, D., Bell, D.R., and Carlson, R.W. (2004). Xenolith constraints on seismic velocities in the upper mantle beneath southern Africa: Geochemistry, Geophysics, Geosystems, 5 Q01002, doi:10.1029/2003GC000551.
25. Maccelari, M.J., Kruger, F.J., and Durrheim, R.J. (1991a). The interpretation of a reflection seismic profile across the western lobe of the Bushveld Complex. South African Geophysical Association, 2nd Biennial Meeting, 122.
26. Maccelari, M.J., Sutherland, R.A., and Durrheim, R.J. (1991b). The processing of a reflection seismic profile recorded across the western lobe of the Bushveld Complex. South African Geophysical Association, 2nd Biennial Meeting, 123-126.
27. Maier, W. D., Peltonen, P., Grantham, G., and Mänttäri, I. (2003). A new 1.9 Ga age for the Trompsburg intrusion, South Africa, Earth and Planetary Science Letters, 212, 315-360.
28. Maré, L.P., Oosthuizen, B.C., and Tabane, L.R. (2002). Physical Properties of South African Rocks, South African Geophysical Atlas, Council for Geoscience, South Africa, IV, 37 pp.
29. Meyer, R., and De Beer, J.H. (1987). Structure of the Bushveld Complex from resistivity measurements. Nature, 325, 610-612.
30. Molyneux, T.G., and Klinkert, P.S. (1978). A structural interpretation of part of the eastern mafic lobe of the Bushveld Complex and its surrounds. Transactions of the Geological Society of South Africa, 81, 359-368.
31. Nguuri, T.K., Gore, J., James, D.E., Webb, S.J., Wright, C., Zengeni, T.G., Gwavava, O., Snoke, J.A., and Group, K.S. (2001). Crustal structure beneath southern Africa and its implications for the formation and evolution of the Kaapvaal and Zimbabwe cratons. Geophysical Research Letters, 28, 2501-2504.
32. Odgers, A.T.R., and du Plessis, A. (1993). Interpretation of a regional reflection seismic survey in the north-eastern Bushveld Complex. South African Geophysical Association Third Biennial Meeting, 125-129.
33. Odgers, A.T.R., Hinds, R.C., and Von Gruenwaldt, G. (1993). Interpretation of a seismic reflection survey across the Southern Bushveld Complex. South African Journal of Geology, 96, 205-212.
34. Ortlepp, R.J. (1959). A pre-Karroo igneous complex at Trompsburg, Orange Free State, revealed by drilling exploration. Transactions of the Geological Society Society of South Africa, 62, 33-57.
35. Sargeant, F. (2001). The Seismic Stratigraphy of the Bushveld Igneous Complex, South Africa. PhD. Thesis, University of Liverpool, England, 424 pp.
36. Schmitz, M.D., and Bowring, S.A. (2003). Ultra high-temperature metamorphism in the lower crust during Neoarchean Ventersdorp rifting and magmatism, Kaapvaal Craton, southern Africa. Geological Society of America Bulletin, 115, 533-548.
37. Sharpe, M.R., Bahat, D., and Von Gruenewaldt, G. (1981). The concentric elliptical feeder sites to the Bushveld Complex and possible economic implications. Transactions of the Geological Society of South Africa, 84, 239-244.
38. Smit, P.J. (1962). The gravity survey of the Republic of South Africa. Handbook 3, Part I: Gravimeter Observations. Government Printer, Pretoria, 486 pp.
39. Tankard, A.J., Jackson, M.P.A., Eriksson, K.A., Hobday, D.K., Hunter, D.R., and Minter, W.E.L. (1982). Crustal evolution of Southern Africa: 3.8 billion years of Earth history. Springer-Verlag, New York, U.S.A., 523 pp.
40. Tinker, J., de Wit, M., and Grotzinger, J. (2002). Seismic stratigraphic constraints on Neoarchean - Paleoproterozoic evolution of the western margin of the Kaapvaal Craton, South Africa. South African Journal of Geology, 105, 107-134.
41. Uken, R., and Watkeys, M.K. (1997). Diapirism initiated by the Bushveld Complex, South Africa. Geology, 25, 723-726.
42. van der Merwe, M.J. (1976). The layered sequence of the Potgietersrus limb of the Bushveld Complex. Economic Geology, 71, 1337-1351.
43. Venter, C.P., Du Plessis, J.G., Stettler, R.H., Potgieter, T.D., Kleywegt, R.J., Hattingh, E., Fourie, C.J.S., Wolmarans, L.G., Cloete, A.H., and Maré, L.P., (1999). Gravity. South African Geophysical Atlas, Council for Geoscience, South Africa, 1, 74 pp.
44. Walraven, F. (1987). Geochronological and isotopic studies of Bushveld Complex rocks from the Fairfield borehole at Moloto, northeast of Pretoria. South African Journal of Geology, 90, 352-360.
45. Walraven, F., and Darracott, B.W. (1976). Quantitative interpretation of a gravity profile across the western Bushveld Complex. Transaction of the Geological Society of South Africa, 79, 22-26.
46. Watts, A.B. (2001). Isostasy and Flexure of the Lithosphere. Cambridge University Press, Cambridge, U.K., 458 pp.
47. Wessel, P., and Smith, W. H. F. (1991). Free software helps map and display data. EOS, 72, 445-446.
48. Wollard, G. P. (1959). Crustal structure from gravity and seismic measurements. Journal of Geophysical Research, 64, 1521-1544.