Integrated geophysical modelling of a giant, complex impact structure: Anatomy of the Vredefort Structure, South Africa

Tectonophysics

Volumn 287, Issue 1-4, 1998, Pages 1-20

  Henkel, Herbert ^a   Reimold, Wolf Uwe ^b  

^a ROYAL INSTITUTE OF TECHNOLOGY   (Sweden)

^b UNIVERSITY OF THE WITWATERSRAND   (South Africa)

Author keywords

Geophysical modelling; Gravity; Impact structure; Magnetics; Seismics; Vredefort structure; Witwatersrand Basin

Indexed keywords

GEOPHYSICAL MODELLING; IMPACT STRUCTURE;

SOUTH AFRICA, FREE STATE, VREDEFORT STRUCTURE;

EID: 0031867994     PISSN: 00401951     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-1951(98)80058-9     Document Type: Article

References (35)

1. Ahrens, T.J., O'Keefe, J.D., 1977. Equations of state and impact induced shock-wave attenuation on the Moon. In: Roddy, D.J., Pepin, R.O., Merrill, R.B. (Eds.), Impact and Explosion Cratering. Pergamon Press, New York, pp. 639-656.
2. Duane, M.J., Kruger, F.J., 1991. Geochronological evidence for tectonically driven brine migration during the Early Proterozoic Kheis Orogeny of Southern Africa. Geophys. Res. Lett. 18, 975-978.
3. Durrheim, R.J., Green, R.W.E., 1992. A seismic refraction investigation of the Archaean Kaapvaal craton, South Africa, using mine tremors as the energy source. Geophys. J. Int. 108, 812-832.
4. Durrheim, R.J., Nicolaysen, L.O., Corner, B., 1991. A deep seismic reflection profile across the Archaean-Proterozoic Witwatersrand basin, South Africa. Continental lithosphere: Deep seismic reflections. AGU, Geodyn. Ser. 22, 213-224.
5. Fletcher, P., Reimold, W.U., 1989. Some notes and speculations on the pseudotachylites in the Witwatersrand Basin and the Vredefort Dome. S. Afr. J. Geol. 92, 223-234.
6. Friese, A.E.W., Charlesworth, E.G., McCarthy, T.S., 1996. Tectonic processes within the Kaapvaal Craton during the Kibaran (Grenville) orogeny: Structural, geophysical and isotopic constraints from the Witwatersrand Basin and environs. Econ. Geol. Res. Unit, Univ. of the Witwatersrand, Johannesburg, Inf. Circ. 292, 67 pp.
7. Geovista, 1994. GMM gravity and magnetic modelling, Users Manual. Geovista AB, Luleå, 41 pp.
8. Gibson, R.L., Armstrong, R.A., Reimold, W.U., 1997. The age and thermal evolution of the Vredefort impact structure: A single-grain U-Pb zircon study. Geochim. Cosmochim. Acta 61, 1531-1540.
9. Green, R.W., Chetty, P., 1990. Seismic refraction studies in the basement of the Vredefort structure. Tectonophysics 171, 105-113.
10. Grieve, R.A.F., Coderre, J.M., Robertson, P.B., Alexopoulos, J., 1990. Microscopic planar deformation features in quartz of the Vredefort structure: Anomalous but still suggestive of an impact origin. Tectonophysics 171, 185-200.
11. Grieve, R.A.F., Rupert, J., Smith, J., Therriault, A.M., 1995. The record of terrestrial impact cratering. GSA Today 5, 193-196.
12. Hart, R.J., Andreoli, M.A.G., Smith, C.B., Otter, M.L., Durrheim, R.J., 1990. Ultramafic rocks in the centre of the Vredefort structure: possible exposure of the upper mantle. Chem. Geol. 83, 233-248.
13. Hart, R.J., Andreoli, M.A.G., Reimold, W.U., Tredoux, M., 1991. Aspects of the dynamic and thermal metamorphic history of the Vredefort cryptoexplosion structure: implications for its origin. Tectonophysics 192, 313-331.
14. Hart, R.J., Hargraves, R.B., Andreoli, M.A.G., Tredoux, M., Doucouré, C.M., 1995. Magnetic anomaly near the centre of the Vredefort structure: Implications for impact related magnetic signatures. Geology 23, 277-280.
15. Henkel, H., 1992. Geophysical aspects of meteorite impact craters in eroded shield environment, with special emphasis on electric conductivity. Tectonophysics 216, 63-89.
16. Henkel, H., 1997. The magnetism of impact structures. Meteoritics Planet. Sci. 32, 292.
17. Henkel, H., Reimold, W.U., 1996. Integrated gravity and magnetic modelling of the Vredefort impact structure - reinterpretation of the Witwatersrand Basin as the erosional remnant of an impact basin. Econ. Geol. Res. Unit, Univ. of the Witwatersrand, Johannesburg, Inf. Circ. 299, 89 pp.
18. Henkel, H., Reimold, W.U., 1997. Integrated gravity and magnetic modelling of the Vredefort impact structure -reinter-pretation of the Witwatersrand basin as the erosional remnant of an impact basin (2nd ed.). Royal Inst. of Technology, Stockholm, TRITA GEOFOTO 14, 90 pp.
19. Henkel, H., Lee, M.K., Lund, C.-E., 1990. An integrated geophysical interpretation of the 2000 km Fennolora section of the Baltic Shield. In: Freeman, R., Giese, P., Müller, St. (Eds.), The European Geotraverse: Integrated Studies. European Science Foundation, Strasbourg, pp. 67-76.
20. Hjelmquist, S., 1966. Beskrivning till berggrundskarta över Kopparbergs län. Geol. Surv. Sweden, Ser. Ca 40.
21. Jackson, G.M., 1982. Palaeomagnetic Study and Magnetic Modelling of the Vredefort Dome. B.Sc. Hons. Thesis, Dep. of Geophys., Univ. of the Witwatersrand, Johannesburg, 46 pp.
22. Juhlin, C., 1991. Scientific summary report of the Deep Gas Drilling Project in the Siljan Ring impact structure. Vattenfall Utvecklings AB, Älvkarleby, Rep. U(G) 1991/14, 278 pp.
23. Juhlin, C., Pedersen, L.B., 1987. Reflection seismic investigations of the Siljan impact structure, Sweden. J. Geophys. Res. 92 (B13), 14113-14122.
24. Kamo, S.L., Reimold, W.U., Krogh, T.E., Colliston, W.P., 1996. A 2.023 Ga age for the Vredefort impact event and a first report of shock metamorphosed zircons in pseudotachylitic breccias and Granophyre. Earth Planet. Sci. Lett. 144, 369-388.
25. Koeberl, C., Reimold, W.U., Shirey, S.B., 1996. A Re-Os isotope study of the Vredefort Granophyre: Clues to the origin of the Vredefort Structure, South Africa. Geology 24, 913-916.
26. Leroux, H., Reimold, W.U., Doukhan, J.-C., 1994. A T.E.M. investigation of shock metamorphism in quartz from the Vredefort dome, South Africa. Tectonophysics 230, 223-239.
27. Melosh, H.J., 1989. Impact Cratering - A Geologic Process. Oxford Monogr. Geol. Geophys. 11, 245 pp.
28. Moser, D.E., 1997. Dating the shock wave and thermal imprint of the giant Vredefort impact, South Africa. Geology 25, 7-10.
29. Nel, L.T., 1927. The geology of the country around Vredefort. Geol. Surv. S. Afr. Spec. Publ. 6, 134 pp.
30. Reimold, W.U., 1990. The controversial microdeformations in quartz from the Vredefort structure, South Africa. S. Afr. J. Geol. 93, 645-663.
31. Reimold, W.U., Gibson, R.L., 1996. Geology and evolution of the Vredefort impact structure, South Africa. J. Afr. Earth Sci. 23, 125-162.
32. Reimold, W.U., Meshik, A.P., Smit, G., Pravditseva, O.V., Shukolyukov, Yu.A., 1995. Fission Xenon dating of Witwatersrand uraninite: Implications for geological activity in the Central Kaapvaal Craton about 1 Ga ago. Geochim. Cosmochim. Acta 59, 5177-5190.
33. Stevens, G., Gibson, R.L., Droop, G.T.R., 1997. Mid-crustal granulite facies metamorphism in the Vredefort Dome: The Bushveld Complex connection. Precambrian Res. 82, 113-132.
34. Therriault, A.M., Reimold, W.U., Reid, A.M., 1996. The Vredefort Granophyre: Field studies. S. Afr. J. Geol. 99, 1-21.
35. Therriault, A.M., Grieve, R.A.F., Reimold, W.U., 1997. Original size of the Vredefort Structure: Implications for the geological evolution of the Witwatersrand Basin. Meteoritics Planet. Sci. 32, 71-77.