Dating the shock wave and thermal imprint of the giant Vredefort impact, South Africa

Geology

Volumn 25, Issue 1, 1997, Pages 7-10

  Moser, D E ^a  

^a DEPARTMENT OF NATURAL HISTORY   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

BINARY ALLOYS; GEOCHRONOLOGY; HYDRAULIC STRUCTURES; LEAD ALLOYS; LEVEES; PHOSPHATE MINERALS; SILICATE MINERALS; STRUCTURAL GEOLOGY; URANIUM ALLOYS; ZIRCON;

ASTEROID COLLISION; COMBINED HEATING; DECOMPRESSION MELTING; IGNEOUS ACTIVITY; IMPACT STRUCTURES; METAMORPHIC EVENTS; THERMAL IMPRINT; U-PB GEOCHRONOLOGY;

SHOCK WAVES;

ASTEROID; GEOCHRONOLOGY; SHOCK WAVE; TERTIARY; URANIUM-LEAD DATING; ZIRCON; IMPACT EVENT; MAGMATISM; PROTEROZOIC; SHOCK METAMORPHISM; THERMAL IMPRINT; URANIUM/LEAD DATING;

FREE STATE; SOUTH AFRICA; VREDEFORT DOME; VREDEFORT STRUCTURE;

EID: 0030756818     PISSN: 00917613     EISSN: None     Source Type: Journal    
DOI: 10.1130/0091-7613(1997)025<0007:DTSWAT>2.3.CO;2     Document Type: Article

References (25)

1. Bisschoff, A. A., 1982, Thermal metamorphism in the Vredefort Dome: Geological Society of South Africa Transactions, v. 85, p. 43-57.
2. Bohor, B. F., Betterton, W. J., and Krogh, T. E., 1993, Impact-shocked zircons: Discovery of shock-induced textures reflecting increasing degrees of shock metamorphism: Earth and Planetary Science Letters, v. 119, p. 419-424.
3. de Wit, M.J., and 8 others., 1992, Formation of an Archean continent: Nature, v. 357, p. 553-562.
4. Faggart, B. E., Jr., Basu, A. R., and Tatsumoto, M., 1985, Origin of the Sudbury complex by meteorite impact: Neodymium isotopic evidence: Science, v. 230, p. 436-439.
5. French, B. M., and Nielsen, R. L., 1990, Vredefort bronzite granophyre: Chemical evidence of origin as a meteorite impact melt: Tectonophysics, v. 171, p. 119-138.
6. Gibson, R. L., and Wallmach, T., 1995, Low pressure-high temperature metamorphism in the Vredefort Dome, South Africa: Anticlockwise pressure-temperature path followed by rapid decompression: Geological Journal, v. 30, p. 319-331.
7. Green, D. H., 1972, Archean greenstone belts may include equivalents of lunar mare?: Earth and Planetary Science Letters, v. 15, p. 263-270.
8. Grieve, R. F., 1980, Impact bombardment and its role in proto-continental growth on the early Earth: Precambrian Research, v. 10, p. 217-247.
9. Grieve, R. F., Coderre, J. M., Robertson, P. B., and Alexopoulos, J., 1990, Microscopic planar deformation features in quartz of the Vredefort structure: Anomalous but still suggestive of an impact origin: Tectonophysics, v. 171, p. 185-200.
10. Hart, R. J., Welke, H. J., and Nicolaysen, L. O., 1981, Geochronology of the deep profile through Archean basement at Vredefort, with implications for early crustal evolution: Journal of Geophysical Research, v. 86, p. 10663-10680.
11. Hart, R. J., Andreoli, M. A. G., Tredoux, M., and de Wit, M. J., 1990, Geochemistry across an exposed section of Archean crust at Vredefort, South Africa: With implications for mid-crustal discontinuities: Chemical Geology, v. 82, p. 21-50.
12. Hart, R. J., Andreoli, M. A. G., Reimold, W. U., and Tredoux, M., 1991a, Aspects of the dynamic and thermal metamorphic history of the Vredefort cryptoexplosion structure: Implications for its origin: Tectonophysics, v. 192, p. 313-331.
13. Hart, R. J., Andreoli, M. A. G., Smith, C. B., Otter, M. L., and Durrheim, R., 1991b, Ultramafic rocks in the centre of the Vredefort structure (South Africa): Possible exposure of the upper mantle: Chemical Geology, v. 83, p. 233-248.
14. Kamo, S. L., Reimold, W. U., Krogh, T. E., and Colliston, W. P., in press, A 2.023 Ga age for the Vredefort impact event and a first report of shock metamorphosed zircons from pseudotachylitic breccia and granophyre: Earth and Planetary Science Letters.
15. Krogh, T. E., 1993, High precision U-Pb ages for granulite metamorphism and deformation in the Archean Kapuskasing Structural Zone, Ontario: Implications for the structure and development of the lower crust: Earth and Planetary Science Letters, v. 119, p. 1-18.
16. Krogh, T. E., Kamo, S. L., and Bohor, B. F., 1996, Shock metamorphosed zircons with correlated U-Pb discordance and melt rocks with concordant protolith ages indicate an impact origin for the Sudbury structure, in Basu, A., and Hart, S., eds., Earth processes: Reading the isotopic code: American Geophysical Union Monograph 96, p. 343-353.
17. McCarthy, T. S., Stanistreet, I. G., and Robb, L. J., 1990, Geological studies related to the origin of the Witwatersrand Basin and its mineralization: An introduction and a strategy for research and exploration: South African Journal of Geology, v. 93, p. 1-4.
18. Pupin, J. P., 1980, Zircon and granite petrology: Contributions to Mineralogy and Petrology, v. 73, p. 207-220.
19. Schreyer, W., 1983, Metamorphism and fluid inclusions in the basement of the Vredefort Dome, South Africa: Guidelines to the origin of the structure: Journal of Petrology, v. 24, p. 26-47.
20. Slawson, W. F., 1976, Vredefort core: A cross-section of the upper crust?: Geochimica et Cosmochimica Acta, v. 40, p. 117-121.
21. Spray, J. G., Kelley, S. P., and Reimold, W. U., 1995, Laser probe argon-40/argon-39 dating of coesite and stishovite-bearing pseudotachylytes and the age of the Vredefort impact event: Meteoritics, v. 30, p. 335-343.
22. Stacey, J. S., and Kramers, J. D., 1975, Approximation of terrestrial lead isotope evolution by a two-stage model: Earth and Planetary Science Letters, v. 26, p. 207-221.
23. Stepto, D., 1990, The geology and gravity field in the central core of the Vredefort structure: Tectonophysics, v. 171, p. 75-103.
24. Therriault, A. M., Reid, A. M., and Reimold, W. U., 1993, Original size of the Vredefort Structure, South Africa [abs.]: Lunar and Planetary Science, v. 24, p. 1419-1420.
25. Walraven, F., Armstrong, R. A., and Kruger, F. J., 1990, A chronostratigraphic framework for the north-central Kaapvaal craton, Bushveld Complex and the Vredefort structure: Tectonophysics, v. 171, p. 23-48.